Question

嘿，伙计们，我从视图中尝试removeGestureRecognizer:时遇到了问题，

我想要做的是doubleTap其中一个imageView，并删除点击的imageView的singleTap手势，而不删除其他imageView的singleTap手势。

这是我如何生成视图，手势和机制：

·H

UITapGestureRecognizer *singleTap;

的.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时，它仍为2，它删除的是最后一个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

你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];
               }
            }
        }
    }

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

1 个答案: