当我为UIImageView设置动画时，UITapGestureRecognizer不起作用 [英] UITapGestureRecognizer not work when I animate the UIImageView

问题描述

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

When I want to animate the UIImageView, the UITapGestureRecognizer added to it can not work. WHY???

-(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];
                    }
                }];
            }
        }];
    }
}

推荐答案

你需要在动画期间允许用户交互。

You need to allow user interaction during animation.

UIViewAnimationOptions options = UIViewAnimationCurveEaseInOut | UIViewAnimationOptionAllowUserInteraction;

这篇关于当我为UIImageView设置动画时，UITapGestureRecognizer不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！