NSMutableArray gets reset after calling modalViewController - objective-c

IT IS SOLVED BY #T-X. I've marked the changes with "// SOLUTION" in the code!!!
I have the following issue, if I presentModalViewController, the NSMutableArray "projectsArray" gets reset.
Here is my code:
Here the .h file:
// ViewController.h
#import <UIKit/UIKit.h>
#class AddProject;
#interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
IBOutlet UITableView *projectsTableView;
UIAlertView *reallyDelete;
BOOL candelButtonClicked;
NSIndexPath *actualIndexPath;
NSMutableArray *projectsArray;
NSInteger ID;
NSString *NAME;
AddProject *addProject;
**ViewController *viewContr; // SOLUTION**
}
- (IBAction)addNewProject:(id)sender;
- (void)addToTableView:(NSString *)projectName;
#property (nonatomic, retain) UIAlertView *reallyDelete;
#property (nonatomic) NSInteger cancelButtonIndex;
#property IBOutlet UITableView *projectsTableView;
#property (nonatomic, retain) AddProject *addProject;
**#property (nonatomic, retain) ViewController *viewContr; // SOLUTION**
#end
Here the .m file:
// ViewController.m
#import "ViewController.h"
#import "CustomTableCell.h"
#import "AddProject.h"
#interface ViewController ()
#end
#implementation ViewController
**#synthesize viewContr; // SOLUTION**
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
projectsArray = [[NSMutableArray alloc] init];
ViewController *element = [[ViewController alloc] init];
element->ID = 1;
element->NAME = #"Demo project";
NSLog(#"viewdidload");
[projectsArray addObject:element];
NSLog(#"1. Array length: %d", [projectsArray count]);
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if ([projectsArray count] < 1) {
NSLog(#"2. Array length: 0");
return 0;
} else {
NSLog(#"2. Array length: %d", [projectsArray count]);
return [projectsArray count];
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 78;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *customTableCellIdentifier = #"CustomTableCell";
CustomTableCell *cell = (CustomTableCell *)[tableView dequeueReusableCellWithIdentifier:customTableCellIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"CustomTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
ViewController *element = [[ViewController alloc] init];
element = [projectsArray objectAtIndex:indexPath.row];
cell.nameLabel.text = element->NAME;
cell.prepTimeLabel.text = [NSString stringWithFormat:#"%i", element->ID];
NSLog(#"3. Array length: %d", [projectsArray count]);
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
reallyDelete = [[UIAlertView alloc] initWithTitle:#"Deleting" message:#"Do your really want to delete that row?" delegate:self cancelButtonTitle:#"No" otherButtonTitles:#"Yes", nil];
[reallyDelete show];
actualIndexPath = indexPath;
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex != [reallyDelete cancelButtonIndex])
{
//If "Yes" clicked delete
[projectsArray removeObjectAtIndex:actualIndexPath.row];
NSLog(#"delete row");
[self.projectsTableView deleteRowsAtIndexPaths:[NSMutableArray arrayWithObjects:actualIndexPath, nil] withRowAnimation:YES];
[self.projectsTableView reloadData];
}
}
#pragma mark Edit
- (IBAction)addNewProject:(id)sender {
NSLog(#"4. Array length: %d", [projectsArray count]);
AddProject *addProjectView = [[AddProject alloc] initWithNibName:#"AddProject" bundle:nil];
NSLog(#"4.1 Array length: %d", [projectsArray count]);
addProjectView.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
NSLog(#"4.2 Array length: %d", [projectsArray count]);
addProjectView.modalPresentationStyle = UIModalPresentationFormSheet;
NSLog(#"4.3 Array length: %d", [projectsArray count]);
**addProjectView.viewContr = self; // SOLUTION**
[self presentModalViewController:addProjectView animated:YES];
NSLog(#"4.4 Array length: %d", [projectsArray count]);
addProjectView.view.superview.frame = CGRectMake(addProjectView.view.center.x/2.5, addProjectView.view.center.y/3, 800, 600);
NSLog(#"4.5 Array length: %d", [projectsArray count]);
}
- (void)addToTableView:(NSString *)projectName
{
NSLog(#"Project Array: %#", projectsArray);
NSLog(#"addToTableView: %#", projectName);
NSLog(#"5. Array length: %d", [projectsArray count]);
ViewController *element = [[ViewController alloc] init];
element->ID = 2;
element->NAME = projectName;
[projectsArray addObject:element];
NSLog(#"6. Array length: %d", [projectsArray count]);
[self.projectsTableView reloadData];
[self.projectsTableView setNeedsDisplay];
}
- (void)viewDidUnload
{
[self setProjectsTableView:nil];
self.projectsTableView = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
#end
Here the .h file of the modal presented view:
// AddProject.h
#import <UIKit/UIKit.h>
#class ViewController;
#interface AddProject : UIViewController
{
IBOutlet UITextField *projectName;
ViewController *viewContr;
}
- (IBAction)back:(id)sender;
- (IBAction)next:(id)sender;
#property (nonatomic, retain) ViewController *viewContr;
#end
The .m file of the modal presented file:
// AddProject.m
#import "AddProject.h"
#import "ViewController.h"
#interface AddProject ()
#end
#implementation AddProject
**#synthesize viewContr; // SOLUTION I've mist to synthesize it**
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
**// SOLUTION no new allocation/init of ViewController**
}
- (IBAction)back:(id)sender
{
[self dismissModalViewControllerAnimated:YES];
}
- (IBAction)next:(id)sender
{
[viewContr addToTableView:projectName.text];
[viewContr.projectsTableView reloadData];
[viewContr.projectsTableView setNeedsDisplay];
[self dismissModalViewControllerAnimated:YES];
}
- (void)viewDidUnload
{
projectName = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
#end
I've tested the code by using breakpoints and I could locate the issue when the AddProject class "viewDidLoad" starts loading. But I don't know why it resets the array.

You navigate from ViewController Screen to Add project Screen. In Add Project Screen, you add a new project and want to delegate back this information to the ViewController Screen where you came from.
Now, you are trying to have an instance of ViewController in your AddProject, which you newly instantiate in viewDidLoad method and when project is added, you provide the information to it by calling - (void)addToTableView:(NSString *)projectName on it.
This doesn't work because - The instance of ViewController you allocated is a new instance and not the one you navigated from. When you do alloc + init you get a new object. Thus, although you get addToTableView: called on your ViewController, it doesn't work because the ViewController instance that is receiving this message is a new instance and not the one you navigated from.
Thus, all you needed to do is - have a ViewController property in your Add Project, which you would set before navigating. And then you can send message to this property - As explained in this transcript.
I would like to say - However this thing works, it provides tight coupling between the two controllers.
Ideally, This cane be done by making ViewController (where you go navigate from) as a delegate of Add Project (where you navigate to). And then Add Project can delegate the added project to it's delegate by something like - (void) addProjectController:(AddProjectViewController *) controller didAddProject:(NSString *) projectName. This provides lose coupling between the two view controllers. To understand delegation concept, refer to Delegates and Datasources. Alternatively, search for other Stack overflow posts.

You should allocate projectsArray in the init method of the view controller, not in in viewDidLoad. projectsArray = [[NSMutableArray alloc] init]; allocated a new empty array tach time the view is loaded.

Okay my issue is fixed through the stackoverflow chat. The tips for the final solution came from user #T-X. I've added the tips in the code in my question. They are marked with "// SOLUTION".
In Add Project View controller's viewDidLoad method, remove the line
viewContr = [[ViewController alloc] init];. Now make the variable
viewContr in your ViewController class a property. Also synthesize
it. And finally in the - (IBAction)addNewProject:(id)sender method,
before presenting the controller, do - addProjectView.viewContr = self;. It will solve your issue.
(quote from chat.stackoverflow | #T-X)

Related

Can't import NSMutableArray to another class, and save tablecell objects

I have an app that is tableview/pickerview controlled and for each table i have filled with textcellobjects.
Now when customer chooses one row and continue to next tableview I want to save that object in an NSMutableArray that is allocated/initialized in one class and I want to have that class file public so objects can be added from all the different tableview classes into the NSMutableArray.
The first 2 files MotorTVController code is working well, when a tableview cell is clicked the object is added to _myTrimArray, but I want to be able to save next tablecell object in the same _myTrimArray, i try to import the TrimArray.h(2 files last in the code here) with the same save function to MotorTVController to use the savearraycode from it, but is is not working.
So I want TrimArray.h/TrimArray.h to be able to save from all the different classes with tableviews and tableviewcell text values into one NSMutableArray.
I have been struggling with this for almost a week now, I hope someone can give me a solution, I'm kinda new at this, I know this cant be so difficult to solve, but I just don't know how?
//--------- MotorTVController.h
#import "YearPickerTVControllerPolaris.h"
#import "MotorTVController.h"
#import "motorTVCell.h"
#import "brandsTVCell.h"
#import "TrimArray.h"
#interface MotorTVController : YearPickerTVControllerPolaris
#property (nonatomic, strong) NSArray *motorLabelArray;
#property (nonatomic, strong) NSMutableArray *myTrimArray;
#end
//--------- MotorTVController.m file:
#import "MotorTVController.h"
#import "motorTVCell.h"
#import "YearPickerTVControllerPolaris.h"
#import "BackButton.h"
#import "TrimArray.h"
#interface MotorTVController ()
#end
#implementation MotorTVController
#synthesize myTrimArray = _myTrimArray;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
// Getter
- (NSMutableArray *)myTrimArray
{
if (_myTrimArray == nil) {
_myTrimArray = [[NSMutableArray alloc] init];
}
return _myTrimArray;
}
- (void)viewDidLoad
{
UIImage *arrow = [UIImage imageNamed:#"backbutton"];
UIButton *arrowButton = [[UIButton alloc] initWithFrame:CGRectMake(-12, 0, 36, 36)];
[arrowButton setBackgroundImage:arrow forState:UIControlStateNormal];
[arrowButton addTarget:self action:#selector(back)
forControlEvents:UIControlEventTouchUpInside];
UIView* buttonView = [[UIView alloc] initWithFrame:CGRectMake(-12, 0, 36, 36)];
[buttonView addSubview:arrowButton];
UIBarButtonItem * backbutton = [[UIBarButtonItem alloc]
initWithCustomView:buttonView];
[self.navigationItem setLeftBarButtonItem:backbutton];
[super viewDidLoad];
_motorLabelArray = #[#"Original EH12 (4hk)",
#"Honda GX160 (5.5hk)",
#"Subaru EX17 (6hk)",
#"Honda GX200 (6.5hk)",
#"Briggs LO206 (9hk)",
#"Briggs WF206 (11HK)"];
//NSLog(#"%#", _myTrimArray);
}
-(void)back
{
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _motorLabelArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:
(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"motorTVCell";
motorTVCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier
forIndexPath:indexPath];
// Configure the cell...
[cell setTintColor:[UIColor blackColor]];
[cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
[cell setAccessoryType:UITableViewCellAccessoryDetailButton];
NSInteger row = [indexPath row];
cell.motorCellLabel.text = _motorLabelArray[row];
return cell;
}
// Which row is selected
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:
(NSIndexPath *)indexPath
{
NSInteger rowNumber = indexPath.row;
if (rowNumber == 0)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:0]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:0]);
}
else if (rowNumber == 1)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:1]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:1]);
}
else if (rowNumber == 2)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:2]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:2]);
}
else if (rowNumber == 3)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:3]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:3]);
}
else if (rowNumber == 4)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:4]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:4]);
}
else if (rowNumber == 5)
{
[_myTrimArray addObject:[_motorLabelArray objectAtIndex:5]];
NSLog(#"You choosed %#", [_myTrimArray objectAtIndex:5]);
}
}
#end
//-------------- TrimArray.m
#import "TrimArray.h"
#import "MotorTVController.h"
#interface TrimArray ()
#end
#implementation TrimArray
#synthesize myTrimArray = _myTrimArray;
// Getter
- (NSMutableArray *)myTrimArray
{
if (_myTrimArray == nil) {
_myTrimArray = [[NSMutableArray alloc] initWithCapacity:10];
}
return _myTrimArray;
}
#end
//----------------- TrimArray.h:
#import "MotorTVController.h"
#interface TrimArray : NSMutableArray
#property (nonatomic, strong) NSMutableArray *myTrimArray;
#end
If I understood right your question , you want an arrayObject to be available globally for all the other ViewControllers right ?
If so ,your subclassing form NSMutableArray and give it Property of NSMutableArray is Wrong.
To achieve this , the simplest solution would be to use NSUserDefaults.
To sore the ArrayObject Like below.
// Get the standardUserDefaults object, store your UITableView data array against a key, synchronize the defaults
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
[userDefaults setObject:_trimArray forKey:#"TrimArray"];
[userDefaults synchronize];
To retrieve // you can retrieve the arrayObject from anywhere in your app.
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSArray *arrayOfObjects = [userDefaults objectForKey:#"TrimArray"];
// Use 'yourArray' to repopulate your UITableView

Detail View from TableView, Parsing

Can someone please help me, I looked everywhere to figure this out and nothing worked so far. I need to pass some data from table view to detail view and stick it into labels and Uiimage.
Data tableview is pulling comes from Parse database I created and seems to get pulled fine into the Tableview but I would like to use the same array that tableview is using for its data to fill out the detail view.
I am using 2 columns from parse to fill out this tableview Title and sub, and another tow columns to fill out the label and image. Here is my code so far. There is a bunch of variables that i was using in this code in DetailView
.h
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface BooksTableViewController : UITableViewController <UITableViewDelegate,NSObject >
{
NSArray * Booksarray;
}
#property (strong, nonatomic) IBOutlet UITableView *bookstableview;
#end
.m
#import "BooksTableViewController.h"
#import "BookDetailViewController.h"
#interface BooksTableViewController ()
#end
#implementation BooksTableViewController
#synthesize bookstableview;
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self performSelector:#selector(RetrieveDatafromParse)];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
-(void) RetrieveDatafromParse {
PFQuery * getbooks = [PFQuery queryWithClassName:#"BooksTableView"];
[getbooks findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if(!error) {
Booksarray =[[NSArray alloc] initWithArray: objects];
}
[bookstableview reloadData];
NSLog(#"%#",objects);
}];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return Booksarray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * CellIdentifier = #"Cell";
UITableViewCell * cell = [bookstableview dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell ==nil) {
cell = [[ UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
}
PFObject * tempObject = [Booksarray objectAtIndex:indexPath.row];
cell.textLabel.text = [tempObject objectForKey:#"Books"];
cell.detailTextLabel.text= [tempObject objectForKey:#"Code"];
return cell;
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
BookDetailViewController * detailVC=[[BookDetailViewController alloc] initWithNibName:#"BookDetailViewController" bundle:nil];
detailVC.BookImage.image=[Booksarray objectAtIndex:indexPath.row];
detailVC.bookDesc.text=[Booksarray objectAtIndex:indexPath.row];
detailVC.bookTitle.text=[Booksarray objectAtIndex:indexPath.row];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.destinationViewController isKindOfClass: [BookDetailViewController class]]) {
BookDetailViewController *destination = segue.destinationViewController;
SEL selector = NSSelectorFromString(#"SetFile:");
if ([destination respondsToSelector:selector]) {
NSIndexPath *indexPath = [self.bookstableview indexPathForCell:sender];
PFObject * object = [Booksarray objectAtIndex:indexPath.row];
PFFile *file = [object objectForKey:#"BooksTableView"];
[destination setValue:file forKey:#"file"];
}
}
}
#end
.h
#import <UIKit/UIKit.h>
#import <Parse/Parse.h>
#interface BookDetailViewController : UIViewController <NSObject> {
}
#property (weak, nonatomic) IBOutlet UIImageView *BookImage;
#property (weak, nonatomic) IBOutlet UILabel *bookTitle;
#property (weak, nonatomic) IBOutlet UILabel *bookDesc;
#property (weak,nonatomic)PFFile *file;
#end
.m
#import "BookDetailViewController.h"
#import "BooksTableViewController.h"
#interface BookDetailViewController ()
#implementation BookDetailViewController
#synthesize BookImage,bookTitle,bookDesc,file,bookInfo,Picture,object2;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self performSelector:#selector(RetrieveObjectsFromParse)];
self.bookTitle.text = [self.file objectForKey:#"Books"];
self.BookImage.image = [self.file objectForKey:#"BookImage"];
self.bookDesc.text =[self.file objectForKey:#"BookDetails"];
}
-(void)RetrieveObjectsFromParse {
PFQuery * GetObjects = [PFQuery queryWithClassName:#"BooksTableView"];
[GetObjects findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if(!error) {
details =[[NSArray alloc] initWithArray: objects];
};
NSLog(#"%#",objects);
}];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#end
Try this:
#1 create a segue from controller to controller:
#2 Give your segue an Id for example detailSegue.
#3 Perform the segue in didSelectRowAtIndexPath:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[self performSegueWithIdentifier:#"detailSegue" sender:sender];
}
#4 Implement the segue delegate:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
// Make sure your segue name in storyboard is the same as this line
if([segue.identifier isEqualToString:#"detailSegue"]){
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
BookDetailViewController *detailVC = (BookDetailViewController *)segue.destinationViewController;
detailVC.bookDesc.text=[Booksarray objectAtIndex:indexPath.row];
//I uncommented that because it looks like a typo, same value 3 times?
//detailVC.BookImage.image=[Booksarray objectAtIndex:indexPath.row];
//detailVC.bookTitle.text=[Booksarray objectAtIndex:indexPath.row];
}
}
If this is the log you get:
2014-03-21 15:06:20.151 BookStore[25539:90b]
BookIndex= { BookDetails = "Test
test"; BookImage = ""; Books = Languages; Code =
104; }
Then you need to do it like this instead:
detailVC.bookTitle.text=[[Booksarray objectAtIndex:indexPath.row]objectForKey:#"Books"];
detailVC.bookDesc.text= [[Booksarray objectAtIndex:indexPath.row]objectForKey:#"BookDetails"];
detailVC.BookImage.image=[[Booksarray objectAtIndex:indexPath.row]objectForKey:#"BookImage"];
Or to make it shorter:
NSArray *bookAtIndex = [Booksarray objectAtIndex:indexPath.row];
detailVC.bookTitle.text=[bookAtIndex objectForKey:#"Books"];
detailVC.bookDesc.text= [bookAtIndex objectForKey:#"BookDetails"];
detailVC.BookImage.image=[bookAtIndex objectForKey:#"BookImage"];
or even shorter
NSArray *bookAtIndex = Booksarray[indexPath.row];
detailVC.bookTitle.text= bookAtIndex[#"Books"];
detailVC.bookDesc.text= bookAtIndex[#"BookDetails"];
detailVC.BookImage.image= bookAtIndex[#"BookImage"];

Create a UIPageViewController with a UITableView in each page

I have been reading things on stack overflow for quite a while now but this is my first post, only because it is the first time I have a problem that no one else seems to have fixed yet!
Ok, down to business. It should be a simple matter to put UITableViews inside a UIPageView but I am having difficulties. I have a ViewController and contentViewController. I am using .xibs instead of storyboarding. The contentViewController.xib is a Table View and the ViewController.xib is a View. I am only focusing on iPhone. The UITableView is connected to dataSource, delegate, and Referencing Outlet named theTableView.
The project builds but when I run it I get the following error message:
2013-03-17 16:14:23.026 pageApp[775:c07] *** Assertion failure in -[UITableView layoutSublayersOfLayer:], /SourceCache/UIKit_Sim/UIKit-2380.17/UIView.m:5776
2013-03-17 16:14:23.028 pageApp[775:c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Auto Layout still required after executing -layoutSubviews. UITableView's implementation of -layoutSubviews needs to call super.'
*** First throw call stack:
(0x1c93012 0x10d0e7e 0x1c92e78 0xb66665 0x6539f 0x10e46b0 0x228ffc0 0x228433c 0x228feaf 0x1042bd 0x4cb56 0x4b66f 0x4b589 0x4a7e4 0x4a61e 0x4b3d9 0x4e2d2 0xf899c 0x45574 0x4576f 0x45905 0x4e917 0x20eb 0x12157 0x12747 0x1394b 0x24cb5 0x25beb 0x17698 0x1beedf9 0x1beead0 0x1c08bf5 0x1c08962 0x1c39bb6 0x1c38f44 0x1c38e1b 0x1317a 0x14ffc 0x1d2d 0x1c55)
libc++abi.dylib: terminate called throwing an exception
This crashes after -(void)viewDidLoad{} in ViewController.m and I have not yet learned how to fix auto layout/ layoutSubview errors. Does anyone else know how?
I have limited experience with ios development so I am sure that I just don't have the right pieces in the right spots. I used http://www.techotopia.com/index.php/An_Example_iOS_5_iPhone_UIPageViewController_Application to get this far.
My code is as follows:
ViewController.h
#import <UIKit/UIKit.h>
#import "contentViewController.h"
#interface ViewController : UIViewController
<UIPageViewControllerDataSource>
{
UIPageViewController *pageController;
NSArray *pageContent;
}
#property (strong, nonatomic) UIPageViewController *pageController;
#property (strong, nonatomic) NSArray *pageContent;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize pageController, pageContent;
- (contentViewController *)viewControllerAtIndex:(NSUInteger)index
{
// Return the data view controller for the given index.
if (([self.pageContent count] == 0) || (index >= [self.pageContent count])) {
return nil;
}
// Create a new view controller and pass suitable data.
contentViewController *dataViewController =[[contentViewController alloc]initWithNibName:#"contentViewController"bundle:nil];
dataViewController.dataObject =[self.pageContent objectAtIndex:index];
return dataViewController;
}
- (NSUInteger)indexOfViewController:(contentViewController *)viewController
{
return [self.pageContent indexOfObject:viewController.dataObject];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController
{
NSUInteger index = [self indexOfViewController:(contentViewController *)viewController];
if ((index == 0) || (index == NSNotFound)) {
return nil;
}
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController
{
NSUInteger index = [self indexOfViewController:(contentViewController *)viewController];
if (index == NSNotFound) {
return nil;
}
index++;
if (index == [self.pageContent count]) {
return nil;
}
return [self viewControllerAtIndex:index];
}
- (void) createContentPages
{
NSMutableArray *pageStrings = [[NSMutableArray alloc] init];
for (int i = 1; i < 4; i++)
{
NSString *contentString = [[NSString alloc]initWithFormat:#"Chapter %d \nThis is the page %d of content displayed using UIPageViewController in iOS 5.", i, i];
[pageStrings addObject:contentString];
}
pageContent = [[NSArray alloc] initWithArray:pageStrings];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self createContentPages];
self.pageController = [[UIPageViewController alloc]initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
pageController.dataSource = self;
[[pageController view] setFrame:[[self view] bounds]];
contentViewController *initialViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
[pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:pageController];
[[self view] addSubview:[pageController view]];
[pageController didMoveToParentViewController:self];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
contentViewController.h
#import <UIKit/UIKit.h>
#interface contentViewController : UIViewController
#property (strong, nonatomic) IBOutlet UITableView *theTableView;
#property (strong, nonatomic) id dataObject;
#property (strong, nonatomic) NSArray *pageContent;
#end
contentViewController.m
#import "contentViewController.h"
#interface contentViewController ()
#end
#implementation contentViewController
#synthesize theTableView, dataObject, pageContent;
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void) createContentPages
{
NSMutableArray *pageStrings = [[NSMutableArray alloc] init];
for (int i = 1; i < 4; i++)
{
NSString *contentString = [[NSString alloc]initWithFormat:#"Chapter %d \nThis is the page %d of content displayed using UIPageViewController in iOS 5.", i, i];
[pageStrings addObject:contentString];
}
pageContent = [[NSArray alloc] initWithArray:pageStrings];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self createContentPages];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection (NSInteger)section
{
return 4;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath (NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = #"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
cell.textLabel.text = [pageContent objectAtIndex:indexPath.row];
return cell;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
So if anyone could straighten me out I would appreciate it.
I was able to solve my own problem, and it seems I was just a bit mixed up.
The comment from rdelmar set me on the right track but I hooked the delegate and data source to the wrong object. I had to connect them to File's Owner in order for it to work.
In addition it seems theTableView was not necessary and when I removed that my code suddenly worked as expected.
If this isn't clear enough for an answer please tell me how I can be more specific. Thank you!

IOS 5.1 ARC Unrecognized Selector Sent to Instance

I have been looking at similar question but couldn't figure it out what is the problem.It seems it should work but it gives me error.
In IOS 5.1 Ipad Stortyboard application I have a right navigation bar item when user click a popover view should open. I had a working popover view but design was not good so I replaced it with a new popover class now it gives me following error
-[UIButton view]: unrecognized selector sent to instance 0xa17ba80
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIButton view]: unrecognized selector sent to instance 0xa17ba80'
I have tried following functions but none has worked so far. It gives me similar errors when I change the code.
- (IBAction)setColorButtonTapped:(id)sender{
- (void)setColorButtonTapped:(id)sender{
- (IBAction)setColorButtonTapped:(id)sender forEvent:(UIEvent*)event {
- (void)setColorButtonTapped:(id)sender forEvent:(UIEvent*)event {
and ofcourse I have changed ti following regarding to ibaction or void
[backButton2 addTarget:self action:#selector(setColorButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
here is the code
my.h file
#import <UIKit/UIKit.h>
#import "ColorPickerController.h"
#interface MeetingViewController : UITableViewController<UIApplicationDelegate,UIAlertViewDelegate,DropDownListDelegate,MFMailComposeViewControllerDelegate,EGORefreshTableHeaderDelegate,ColorPickerDelegate>{
UIPopoverController *_popover;
ColorPickerController *_colorPicker;
UIPopoverController *_colorPickerPopover;
}
#property (nonatomic, strong) UIPopoverController *popover;
#property (nonatomic, strong) ColorPickerController *colorPicker;
#property (nonatomic, strong) UIPopoverController *colorPickerPopover;
- (IBAction)setColorButtonTapped:(id)sender;
#end
my.m file
#synthesize popover = _popover;
#synthesize colorPicker = _colorPicker;
#synthesize colorPickerPopover = _colorPickerPopover;
- (void)viewDidLoad
{
[super viewDidLoad];
//gear button on navigation Bar
UIImage* imageback2 = [UIImage imageNamed:#"ICON - Gear#2x.png"];
CGRect frameimgback2 = CGRectMake(0, 0, 40, 40);
UIButton *backButton2 = [[UIButton alloc] initWithFrame:frameimgback2];
[backButton2 setBackgroundImage:imageback2 forState:UIControlStateNormal];
[backButton2 addTarget:self
action:#selector(setColorButtonTapped:)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *btn2 = [[UIBarButtonItem alloc] initWithCustomView:backButton2];
self.navigationItem.rightBarButtonItem = btn2;
}
#pragma mark ColorPickerDelegate
- (void)colorSelected:(NSString *)color {
[self.colorPickerPopover dismissPopoverAnimated:YES];
}
#pragma mark Callbacks
- (IBAction)setColorButtonTapped:(id)sender {
if (_colorPicker == nil) {
self.colorPicker = [[ColorPickerController alloc] initWithStyle:UITableViewStylePlain];
_colorPicker.delegate = self;
self.colorPickerPopover = [[UIPopoverController alloc] initWithContentViewController:_colorPicker];
}
[self.colorPickerPopover presentPopoverFromBarButtonItem:sender permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}
utility class
ColorPickerController.h
#import <UIKit/UIKit.h>
#protocol ColorPickerDelegate
- (void)colorSelected:(NSString *)color;
#end
#interface ColorPickerController : UITableViewController {
NSMutableArray *_colors;
id<ColorPickerDelegate> __weak _delegate;
}
#property (nonatomic, strong) NSMutableArray *colors;
#property (nonatomic, weak) id<ColorPickerDelegate> delegate;
#end
utilityclass
ColorPickerController.m
#import "ColorPickerController.h"
#implementation ColorPickerController
#synthesize colors = _colors;
#synthesize delegate = _delegate;
#pragma mark -
#pragma mark Initialization
/*
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
if ((self = [super initWithStyle:style])) {
}
return self;
}
*/
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
self.clearsSelectionOnViewWillAppear = NO;
self.contentSizeForViewInPopover = CGSizeMake(150.0, 140.0);
self.colors = [NSMutableArray array];
[_colors addObject:#"Red"];
[_colors addObject:#"Green"];
[_colors addObject:#"Blue"];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Override to allow orientations other than the default portrait orientation.
return YES;
}
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [_colors count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
NSString *color = [_colors objectAtIndex:indexPath.row];
cell.textLabel.text = color;
return cell;
}
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (_delegate != nil) {
NSString *color = [_colors objectAtIndex:indexPath.row];
[_delegate colorSelected:color];
}
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
self.delegate = nil;
}
#end
Help is much appreciated , thanks
You're using a UIButton as a customView for a UIBarButtonItem. This could be the problem.
I suggest you use UIBarButtonItem's initWithImage:style:target:action: initializer instead.
UIButton is a view and as such has no view property or instance method.

Why is my tab bar controller crashing?

I'm trying to create a iPhone app that uses a tab bar controller. The first tab works fine.
However, when I click the second tab in the tab bar the whole app crashes. I am trying to implement a table view in the second tab.What could be causing the crash?
Here is my code:
SecondViewController.h
#import <UIKit/UIKit.h>
#class Person;
#interface SecondViewController : UIViewController<UITableViewDelegate, UITableViewDataSource >{
UITableView *tableView;
NSArray *persons;
}
#property (nonatomic, retain) IBOutlet UITableView *tableView;
#property (nonatomic,retain ) NSArray *persons;
-(void)initPersons:(NSArray *) array;
#end
SecondViewController.m
#import "SecondViewController.h"
#import "Person.h"
#implementation SecondViewController
#synthesize tableView;
#synthesize persons;
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
- (id)init {
if (self = [super initWithNibName:#"SecondViewController" bundle:nil]) {
//self.title = #"Slot";
UIImage* anImage = [UIImage imageNamed:#"cherry.png"];
UITabBarItem* theItem = [[UITabBarItem alloc] initWithTitle:#"table" image:anImage tag:0];
self.tabBarItem = theItem;
[theItem release];
}
return self;
}
-(void)initPersons:(NSArray *) array{
int size = [array count];
int i = 0;
NSMutableArray *aPersons = [NSMutableArray array];
while (i < size) {
Person *person = [[Person alloc]init];
NSString * name =[array objectAtIndex:i];
NSArray *chunks =[name componentsSeparatedByString: #" "];
person.firstName = [chunks objectAtIndex:0];
person.lastName = [chunks objectAtIndex:[chunks count]-1];
[aPersons addObject:person];
[person release];
i++;
}
self.persons=aPersons;
[aPersons release];
}
-(NSArray *)sortArray {
NSSortDescriptor *lastNameDescriptor = [[[NSSortDescriptor alloc]
initWithKey:#"lastName"
ascending:YES
selector:#selector(localizedCaseInsensitiveCompare:)] autorelease];
NSSortDescriptor *firstNameDescriptor = [[[NSSortDescriptor alloc]
initWithKey:#"firstName"
ascending:YES
selector:#selector(localizedCaseInsensitiveCompare:)] autorelease];
NSArray *sortDescriptors = [NSArray arrayWithObjects:lastNameDescriptor,
firstNameDescriptor, nil];
return [persons sortedArrayUsingDescriptors:sortDescriptors];
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
NSArray *array = [[NSArray alloc] initWithObjects:
#"Amin Alrusayni", #"Berksan Ates",
#"Becca Bedell", #"Joseph Carioti",
#"Christopher Conry", #"Jeremy Dobbins", #"Timothy Fox",
#"Eric Green", #"Timothy Gruscinski", #"Daniel Gur",
#"Yousef Guzaiz", #"Tyler Herzog", #"Alicia Johnson", #"Scott Kazakis",
#"Nathan Kidwell", #"Dakota Kincer", #"Scott Moore",
#"Sean Reber", #"Michael Romeo", #"Alexander Shibble",
#"Joshua Shipley", #"Mitchell Slemc", #"Thomas Smith",
#"Christopher Wagner", #"Corey Zachrich", #"Ahmed Alalawi",
#"Abdullah Alqahtani", #"Daniel Angelis", #"Brian Bartman",
#"William Haverstock", #"Hui Hong", #"Rong Li",
#"Amitkumar Mali", #"Christian Newman", nil];
[self initPersons:array];
NSArray *sortedArray = [self sortArray];
for (Person *person in sortedArray)
{
NSString *fullName = [[person.firstName stringByAppendingString:#" "] stringByAppendingString:person.lastName];
NSLog(#"%#",fullName);
NSLog(#" ");
}
[super viewDidLoad];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
//commented out this function
/*
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}*/
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[tableView dealloc];
[super dealloc];
}
#pragma mark -
#pragma mark TableView DataSource
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [self.persons count];
}
/*- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *SimpleTableIdentifier = #"SimpleTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:SimpleTableIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:SimpleTableIdentifier] autorelease];
}
NSUInteger row = [indexPath row];
cell.textLabel.text = [persons objectAtIndex:row];
return cell;
}*/
#end
It would be easier to help if you post your code using markdown formatting as Moshe commented. I did notice a few things with a quick scan. I also can't tell from this what you have created in interface builder and if the UITabBarController and all outlets are properly configured. You may have other things going on besides the following but here's a start.
Make sure you release anything you retain. for example, in viewDidLoad you allocate array and never release it.
Similarly, don't release things you haven't retained. In initPersons you create the mutable array aPersons using an array constructor that returns an autoreleased object. You then have [aPersons release]. This will cause a crash b/c you are releasing an object you haven't retained.
Clean up properly in viewDidUnload and dealloc. In both of these you need to release tableView. In dealloc you have [tableView dealloc]. That should be [tableView release]
Your data source creation is overly complicated but I do see a clear problem. You are setting self.persons in initPersons which is fine. You then sort the array and store it in sortedArray. Assuming your intent is to keep the array sorted, you are currently discarding the sorted array. self.persons remains the unsorted version. While this is not a crash, I doubt this was your intent.
You need to implement tableView:cellForRowAtIndexPath: This will absolutely cause a crash if missing. That's assuming you have the tableView delegate and dataSource configured correctly. You should add the protocols UITableViewDataSource and UITableViewDelegate to the interface definition for SecondViewController so you'll get the proper compiler warnings regarding implementing required protocol methods.
– tableView:cellForRowAtIndexPath: is required method of UITableviewDatasource protocol.so enable it.be happy
if u dont want any implementaion in it then just leave it with blank definition.
{
return cell;
}