ios - Objective - C: Hidding a button through a delegate

Question

I have two views a levelComplete view and a levelSelector view. What I would like to do is when the levelComplete shows or the ViewDidLoad occurs on that view I would like to send a delegate to the level selector to show a button in the view and then make that button UserInteractionEnabled so then I will then be able to programme that button to do something if its not hidden.

Answer 1

You want to necessarily do it via a delegate. Coz you can do it in a simpler way as well. When you call your secondView, just tell your button to hide. So your modified code to calling the second view controller becomes:

-(IBAction)passdata:(id)sender {
  secondview *second = [[secondview alloc] initWithNibName:nil bundle:nil];  
  self.secondviewData = second; 
  sender.hidden=YES;
  secondviewData.passedValue = textfield.text;
  [self presentModalViewController:second animated:YES];
}

And then you can set it to visible when your view loads up again using viewDidLoad. I can tell you how to do it via delegates if you need. Lemme know what works best.

EDIT - Solution by Delegates

Your secondView's Header file will be as follows:

@protocol SecondViewHandlerDelegate <NSObject>

- (void)viewHasBeenLoaded:(BOOL)success;

@end

@interface secondview :UIViewController {
  IBOutlet UILabel *label;  
  NSString *passedValue;
}
@property (nonatomic, retain)NSString *passedValue;

-(IBAction)back:(id)sender;

@end

Then, in the implementation file of secondView(.m), synthesise the delegate first by @synthesize delegate; . After this, in your viewDidLoad of secondView, add the following line:

[[self delegate] viewHasBeenLoaded:YES];

That should be enough for your secondView. Now onto the firstViewController, perform the following steps:

In the header file (.h), import your second view and implement the protocol:

@interface ViewController :UIViewController <SecondViewHandlerDelegate>{
..
..
}

In the implementation file (.m) of your firstViewController, implement this method:

- (void)viewHasBeenLoaded:(BOOL)success
{
    NSLog("Delegate Method Called");
    [myButton setHidden:YES];
}

And finally, in your code when you call the secondView, add this line: secondview *second = [[secondview alloc] initWithNibName:nil bundle:nil]; second.delegate = self; ...

That should solve your purpose. I'd appreciate if you could mark the answer as correct as well. Thanks :)