Obj C delegate methods not assigned to UIButton (iOS)?

Question

I am trying to assign a delegate's method to a UIButton using addTarget:action:forControlEvents:. Everything compiles without warnings, the IBOutlet is connected to the button in Interface Bulder (XCode 4). If I moves the delegate's method to the controller, it works fine. (All code worked fine, but I refactored to use a delegate, it's my first try with delegates and protocols.)

(added) The protocol declaration, placed before @interface in the .h:

@protocol MMGLVDelegate<NSObject>
  -(void)receiveQuitRequest:(id)sender;
@end

In the controller interface, these properties:

@property (nonatomic, assign) id<TheDelegateProtocol> delegate;
@property (nonatomic, retain) IBOutlet UIButton *quitBtn;

In the controller implementation:

-(void)setDelegate:(id<MMGLVDelegate>)delegate {
  DLog(@"MMGLVSegmented setDelegate: Entered");
  _delegate = delegate;

  [self.quitBtn addTarget:self.delegate action:@selector(receiveQuitRequest:) 
                                   forControlEvents:UIControlEventTouchUpInside];
}

Any help appreciated. Changing target to any of self.delegate, _delegate, or delegate doesn't change app behavior.

What I'm hoping to do is not have to declare a class receiveQuitRequest: that then passes off to the delegate, I'd rather go straight to the delegate from the control.

is it accessory to call only delegate method on button click ? or some how to call it ? — Maulik

Dimple Dimple · Accepted Answer · 2011-07-15T13:05:52

I think you should write

[self.quitBtn addTarget:delegate action:@selector(receiveQuitRequest:) 
                                   forControlEvents:UIControlEventTouchUpInside];

I am not sure, but this may work in your case

Obj C delegate methods not assigned to UIButton (iOS)?

3 Answers