Question

I made a demo empty app and add a navigation controller with the view

UINavigationController *navBar = [[UINavigationController alloc]initWithRootViewController:objFirstViewControllerViewController];
[self.window addSubview:navBar.view];

After it i add a table view on the first view controller like this .

UITableView* demotableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, 320, 400) style:UITableViewStylePlain];
demotableView.delegate = self;
demotableView.dataSource = self;
[self.view addSubview:demotableView];

and the delegate function of the table view and main cell for row function like this way

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
 NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
  cell.textLabel.text = @"Hello this is sample text";
cell.textLabel.minimumFontSize = 12;
cell.textLabel.adjustsFontSizeToFitWidth = TRUE;
cell.textLabel.font = [UIFont fontWithName:@"Copperplate" size:18];
return cell;
}

But when i scroll on my table or click any cell to go on the next view it just crash and give these two error on clicking and scrolling respectively.

[__NSCFArray tableView:didSelectRowAtIndexPath:]
[__NSCFDictionary tableView:cellForRowAtIndexPath:]

I don’t understand what is getting wrong this code it have been working with the prior os properly

Any body can help please ?

Here is the code for did select row

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
Second *anotherViewController = [[Second alloc] initWithNibName:nil bundle:nil];
[self.navigationController pushViewController:anotherViewController animated:YES];

}

and no of row is this one

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

return 15;
}

Answer 1

Actually I misused the ARC what are the changes I made to make the app run successfully actually it was crashing due to memory leak I reference the class in delegate with local object but the it got released when it tried to add the data on it and when table’s delegate and datasource try to add the things in the current class it was released and it throw message from those message instances, I was stuck because I was thinking it is happening due to me having taken an empty kind of application but after adding the lines below in the delegate class I got the problem solved.

What I did in the delegate class in the .h file:

 FirstViewControllerViewController *objFirstViewControllerViewController;

@property (strong, nonatomic)  FirstViewControllerViewController *objFirstViewControllerViewController;

Then my table started behaving properly and all things that I was having problem in.