UIView beginanimation不起作用

Question

当我在uiview中存在的uitableview中点击一个单元格时，我会使用此代码，但是当用户点击它时，它不会执行应该在单元格上执行的“flash”。

-(IBAction)labelTap:(UIGestureRecognizer *)sender
{
    if(sender.state != UIGestureRecognizerStateRecognized)
        return;

    UIView *tappedview=[sender.view hitTest:[sender locationInView:sender.view] 
                                  withEvent:nil];

    UIView *contentview1=tappedview.superview.superview;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.3];
    [contentview1 setAlpha:0];
    [contentview1 setAlpha:1];
    [UIView commitAnimations];

}

任何帮助表示感谢。

Answer 1

试试这个有效！

 UIView *contentview1=tappedview.superview;
[contentview1 setAlpha:0];
    [UIView animateWithDuration:0.3f
                     animations:^(void) 
    {
        // Animate the flash on tap


        [contentview1 setAlpha:1];

    }
    completion:^(BOOL finished) 
    {
        NSLog(@"Done! Now show the pop up");
    )];