当我为 UIImageView 设置动画时，UITapGestureRecognizer 不起作用答案

【问题标题】：UITapGestureRecognizer not work when I animate the UIImageView当我为 UIImageView 设置动画时，UITapGestureRecognizer 不起作用
【发布时间】：2012-12-03 15:31:22
【问题描述】：

当我想为UIImageView 设置动画时，添加到其中的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];
                    }
                }];
            }
        }];
    }
}

【问题讨论】：

标签： ios animation gesture uitapgesturerecognizer

【解决方案1】：

您需要在动画期间允许用户交互。

UIViewAnimationOptions options = UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction;

【讨论】：

天啊。花了这么多时间来弄清楚为什么它不起作用。你的答案是救命稻草！
另外值得注意的是：将视图的 alpha 值设置为 0 会导致交互失败。为了解决这个问题，我将我的值设为低值 view.alpha = 0.05 而不是 0。
这是 Swift 5 的解决方案：UIView.animate(withDuration: 0.2, delay: 0.0, options: [.allowUserInteraction], animations: { self.backgroundColor = newColor })

【解决方案2】：

只是为 Swift 添加这个......这样的东西会很好用...... 使用 .AllowUserInteraction。

UIView.animateWithDuration(0.4, delay: 1.5, usingSpringWithDamping: 0.5, initialSpringVelocity: 20, options: UIViewAnimationOptions.AllowUserInteraction, animations:
                {self.frame = originalFrame}, completion: nil)

【讨论】：

如果你有很多动画选项，你可以像这样传递它们：``` UIView.animateWithDuration(1.0, delay: 0.2, options: [.CurveEaseOut, .Repeat, .Autoreverse, .AllowUserInteraction],动画：{ self.leftArrowImageView.alpha = 0.0 }，完成：nil)```