there is a table view at my tab bar application' s firs tab. Then when click any row I want to do pushing secondviewController' s view. and there is label. The label's text must be selected row's text. I try this but not enter second tab :S How can I do this??? Also at secondViewController class have 3 view.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
SecondViewController *detailViewController = [[SecondViewController alloc] initWithNibName:#"SecondView" bundle:nil];
// ...
// Pass the selected object to the new view controller.
NSUInteger row2 = [indexPath row];
denemelik=row2;
[self.navigationController pushViewController:detailViewController animated:YES];
detailViewController.enyakinfirma.text= [ws2.CustomerName objectAtIndex:[indexPath row]];
NSLog(#"kontrol2 %#",ws2.CustomerName);
[detailViewController release];
}
I assume that enyakinfirma is your UILabel that you want to populate with the text. You cannot assign text to the label before the label is actually created and loaded. And that happens later, after you push the new view controller.
Thus you need to create a separate #property in order to keep track of this text you need:
// SecondViewController.h
#interface SecondViewController {
NSString *customerName;
}
#property (nonatomic, retain) NSString *customerName;
#end
When you create the view controller you assign this property:
detailViewController.customerName = ...;
And in your view controller's viewDidLoad method you update the text.
-(void)viewDidLoad {
// ...
enyakinfirma.text = self.customerName;
}
Related
I am attempting to pass the label for a given selected cell to a different view controller...
ListViewController.m
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSIndexPath *selectedIndexPath = [self.tableView indexPathForSelectedRow];
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:selectedIndexPath];
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:#"Storyboard" bundle: nil];
DetailViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:#"DetailVC"];
viewController.venueName = cell.textLabel;
[self.navigationController pushViewController:viewController animated:YES];
}
Here is my DetailViewController:
.h
#interface DetailViewController : UIViewController {
IBOutlet UILabel *venueName;
}
#property (nonatomic, strong) IBOutlet UILabel *venueName;
venueName never gets the data. In my .m I also synthesize the venueName.
This happens because your UILabel outlet is not connected at the time you set a string for it. I recommend you to create a string property to store the value and, in viewDidLoad in DetailViewController, you set the string to venueName.
Cheers!!
You need to modify the below like that for setting and getting the text:-
viewController.venueName.text = cell.textLabel.text;
So venueName, which is a pointer to a label, is made to point to an existing label that's part of a table cell. This is obviously wrong -- you don't mean to use the actual label from the table cell, but rather the text stored in it. Both the other answers here are correct: you surely mean to assign the text property of one label to that of the other, and the label that outlet viewController.venueName is connected to hasn't been created at the time this code executes.
The immediate thing you should do to fix your code is to assign the data in question (i.e. cell.textLabel.text) to a string property in the destination view controller. Have the -viewDidLoad or -viewWillAppear method in that controller set the text property of the venueLabel label. Either of those methods will be called after the view hierarchy is instantiated.
I am creating an app where you press a button and it opens up your contacts list. You can then select the contact you want to add and it imports their name and email into the app. I currently have that information going into labels but I want to add it to a table view cell. How would I do this?
My Code:
.h:
#import <UIKit/UIKit.h>
#import <AddressBookUI/AddressBookUI.h>
#interface FirstViewController : UIViewController <ABPeoplePickerNavigationControllerDelegate>
- (IBAction)showPicker:(id)sender;
#property (weak, nonatomic) IBOutlet UILabel *firstName;
#property (weak, nonatomic) IBOutlet UILabel *email;
#end
.m:
#import "FirstViewController.h"
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize firstName;
#synthesize email;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)showPicker:(id)sender {
ABPeoplePickerNavigationController *picker =
[[ABPeoplePickerNavigationController alloc] init];
picker.peoplePickerDelegate = self;
[self presentModalViewController:picker animated:YES];
}
- (void)peoplePickerNavigationControllerDidCancel:
(ABPeoplePickerNavigationController *)peoplePicker
{
[self dismissModalViewControllerAnimated:YES];
}
- (BOOL)peoplePickerNavigationController:
(ABPeoplePickerNavigationController *)peoplePicker
shouldContinueAfterSelectingPerson:(ABRecordRef)person {
[self displayPerson:person];
[self dismissModalViewControllerAnimated:YES];
return NO;
}
- (BOOL)peoplePickerNavigationController:
(ABPeoplePickerNavigationController *)peoplePicker
shouldContinueAfterSelectingPerson:(ABRecordRef)person
property:(ABPropertyID)property
identifier:(ABMultiValueIdentifier)identifier
{
return NO;
}
- (void)displayPerson:(ABRecordRef)person
{
NSString* name = (__bridge_transfer NSString*)ABRecordCopyValue(person,
kABPersonFirstNameProperty);
self.firstName.text = name;
ABMultiValueRef emails = ABRecordCopyValue(person, kABPersonEmailProperty);
NSString *emailId = (__bridge NSString *)ABMultiValueCopyValueAtIndex(emails, 0);//0 for "Home Email" and 1 for "Work Email".
self.email.text = emailId;
}
#end
OK, I am going to explain how you programmatically implement a very basic table view controller. It will be up to you, though, to figure out how to integrate this into your application.
Let's start with the header file, let's call it MyTableViewController.h:
#interface MyTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
}
#end
As you can see, your controller class adopts the protocols UITableViewDelegate and UITableViewDataSource.
Now let's look at a first snippet from the implementation file MyTableViewController.m. Your first job, obviously, is to create the controller's view. You do this in your controller's loadView method. If you want to learn more about the view life cycle and how to program a UIViewController I suggest you read the UIViewController class reference and the accompanying View Controller Programming Guide.
- (void) loadView
{
// Give the view some more or less arbitrary initial size. It will be
// resized later when it is actually displayed
CGRect tableViewFrame = CGRectMake(0, 0, 320, 200);
UITableView* tableView = [[[UITableView alloc] initWithFrame:tableViewFrame style:UITableViewStyleGrouped] autorelease];
self.view = tableView;
// Here we make sure that the table view will take as much horizontal
// and vertical space as it can get when it is resized.
UIViewAutoresizing autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
tableView.autoresizingMask = autoresizingMask;
// We need to tell the table view that we are both its delegate and
// its data source.
tableView.delegate = self;
tableView.dataSource = self;
}
Just to let you know: You can omit loadView entirely if your controller is a subclass of UITableViewController, but I deliberately do not take that shortcut so that I can show you how a table view needs a delegate and a data source. Most important ist the data source.
In the next snippet in MyTableViewController.m we are going to implement some basic UITableViewDataSource methods. For this you need to understand how a table view is structured: A table view is divided into sections, and each section has a number of cells. The point of having sections is to visually separate groups of cells, with an optional section header or footer. I am not going into details here, though, to keep this simple.
- (NSInteger) numberOfSectionsInTableView:(UITableView*)tableView
{
// Let's keep it simple: We want just one section
return 1;
}
- (NSInteger) tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
// Let's keep it simple: We want just one row, or table view cell.
// Since we only have one section (see above) we don't have to look
// at the section parameter.
return 1;
}
And now, finally, the centerpiece where you create your table view cell. Again, this is a UITableViewDataSource method that we implement. Note that we do not need to inspect the indexPath parameter only because we know that we only have one section and one row. In a real world application you will probably have to write switch-case or if-else statements that examine indexPath.section and indexPath.row so that you can distinguish between the different cells you need to create.
- (UITableViewCell*) tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
// This is very important for your future table view implementations:
// Always ask the table view first if it already has a cell in its
// cache. If you don't do this your table view will become slow when
// it has many cells.
NSString* identifier = #"MyTableViewCell";
UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (cell == nil)
{
// Aha, the table view didn't have a cell in its cache, so we must
// create a new one. We use UITableViewCellStyleValue1 so that the
// cell can display two pieces of information.
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:identifier] autorelease];
}
// Regardless of whether we got the cell from the table view's cache
// or create a new cell, we must now fill it with content.
// First, obtain the information about the person from somewhere...
NSString* personName = ...;
NSString* personEmail = ...;
// ... then add the information to the table cell
cell.textLabel.text = personName;
cell.detailTextLabel.text = personEmail;
return cell;
}
As a final nicety, we implement a UITableViewDelegate method:
- (void) tableView:(UITableView*)tableView didSelectRowAtIndexPath:(NSIndexPath*)indexPath
{
[tableView deselectRowAtIndexPath:indexPath animated:NO];
// Here you can react to the user tapping on the cell. If you
// don't want the user to be able to select a cell you can
// add the following line to tableView:cellForRowAtIndexPath:
// cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
It is difficult to tell how you should integrate this into your application. It all depends where you want to display the table view. Since you say you want to replace the two labels you already have, one possible approach could be this:
In Interface Builder, add the table view as a subview to the main view of your FirstViewController
Add an outlet to FirstViewController that you connect to the table view
Let FirstViewController adopt the protocols UITableViewDelegate and UITableViewDataSource
Connect FirstViewController to the delegate and data source outlets of the table view
Don't implement loadView from my example, you don't need it, you already have made all the connections etc. in Interface Builder
If you need further help with integration, I suggest that you ask a new question and possibly refer to this answer. Good luck.
I have two view controller. In first view controller I have list of names. When I click on that, I want the same name to be displayed in second view controller.
I have below code.
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// PropDetailViewController is second view controller
PropDetailViewController *prop = [self.storyboard instantiateViewControllerWithIdentifier:#"prop"];
ListOfProperty *propList = [propListFinal objectAtIndex:indexPath.row];
NSString *myText = [NSString stringWithFormat:#"%#", propList.addressOfFlat];
prop.detailLabel.text = myText;
prop.title = myText;
[self.navigationController pushViewController:prop animated:YES];
[tableView deselectRowAtIndexPath:indexPath animated:YES];
}
and in PropDetailViewController, I have #property (retain, nonatomic) IBOutlet UILabel *detailLabel;.
What I was expecting is when I click say Name 1, I will see Name 1 as text in UILabel and on the UINavigationBar too. However I only see Name 1 on navigation bar and not on UILabel.
It is not advisable to access an UIView item at that point in the program flow. When setting the value of prop.detailLabel.text the view may not have been loaded. When the view is loaded later then the UIView is updated with the default settings given in the XIB file in IB.
You should rather set an NSString property, lets say
#property (retain, nonatomic) NSString *propName;
assign it before pushing the view controller as you do. But use this property and not the UILable. And in PropDetailViewController in viewDidLoad do the following:
(void) viewDidLoad {
// call super viewDidLoad and all the works ...
self.detailLabel.text = propName;
}
Instead of viewDidLoad you could use viewWillAppear. Because viewDidLoad COULD be executed already when you assign the property's value.
If you want to be on the save side then invent a new init method where you hand over all the values that you want to be set upfront.
But I never did that in combination with storyboard (where you may use instantiate... rather than init...) and therefore I cannot give any advise out of the top of my head.
Another clean approach would be to stick with the propName property but to implement a custom setter -(void)setPropName:(NSString)propName; where you set the property (probably _propName if you autosynthesize) AND set the UILable text plus setting the UILable text within viewDidLoad.
Try this:
in .h
#property (retain, nonatomic) NSString *detailText;
in PropDetailViewController.m
Change line of code with
NSString *myText = [NSString stringWithFormat:#"%#", propList.addressOfFlat];
prop.detailText = myText;
prop.title = myText;
in ViewDidLoad:
[self.detailLabel setText:self.detailText];
I try adding objects to NSMutableArray from another class (secondViewController) and then add it to my UITableView in my FirstViewController, but it returns null when I print it using NSLog. Here is my set up.
FirstViewController.h:
#interface FirstViewController : UIViewController <UITableViewDelegate,UITableViewDataSource>{
IBOutlet UITableView *mytableview;
NSMutableArray *mytableinfo;
}
#property (nonatomic,retain) IBOutlet UITableView *mytableview;
#property (retain) IBOutlet NSMutableArray *mytableinfo;
FirstViewController.m
#import "FirstViewController.h"
#import "SecondViewController.h"
#synthesize mytableinfo,mytableview;
-(IBAction)addShift:(id)sender{
SecondViewController *secondViewController = [[SecondViewController alloc]init];
[self presentModalViewController:secondViewController animated:YES];
}
- (void)viewDidLoad
{
mytableinfo = [[NSMutableArray alloc]init];
[super viewDidLoad];
}
SecondViewController.m
#import "SecondViewController.h"
#import "FirstViewController.h"
#implementation SecondViewController
#synthesize dateformatter,mydatepicker,startingTime;
-(IBAction)saveShift:(id)sender{
FirstViewController *firstViewController = [[FirstViewController alloc]init];
[firstViewController.mytableinfo addObject:#"Hello world"];
NSLog(#"%#",firstViewController.mytableinfo);
[self dismissModalViewControllerAnimated:YES];
}
My goal is to ultimately feed a mytableviewfrom mytableinfo. I'm not even sure if this is the best way to go about it. Any advice would be appreciated.
In SecondViewController, you are creating a FirstViewController with alloc init. At that point, mytableinfo on FirstViewController is nil because you don't allocate until viewDidLoad.
What loads SecondViewController? Because you're dismissing it modally. If it's FirstViewController, then when you alloc init first view controller, you're not calling the instance that presented it modally.
It's also not very MVC to have one view poke at another like that. It creates code that's couple at the view layer and modifying data at the view layer. It is better to create a model and have both views modifying that model.
How to create a NSMutable Array which can access from different view controllers
Another way to communicate between views is for one view to pass a delegate (a callback) to the other view. That allows the other view to not be coupled to the other view - it only knows about the protocol for the delegate.
What exactly does delegate do in xcode ios project?
There is a point that look strange to me in your "SecondViewController" you dissmiss it like it's a modal.
My Question is then... who started the modal presentation?
A "FirstViewController"? If it's the case, why are you creating a new one, on dismissing the second, the First that launched it will resume it's activity.
An other thing that I don't understand is that the designated initializer for a UIViewController is
- (id)initWithNibName:(NSString *)nibName bundle:(NSBundle *)nibBundle
You can pass nil to both argument, if no nib need to be associated with.
And finaly, if you need to get back a NSMutableArray to a 1st ViewController (VC) from a 2nd VC that was modally presented by the 1st you can do this in the 2nd VC:
- (id)initWithMutableArray:(NSMutableArray *)theArray {
//... put standard init code here }
And make that the default initializer of your second VC. But this make sense only if 2nd VC absolutely need a mutable array.
And now for my curiosity because I don't understand this line
#property (retain) IBOutlet NSMutableArray *mytableinfo;
Why is this an IBOutlet? That look like a potential source of problem.
IBOutlet are usually pointers to UI elements in a xib file.
When populating a UITableView with an array that can be modified by multiple modal views during the course of your app, I find one of the best ways to do this is with NSUserDefaults. You can create an NSUserDefaults object for reference like this:
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
Then you can assign objects to each key in defaults, which is really just a plist (which is just a list of keys with objects associated with them.
So then, when you want to store the array in defaults, you can say:
[defaults setObject:mytableinfo forKey:#"tableInformationKey"];
Then, whenever you want to access that data, you can say:
NSMutableArray* tableInfoCopy = [defaults mutableArrayValueForKey:#"tableInformationKey"];
That will make you a copy of the array you have stored in NSUserDefaults (NSUserDefaults can be accessed from anywhere in your app), so then you can make changes to that mutable array you just made. Once you are done making changes, you can reassign it to NSUserDefaults like this:
[defaults setObject:tableInfoCopy forKey#"tableInformationKey"];
So when you populate your UITableView, in
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
put something like:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Foobar"];
if (cell == nil) {
// No cell to reuse => create a new one
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"Foobar"] autorelease];
// Initialize cell with some customization
cell.selectionStyle = UITableViewCellSelectionStyleBlue;
cell.textLabel.textColor = [UIColor blackColor];
}
NSArray* arrayOne = [defaults objectForKey:#"tableInformationKey"];
NSString* title = [arrayTwo objectAtIndex:indexPath.row];
//this goes to the index in the array of whatever cell you are
// at, which will populate your table view with the contents of this array (assuming the array contains strings)
// Customize cell
cell.textLabel.font = [UIFont fontWithName:#"Helvetica" size:25];
return cell;
}
Use them the easiest way is to put the array in your AppDelegate
// populate appDelegate's array
AppDelegate *appDelegate = (myAppDelegate *) [[UIApplication sharedApplication] delegate];
[appDelegate.arrayMyTableInfo addObject:#"HelloWorld"];
Here is how you can do what I've suggested :
(This is part of your code updated)
This is in your secondView, this is one of many way to pass the array to your second view.
#synthesize array4Test;
- (id)initWithMutableArray:aMutableArray
{
self = [self initWithNibName:nil bundle:nil];
if (self)
{
self.array4Test = aMutableArray;
}
return self;
}
- (void)dealloc
{
// HERE clean up the property is set to retain.
self.array4Test = nil;
[super dealloc];
}
Here is the code for the firstView
-(IBAction)addShift:(id)sender{
SecondViewController *secondViewController = [[SecondViewController alloc] initWithMutableArray:self.mytableinfo];
[self presentModalViewController:secondViewController animated:YES];
}
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.mytableview reloadData];
NSString *aString = [mytableinfo lastObject];
if (aString)
{
NSLog(#"This just came back from the second View\n%#", aString);
}
}
Hi I have a tab tab controller and my first tab includes a view with:
3 text fields
a submit button
a tableView
Once I fill in the text fields I click submit and it adds the information to my managedObjectContext which is an sqlite database (CoreData).
As soon as I click submit I want the tableView to reload to include the added object. Currently my tableView will display the data in the database but it will only add the new row when I stop and re-run the simulator
This is the code for when the add button is tapped, it is here that I can't get the reload tableView working because it says tableView is an undeclared identifier, what have i missed?
-(IBAction)addButtonTapped:(id)sender {
NSLog (#"Add Button Tapped");
NSLog(#"Adding %# units of item code %# at $%# each",quantityTextField.text,productTextField.text,priceTextField.text);
Products_MarketAppDelegate* delegate = [[UIApplication sharedApplication] delegate];
NSManagedObjectContext* managedObjectContext = delegate.managedObjectContext;
NSManagedObject* newProduct;
newProduct = [NSEntityDescription insertNewObjectForEntityForName:#"Product" inManagedObjectContext:managedObjectContext];
[newProduct setValue:productTextField.text forKey:#"itemCode"];
[newProduct setValue:quantityTextField.text forKey:#"quantity"];
[newProduct setValue:priceTextField.text forKey:#"price"];
if ([managedObjectContext hasChanges])
NSLog(#"Managed Object Changed");
NSError* error;
[managedObjectContext save:&error];
// Insert Reload Table Code Here
// ** I have tried the following and it gives an error "Use of undeclared identifier 'tableView'"
//[tableView reloadData];
//[self.tableView reloadData];
}
As you can see below I have added the UITableViewDelegate & UITableViewDataSource in the header file. I have also hooked up the tableview in IB so that the delegate and datasource connections are linked to file's owner.
#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#interface FirstViewController : UIViewController
<UIApplicationDelegate, UITableViewDataSource,UITableViewDelegate,NSFetchedResultsControllerDelegate>
{
IBOutlet UITextField *productTextField;
IBOutlet UITextField *quantityTextField;
IBOutlet UITextField *priceTextField;
NSMutableArray *items;
NSFetchedResultsController *fetchedResultsController;
}
#property (nonatomic, retain) NSMutableArray *items;
#property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
-(IBAction)addButtonTapped:(id)sender;
#end
This is the code to fill the tableView which works correctly
#pragma mark TableView
-(NSInteger)numberOfSectionsInTableView: (UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];
}
- (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] autorelease];
}
// Configure the cell
Product* productItem =[fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = [NSString stringWithFormat:#"%# x %# # $%#",productItem.quantity,productItem.itemCode,productItem.price];
return cell;
}
I have searched for answers on this site and on others but I must be doing something different and the solutions aren't helping me
Your UIViewController does not currently have an instance variable pointing to your tableview. Set one up:
#property (nonatomic, retain) IBOutlet UITableView *myTableView;
Remember to synthesize this in your .m
#synthesize myTableView;
Then in your code you can call
[self.myTableView reloadData];
You might have got confused by looking at code examples that use a UITableViewController instead of a UIViewController. The UITableViewController already has an instance variable called tableView, so your subclass wouldn't need it's own tableView instance variable declared. But you're using a UIViewController, so you must declare a tableView instance variable.
Thanks #MattyG for all your help. At first I wasn't sure if I was going against the norm and thats why it wasn't working.
I ended up solving the problem due to your suggestions & it works perfectly! I used the debugger and found that that although we had created a property for the table I had not created an IBOutlet and linked it in my nib file with:
IBOutlet UITableView *myTableView;
I guess this meant that I was telling myTableView to reload but it wasn't hooked up to my table and thus couldn't use the datasource methods.