UIButton inside a UIView not working after UIView is animated

问题

I have seen many questions in this forum which gives answer to this topic "UIButton inside a UIView, when animated doesn't work", but after having tried out the answers like

a) UIViewAnimationOptionAllowUserInteraction to the options
b) subView.setUserInteractionEnabled = YES
c) [button addTarget:self action:@selector(buttonPressed) forControlEvents:UIControlEventTouchUpInside];

none of them is working for me :-(

Here is the scenario. App is in landscape mode and a UIView called menuView is placed at x=480,y=0. Its height=200 and width=150. So, when I tap the button on the top right corner, the following code is executed

- (IBAction)showMenu {
    [menuView setUserInteractionEnabled:YES];
    [optionsButton setUserInteractionEnabled:YES];
    [UIView animateWithDuration:0.5 delay:0.0 options:UIViewAnimationCurveEaseOut |  UIViewAnimationOptionAllowUserInteraction
                     animations:^{
                         self.view.frame = CGRectOffset(self.view.frame, 0, 200);
                     }
                     completion:NULL];
}

Output?: View is appearing, but optionsButton inside the menuView is not clickable. I hooked up to an event, did an NSLog(@"Options button clicked"), but nothing happens :-(

Please tell me what I am doing wrong?

Update: When I place the subview that is "menuView" inside the self.view, then upon running and click the optionsButton, I get the NSLog message. Only if I specify the origin.x of menuView to be 480 and above, it doesn't work.

回答1:

If you can see the UIButton, its userInteractionEnabled (YES by default!) is set, and its superview's userInteractionEnabled in the whole hierarchy is YES - you should be able to interact with it.

An animation will never change your userInteractionEnabled property! So what you are doing there is simply unnecessary. If you try to enable interaction during animation - that's a different story and is just an option passed to the animation message.

So if that's not your problem (and is probably not), then I guess one of the superview's frame is cropping the UIButton!

Now you see, if a UIButton (or any UIView) is outside a UIView's frame, it can still be visible, unless clipsToBounds is set on the superview.

And the outcome of that situation is: You can see me, but you can't touch me.

回答2:

In my case missing a constraint on the height of the containing view caused the view height to be 0. Buttons were visible, below the view, but untouchable.

回答3:

For me it was all about an overlooked mistake in the animation code itself. Where my new height was being called I was actually calling my new width, and where my new width was being called I was actually calling my new height, therefor causing the UIView to be super long yet super narrow, thus pushing all content within the center of view, outside of the view reach.

Change your UIViews background color to Red so that you can actually see where it animates to.
If your UIView is within another view, turn on clipSubviews so that you only see what is actually enabled within the subView.
Run your project.

If your UIView is not its normal height and width, more than likely you have overlooked some code in your animation call.

Make sure that your x, y, width, height are being shown in the correct orders within the animation code.

回答4:

In my case, it seems like my animated transitioning is not yet completed. I forgot to to put completeTransition:Bool at the end of my animateTransition:context method.

来源：https://stackoverflow.com/questions/15184104/uibutton-inside-a-uiview-not-working-after-uiview-is-animated

标签

objective-c

uibutton

uiviewanimation