I have this problem I've been sitting with. My tableView that I put inside my UIView is not populating or sometimes I get an exception.
// .h
#interface List : UIViewController <UITableViewDelegate, UITableViewDataSource>
{
UITableView *mTableView;
}
#property (nonatomic, readonly) IBOutlet UITableView *tableView;
//------------------------------
// .m
#synthesize tableView=mTableView;
//Further I do the normal viewDidUnload stuff = nill
//And the numberOfSectionsInTableView, numberOfRowsInSection and
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"cellForRowAtIndexPath:");
NSLog(#"Table View: %#",[tableView description]);
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.textLabel.text = #"Hi";
// Configure the cell...
return cell;
}
I get as output:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<List 0x6a78000> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key tableView.'
or just a list of empty cells, not even "Hi" as a title.
I'm almost sure that this error occurs because you have improperly connected your UITableView . You should delete an ivar mTableView, an IB outlet property tableView and #synthesize . Then DELETE AN OUTLET IN IB. Then, connect it again by dragging it from the interface builder and DO NOT TYPE ANY CODE in your class. Xcode will do all stuff for you (create a property, synthesize it and do MM things)
Make sure that you have set the delegate and the datasource of the table within Interface Builder
If you do not do anything with your IBOutlet why do you have it? The method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
is Called by the nib-File for the tableView instance created in the nib.Your Class as a delegate of this instance receives this call. Being the delegate of the tableView in the nib is all you need.
Related
I'm trying to create a custom UITableViewCell.
From XCode 4.6 interface builder, I've set the Style property of the cell to Custom. And added controls to the cell using drag and drop. 2 UILables and a UIButton. It looks like this.
I created a separate class deriving from UITableViewCell to assign the properties of the 3 UI elements and make the changes there. I've set the cell's custom class as DashboardCell from the Identity Inspector as well.
DashboardCell.h
#import <UIKit/UIKit.h>
#interface DashboardCell : UITableViewCell
#property (weak, nonatomic) IBOutlet UILabel *numberOfMails;
#property (weak, nonatomic) IBOutlet UILabel *mailType;
#property (weak, nonatomic) IBOutlet UIButton *numberOfOverdueMails;
#end
DashboardCell.m
#import "DashboardCell.h"
#implementation DashboardCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
[self.numberOfOverdueMails setBackgroundColor:[UIColor colorWithRed:244/255.0f green:119/255.0f blue:125/255.0f alpha:1.0f]];
[self.numberOfOverdueMails setTitle:#"lol" forState:UIControlStateNormal];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
#end
In the TableViewController, I have modified the following method to return my custom cell.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
DashboardCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[DashboardCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
return cell;
}
My problem is even though the custom button shows up, the changes I've done (changing the background color of the button, changing the title of one UILabel) aren't showing up. What seems to be the mistake here?
The method initWithStyle:reuseIdentifier: will not be called because you're using interface builder to create a cell.
You can set the background color and title by overriding the method awakeFromNib.
You can also set these in the method tableView:cellForRowAtIndexPath:
If you get your cell from a xib or storyboard, dequeueReusableCellWithIdentifier:forIndexPath: will always return a cell -- if one exists it will reuse it, if not it will create one from the template in IB. Therefore, your if(cell ==nil) clause will never be satisfied, and in fact is no longer needed. If you want to use an init method, then use initWithCoder:
IMPORTANT EDIT: I posted the wrong error code, like an idiot. I was posting the error for an attempt I had previously made to fix the issue, instead of the first error. Disregard my dumbness, please.
I'm creating a Facebook Feed app in Xcode, and I'm running into trouble in the creation of custom cells for a table. I'm trying to assign values to two UILabels on the custom cell, and it's giving me the error "No visible #interface for 'JSONFeedItemCell' declares the selector 'nameLabel'". My code is as follows:
Master View Controller
- (void)viewDidLoad
{
UINib *nib = [UINib nibWithNibName:#"JSONFeedItemCell" bundle:nil];
[[self tableView] registerNib:nib forCellReuseIdentifier:#"JSONFeedItemCell"];
... // other stuff, not relevant
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
JSONFeedItemCell *cell = [tableView dequeueReusableCellWithIdentifier:
#"JSONFeedItemCell"];
NSDictionary *p = [[[JSONFeedItemStore sharedStore] allItems]
objectAtIndex:[indexPath row]];
[[cell nameLabel] setText:#"The Name"];
return cell;
}
Cell Class
#import <Foundation/Foundation.h>
#interface JSONFeedItemCell : UITableViewCell
{
}
#property (weak, nonatomic) IBOutlet UIImageView *imageView;
#property (weak, nonatomic) IBOutlet UILabel *detailLabel;
#property (weak, nonatomic) IBOutlet UILabel *nameLabel;
#end
Let me know if you need any additional information or code, I'd be happy to provide it.
Two things: you have to make sure.
#import "JSONFeedItemCell.h" //in your mainViewController.h
And, as Wolfgang Schreurs suggested, typecast the cell:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
JSONFeedItemCell *cell = (JSONFeedItemCell *)[tableView dequeueReusableCellWithIdentifier:
#"JSONFeedItemCell"];
NSDictionary *p = [[[JSONFeedItemStore sharedStore] allItems]
objectAtIndex:[indexPath row]];
[[cell nameLabel] setText:#"The Name"];
return cell;
}
EDIT: since you don't use custom setters/getters you have to synthesize the properties
in JSONFeedItemCell.m
#synthesize imageView;
#synthesize detailLabel;
#synthesize nameLabel;
Compiler should warn you if you forgot to do that but with all the possible compiler settings you never know.
Do you maybe have something like a , I call it, circle import? Xcode gets messed up when you have 2 classes which imports each other. Xcode displays sometimes 'random' errors like this. And sometimes helps to clean and organize project, and restart pc. I have actually no idea why, but it helps sometimes.
I'm trying to create a couple of small, static tableviews and add them to a panel that I have which slides in and out. The panel is created programmatically so I can't lay the tableviews out inside it via storyboard, and anyway I'm not sure if this is possible anyhow: It seems the only way you can lay out static tableviews that work is in a tableviewcontroller, which takes up the whole screen.
If you can't tell I'm pretty new to iOS dev so if I'm not understanding some fundamental concepts here please feel free to explain.
Of course is possible. Here is how it can be done:
Drag a TableViewController to your storyboard.
Set its Size to Freeform, add an identifier and uncheck Resize View From NIB
Select the tableview and set its content to Static Cells. Design your cells.
Set its size
Now, wherever you need to instantiate it do it like this:
// I am using a UITableViewController as an example here
// you probably would like to set your actual controller subclass instead
UITableViewController *tableViewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"staticTv"];
UITableView *tableView = tableViewController.tableView;
[self.view addSubview:tableView]; // Or add it to whatever view
Enjoy :)
A UITableViewController isn't necessary to provide the functionality you need to manage a UITableView. I think what you're looking for is the "Delegate" pattern. Any UIViewController can be assigned to be the delegate of the UITableView. For example, I have a "static" table that shows some options in an app I am working on:
#interface LBOptionsViewController : UIViewController <UITableViewDataSource,
UITableViewDelegate>
If you're creating your table views programmatically, you'll probably either be creating them in viewDidLoad or loadView (if you're creating the actual view yourself). After you've created your tableView, assign the delegates:
self.tableView.delegate = self;
self.tableView.dataSource = self;
Then your UIViewController subclass will receive the data delegate messages like:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
Not sure if this helps you. I have not played with Storyboards much yet.
EDIT: #Alladinian has the right answer! If you're using an property for the view controller make sure you allocate it if you need it to be called by other methods.
I've yet to find a usefully reason to use static table view cells over dynamic. Table views were pretty scary when I started iOS programming. I used sqlite in my first app YIKES.
So yeah, you should just import the UITableView Data Source and Delegate and follow up by adding the table view to your panel (assuming it's a uiview and you can add the table view as a subview).
Anyways in your ViewController.h include UITableViewDataSource and UITableViewDelegate.
#interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
Next, add properties for a UITableView and an NSMutableArray:
#property (strong, nonatomic) UITableView* tableView;
#property (strong, nonatomic) NSMutableArray* tableViewContents;
In your ViewController's .m:
#synthesize tableView;
#synthesize tableViewContents;
inside ViewDidLoad:
self.tableViewContents = [NSMutableArray arrayWithObjects:#"Cell 1",#"Cell 2",#"Cell 3",nil];
[self.tableView setDelegate:self]
[self.tableView setDatasource:self]
In the .m file:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.tableViewContents.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSUInteger row = [indexPath row];
index = row;
static NSString *cellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
cell.textLabel.text = [tableViewContents objectAtIndex:row];
return cell;
}
I have a UIViewController that I want to use to implement the methods of UITableViewDataSource on. I have this header, FriendsController.h:
#import <UIKit/UIKit.h>
#interface FriendsController : UIViewController <UITableViewDataSource>
#end
Edit: now updated the #interface declaration to:
#interface FriendsController : UIViewController <UITableViewDataSource, UITableViewDelegate>
and this implementation, FriendsController.m:
#import "FriendsController.h"
#implementation FriendsController
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
NSLog(#"CALLED .numberOfRowsInSection()");
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"CALLED cellForRowAtIndexPath()");
UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:#"FriendCell"];
cell.textLabel.text = #"Testing label";
return cell;
}
#end
When run this gives me a '-[UIView tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x81734d0'. Can anyone see if there is something wrong with my implementation/declaration of .numberOfRowsInSection()?
Edit: I've added a technique for method listing from here and run the view 'unconnected', it outputs the following list:
[<timestamp etc>] Method no #0: tableView:numberOfRowsInSection:
[<timestamp etc>] Method no #1: tableView:cellForRowAtIndexPath:
[<timestamp etc>] Method no #2: numberOfSectionsInTableView:
[<timestamp etc>] Method no #3: tableView:didSelectRowAtIndexPath:
[<timestamp etc>] Method no #4: viewDidLoad
Post scriptum: Both #ThisDarkTao and #Pei got it right, as can be seen in my previous question documenting the visual parts, here.
You need to add UITableViewDelegate to the list of protocols in the interface file, like this: <UITableViewDataSource, UITableViewDelegate>
You also need all of the following delegate methods:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 1; // Number of rows
}
- (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];
}
cell.textLabel.text = #"Test Cell";
return cell;
}
In your xib/storyboard view, you also need to connect the tableview's delegate and datasource connections to the viewcontroller.
If you want your cells to 'do something' when you tap them, you also need to implement the following delegate method:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"Tapped cell %d",indexPath.row);
}
If you use the Storyboard in your project, you have to set the UIViewController's Class field to be your "FriendsController" on Identity Inspector of your storyboard.
So you can present your UIVIewController to be using your correct class (In this case, FriendController for you).
Pei.
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.