ios - 当我为 UIImageView 设置动画时，UITapGestureRecognizer 不起作用

Question

当我想为 UIImageView 设置动画时，添加到它的 UITapGestureRecognizer 无法工作。为什么？？？

-(void) testTap:(id)sender {
    NSLog(@"Test tap...");
}

-(void) testSlide {
    UITapGestureRecognizer* testTap = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(testTap:)] autorelease];
    testTap.numberOfTapsRequired = 2;

    UIImageView* imageView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"tip_slide"]] autorelease];
    [imageView setFrame:CGRectMake(40, 40, 200, 200)];
    imageView.userInteractionEnabled = YES;
    imageView.multipleTouchEnabled = YES;
    [imageView addGestureRecognizer:testTap];

    [self.view addSubview:imageView];


    // When I add the following code, the UITapGestureRecognizer will not work. WHY???
    imageView.alpha = 0;
    CGAffineTransform t = imageView.transform;
    if (CGAffineTransformIsIdentity(t)) {
        UIViewAnimationOptions options = UIViewAnimationCurveEaseInOut;
        [UIView animateWithDuration:1.0 delay:0 options:options animations:^{
            imageView.alpha = 1.0;
        } completion:^(BOOL finished) {
            if (finished) {
                [UIView animateWithDuration:1.0 delay:2.0 options:options animations:^{
                imageView.alpha = 0.4;
                } completion:^(BOOL finished) {
                    if (finished) {
                        [imageView removeFromSuperview];
                    }
                }];
            }
        }];
    }
}

Answer 1

您需要在动画期间允许用户交互。

UIViewAnimationOptions options = UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction;