Question

我在视图上添加了两个手势。一个是轻击手势，另一个是轻扫手势。每当用户尝试滑动视图时，点击手势方法就会被调用（检测到轻击手势）。可能是什么原因？在这种情况下，点击手势应该被忽略。

下面是代码。

UISwipeGestureRecognizer *swipeGest = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(itemSwiped:)];
 swipeGest.direction =  UISwipeGestureRecognizerDirectionUp ;
[messageView addGestureRecognizer:swipeGest];

UITapGestureRecognizer *gest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(itemSelected:)];
[messageView addGestureRecognizer:gest];

Answer 1

因为您在同一视图上使用多个手势。这可能会过度隐藏另一个属性。对于Ex：第一个手势识别器识别手势（在这种情况下点击）它取消所有触摸事件。因此，剩余的手势识别器永远不会完成识别，并且永远不会发射它们的事件。

要在同一视图中添加多个UIGestureRecognizer，您需要设置委托属性（UIGestureRecognizerDelegate）

yourGesture.delegate = self

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
        shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{


 if (gestureRecognizer isKindOfClass: [UISwipeGestureRecognizer class] || gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]) {
            return YES
        } else {
            return NO
        }
}

Answer 2

使用此委托方法来避免其他手势

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

        if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {

            [otherGestureRecognizer requireGestureRecognizerToFail:gestureRecognizer];
            return false;
        }else if([gestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]]){
            [otherGestureRecognizer requireGestureRecognizerToFail:gestureRecognizer];
            return false;
        }

        return true;

    }

Answer 3

试试这个;

UISwipeGestureRecognizer *swipeGest = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(itemSwiped:)];
swipeGest.direction =  UISwipeGestureRecognizerDirectionUp ;
[messageView addGestureRecognizer:swipeGest];

UITapGestureRecognizer *gest = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(itemSelected:)];
gest.numberOfTapsRequired = 1;
[messageView addGestureRecognizer:gest];


-(void)itemSwiped:(UISwipeGestureRecognizer*)gesture
{
  NSLog(@"swipe");
}

-(void)itemSelected:(UITapGestureRecognizer*)gesture
{
  NSLog(@"tap");
}

Answer 4

Change single tap to doubletap gesture. so you can be sure user only double tap or swipe. It is good advice from me please follow it.

同一视图上的MultipleGesture

4 个答案: