查找和删除某些名为UIGestureRecognizers的UIGestureRecognizer中的某个UIGestureRecognizer

Question

嘿,伙计们,我removeGestureRecognizer:从一个角度来看遇到了一个问题,

我想做的是doubleTap其中一个imageView,并删除tapped imageView的singleTap手势,而不删除其他imageView单一的手势.

这是我如何生成视图,手势和机制:

.H

UITapGestureRecognizer *singleTap;

.M

- (void)viewDidLoad 
{
    [super viewDidLoad];
    NSInteger i;
    for (i = 1; i <= 3; i++) 
    {
        UIImageView *imageView = [[UIImageView alloc] init];
        imageView.frame = CGRectMake(110, 70+80*(i-1), 100, 60);
        imageView.backgroundColor = [UIColor whiteColor];
        imageView.tag = i;
        imageView.userInteractionEnabled = YES;
        [self.view addSubview:imageView];

        UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleMethod:)];
        doubleTap.numberOfTapsRequired = 2;

        singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleMethod:)];
        [singleTap requireGestureRecognizerToFail:doubleTap];

        [imageView addGestureRecognizer:doubleTap];
        [imageView addGestureRecognizer:singleTap];
    }
}
- (void)singleMethod: (id)sender
{
    NSLog(@"SingleTap");
}
- (void)doubleMethod: (id)sender
{
    NSLog(@"%d",[((UITapGestureRecognizer *)sender).view.gestureRecognizers count]);

    UIImageView *imageView = nil;
    NSArray *tryToFindYou = [self.view subviews];
    for (imageView in tryToFindYou) 
    {
        if ([imageView isKindOfClass:[UIImageView class]] && imageView.tag == ((UITapGestureRecognizer *)sender).view.tag) 
        {
            [imageView removeGestureRecognizer:singleTap];
        }
    }

    NSLog(@"%d",[((UITapGestureRecognizer *)sender).view.gestureRecognizers count]);

}

但是我写的这些行找不到与双击图像视图相连的singleTap手势.

当NSLog .gestureRecognizers count,它仍然是2,它删除的是最后imageView的singleTap手势,它变为1,这是正确的.

我无法找到第一个和第二个,找到它们的任何想法？谢谢你阅读:)

Answer 1

您应该循环遍历添加手势的UIView类的gestureRecognizers属性,如下所示:

for (imageView in tryToFindYou) 
    {
        if ([imageView isKindOfClass:[UIImageView class]] && imageView.tag == ((UITapGestureRecognizer *)sender).view.tag) 
        {
            for(UIGestureRecognizer *gesture in [imageView gestureRecognizers])
            {
               if([gesture isKindOfClass:[UITapGestureRecognizer class]])
               {
                 if (gesture.numberOfTapsRequired == 1) 
                    [imageView removeGestureRecognizer:gesture];
               }
            }
        }
    }