Question

我有subview imageview PanGestureRecognizer，主视图有LongPressGestureRecognizer。我已将longpress仅添加到此视图中：

screenRecognize = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(screenTaped:)];
screenRecognize.minimumPressDuration = 0.0;
self.userInteractionEnabled = YES;
[self addGestureRecognizer:screenRecognize];

这是imageview：

imageViewPanRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(imageViewPulled:)];

imageView = [[UIImageView alloc] initWithFrame:CGRectMake(310, 50, 10, 40)];
imageView.image = [UIImage imageNamed:@"image.png"];
imageView.userInteractionEnabled = YES;
[imageView addGestureRecognizer:imageViewPanRecognizer];
[self addSubview:imageView];

当我触摸imageView时，UILongPressRecognizer被触发。这是为什么？

Answer 1

答案已经在您的问题中。你设置

screenRecognize.minimumPressDuration = 0.0;

这意味着，UILongPressGestureRecognizer将像UITapGestureRecognizer一样工作。按行

[self addGestureRecognizer:screenRecognize];

你在自我的所有地方都有效。

现在，当您在自我中添加imageView时，imageView还将响应UILongPressGestureRecognizer以及仅在imageView上处于活动状态的UIPanGestureRecognizer。因此，触摸imageView会触发UILongPressGestureRecognizer。

要解决此问题，您可以尝试增加 minimumPressDuration 值。

Answer 2

1）为什么你使用minimumPressDuration = 0的长手势？无法正确使用平移手势？

2）如果你想让这些手势一起工作，试试这样的事情：

longGesture.delegate = self;
...
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

3）如果你不知道如果用户平移到UIImageView长手势禁用，请尝试这样的事情：

self.tag = 1;
longGesture.delegate = self;
...
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    return touch.view.tag == 1;
}

UILongPressGestureRecognizer识别其视图外的触摸

2 个答案: