UIButton subclass not responding to super methods?

Question

I would like to create a UIButton that toggles its image. Once clicked the image should change to another one and stay that way until clicked again.

I have added both images to the default and selected states of the button on interface builder.

Now, I have created a UIButton subclass. My idea is to intercept the tap to that button and change the button state. So I added this to the UIButton subclass, hoping one of these methods would be triggered by a tap.

- (void)sendAction:(SEL)action
                to:(id)target
          forEvent:(UIEvent *)event {

  [super sendAction:action to:target forEvent:event];

  // toggle state
  [self setSelected:![self isSelected]];

}


- (void)sendActionsForControlEvents:(UIControlEvents)controlEvents {
  [super sendActionsForControlEvents:controlEvents];

  // toggle state
  [self setSelected:![self isSelected]];

}


- (void)touchesEnded:(NSSet *)touches
           withEvent:(UIEvent *)event {

  [super touchesEnded:touches withEvent:event];
  // toggle state
  [self setSelected:![self isSelected]];
}

None of these methods are triggered. Any clues?

Is button hooked up to one of these in IB & is it set to the subclass in identity inspector? — mc01, Feb 11 '15 at 17:44
Maybe you should try a different approach, check this [question](http://stackoverflow.com/questions/13202161/why-shouldnt-i-subclass-a-uibutton) — Leonardo, Feb 11 '15 at 17:55
what do you mean? The button was added on interface builder and an action was set there, by dragging to the class it is being used. — Duck, Feb 11 '15 at 17:55

score 1 · Accepted Answer · edited May 23 '17 at 11:52

I could be barking up the wrong tree (pun partially intended), but I created a Swift project that does what I think you're asking for. I realize you're using ObjC, but for sake of time on my part I made it in Swift. In any case, it'll give you somewhere to start.

Here is the repo on GitHub: Click Here
--> Note: You'll need >= Xcode 6 to run the project.

A few things to note in the project:
1 - Be sure and connect the Button on Main.storyboard to the class you've created.
2 - In Swift, the class MyButton: UIButton is the line that implements UIButton for the class. I'm certain there's an ObjC equivalent, this Stack Overflow question may be helpful syntactically: Click Here

Hopefully some of this is helpful!

Good luck,
Kyle

Thanks. I just recreated everything and it is now working. It must be one of those Xcode issues. — Duck, Feb 11 '15 at 18:12

score 0 · Answer 2 · answered Feb 11 '15 at 17:45

0

My guess is that the first two aren't called because the button doesn't have any targets registered with selectors. The third not being called is a little surprising.

That being said, you should to try [self addTarget:self action:@selector(buttonTapped:) forControlEvents: UIControlEventsTouchUpInside].

answered Feb 11 '15 at 17:45

InkGolem

2,662
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the action is being set on interface builder. Surprisingly, if I add a breakpoint to the action, I see this on the thread: `[UIApplication sendAction:to:forEvent:]`, that in theory is the first method I have added. – Duck Feb 11 '15 at 17:54

score -1 · Answer 3 · answered Feb 11 '15 at 17:48

-1

The only way this can happen is if you haven't called addTarget on the UIButton subclass.

answered Feb 11 '15 at 17:48

Vinod Vishwanath

5,821
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what do you mean? The action is set on interface builder. – Duck Feb 11 '15 at 17:59

UIButton subclass not responding to super methods?

3 Answers3