为什么我的 UIButton 的“内部修饰”事件没有被调用？

Question

I've made plenty of buttons and I can't figure out why this one won't work.

My hierarchy is set up like this:

View -> Scroll View -> Subview -> Button

There's a lot of other items in this subview and every one of them works when touched. In the interface builder I can see that the " Touch Up Inside " event is bound to my method

- (IBAction)favoritesButtonDepressed:(id)sender 

However, when I click the button, that method never executes and my breakpoint is subsequently never hit.

I noticed that even when I hold down my press on the button, the label doesn't change color (even though shows touch on highlight is enabled), but yet my other button on the view does.

User Interaction is enabled on the button as well as everything up the hierarchy.

In order for my items in the sub view to receive touch events, I made my scroll view look like the 4th answer in this post .

Answer 1

Aha, I got it. It turns out the subview which contained the button (along with the other controls) had a height of 740 and the button was at a Y of 781. Moving the button up fixed the issue. Since everything was displaying correctly, I didn't think to check the subview's height.

Answer 2

Make sure that your button is placed inside superView's bounds ,
If a button is placed outside superView's bounds, the button will not clickable,
because of the implement of the hitTest function

Answer 3

I think you have placed your button on UIImageView, if so, you have to make UserInteraction enable for that UIImageView. Please check.

Answer 4

If a UITapGestureRecognizer is implemented on any of super View of your button. then UIButtonEventTouchUpInside wont be fired.

you should implement UITapGestureRecognizer like this

tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRecognized:)];
[tapGesture setCancelsTouchesInView:NO]; // This should do what you want
[tapGesture setDelegate:self];

Answer 5

Another thing to consider is have you placed another view on top of it?

For example if you load another view from a nib and incorrectly frame it then it may well appear on top of the button thus intercepting any presses.

You can check this is XCode 6 with the "Debug View Heirachy" control.

Answer 6

Having layout looks like:

View -> Subview(UIView) -> Button

It's fixed by tick the "User Interaction Enabled" checkbox in the attributes of Subview(UIView).

Answer 7

If you have a parent UIView you can try to set its userInteractionEnabled property to True, in some cases it fixes the problem.

ParentView -> ChildView -> StackView -> UIButton

in this case I've set the userInteraction of ChildView to true and solved the problem.

Answer 8

I had something similar recently;

Try deleting the (IBAction)favoritesButtonDepressed:(id)sender declaration (and method) in your Controller, and "dragging" it over from Interface Builder again.

Answer 9

Please see the following discussions that may help you UIButton event 'Touch Up Inside' not working. 'Touch Down' works fine

UIButton touch up inside event not working in ios5 while it's ok in ios6

UIButton event 'Touch Up Inside' not working. 'Touch Down' works fine

Answer 10

In my case IBAction for the button was not working I tried in many ways. So I made an IBOutlet for the button and added click action by using "addTarget" method it worked like a charm.

[myButton addTarget:self action:@selector(dismissClickFunction:) forControlEvents:UIControlEventAllEvents];

Answer 11

Troubleshooting:

• Make sure there isn't a hidden view in front of your button.
• Make sure user interaction is set to true.

Answer 12

确保button.isEnabled没有设置为false

Answer 13

I had similar issue.

Open Debug View Hierarchy and make sure that none of the parent-views has height or width of zero .

In my case UIButton s were in a container ( UIView ) that was in a vertical UIStackView . I added a height constraint to the container and touch event started working.

Answer 14

I had the same problem.

I had a button in a xib that I placed inside a view.

I left the instance of the xib to its default small size set on import because I am resizing it automatically in code to handle device rotation.

That caused the button to not react to touch even if it was clearly in the middle of the screen.

I fixed it by simply changing the layout of the xib instance to fill the parent view.

Answer 15

Check if there are any constraints missing. All the constraints should be balanced with no red lines. This fixed the issue for me.

Answer 16

My ViewController was a sub controller for an area within another ViewController. I deleted a bunch of controls in it to simplify, but the remaining button would no longer handle handle tap downs, despite being enabled, and all views having userInteraction enabled.

I tried creating a button dynamically, didn't work. Thinking I had a bad resource from original build, I deleted derived data, quit Xcode, deleted app and rebuild from scratch, no go.

Finally I tried drawing the parent view's background in yellow, didn't show up confirming the problem was it's frame. The parent view frame was something like (0,0,320,200) in storyboard, but in viewDidAppear it was only 0 points in height and offset by 150 points vertically. I tried setting it manually and thankfully that hack didn't work. So I did what you should always do with storyboards that misbehave, I burned it with fire!

Actually I deleted it and created a fresh storyboard to replace it, containing only the views and controls for the new design. Linked up to my ViewController code, and it worked without any problems.

Answer 17

如果您的 UIButton 嵌入在 UIScrollView 中，请确保禁用滚动视图属性Delay Touch Down ，这为我解决了问题

Answer 18

It depends on a variety of things and situations.

1. Check Respond Chain of click by viewing hierarchy of a view and see maybe a view is top of another view and causes to click not working as you expected it's like Z-index in HTML!
2. Check userInteraction for the view is set to enabled
3. If you are using Storyboard check it's connected to correct action and check you haven't more than one action in the storyboard.