UISegmentedControl在UIView中没有响应

Question

I have a UIView property named viewToFade that contains a UISegmentedControl . When I animate the UIView (so it appears on tapping and gradually fades), the UISegmentedControl doesn't respond to touches. Here's the code I'm using:

-(void)fadeView
{
self.viewToFade.alpha=1;
self.viewToFade.hidden=NO;

//When I comment the following lines out, everything is fine--the `UISegmentedControl` responds as it should.  
//But when I include them, the `UISegmentedControl` doesn't register changes/taps.

[UIView animateWithDuration:0.3
                      delay: 3.0
                    options:UIViewAnimationOptionAllowUserInteraction
                 animations:^{
                     self.viewToFade.alpha = 0.0;
                 }
                 completion:nil];
}

What am I doing wrong?

(In case it's relevant, I'll say that the UIView and the UISegmentedControl are both created in the xib file.)

EDIT: I figured out a way to deal with the problem, which was to rewrite the code as follows:

-(void)fadeView
{
self.viewToFade.alpha=1;
self.viewToFade.hidden=NO;
[self performSelector:@selector(disneyfy) withObject:nil afterDelay:(3)];
} 

-(void)disneyfy
{
    [UIView animateWithDuration:0.3
                 animations:^{
                     self.viewToFade.alpha = 0.0;
                 }];
}

Answer 1

I played around with this in a sample project and could duplicate your results - nothing I did even animating (in my case) a button itself rendered it immune to touches. However in my limited test I was able to see that it did respond to highlighting.

I just tested the following (using a UIBuutton, suppose the same thing will work for segmented control):

• add a transparent view over your button, and add a gesture recognizer to it, just before the animation

• have the actionMethod of the tap recognizer change the highlighting of the button on, then dispatch a block to turn it off in 100ms or so (you could get fancier if you actually intercept touches).

• in addition to changing the highlighting, send something like this to the control (again using a button) :

   [tapButton sendActionsForControlEvents:UIControlEventTouchUpInside]; 

It appears the control is responsive to such things during the animation.