UIPanGestureRecognizer与滚动视图冲突

我试图将一个平移手势识别器添加到包含滚动视图的视图，但我想我遇到了优先级问题。UIPanGestureRecognizer与滚动视图冲突

我的全球的UIView有UIPanGestureRecognizer这样设置：

_bottomPanGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(bottomPanGestureDetected:)]; 
_bottomPanGestureRecognizer.minimumNumberOfTouches = 2; 
_bottomPanGestureRecognizer.maximumNumberOfTouches = 2; 
_bottomPanGestureRecognizer.delaysTouchesBegan = NO; 
_bottomPanGestureRecognizer.delaysTouchesEnded = NO;

我想认识这个手势带有某种捏来显示从底部另一种观点认为下降到了。

问题是滚动视图在我的面前识别自己的平移手势。

于是，我就延迟它感谢：

[_scrollView.panGestureRecognizer requireGestureRecognizerToFail:_bottomPanGestureRecognizer];

，它的工作，滚动视图事件被我的两个手指下降到了识别后被解雇，但现在的问题是，当我只用一个手指在滚动视图中滚动，滚动在一小段延迟后工作。

我想这个活动没有延迟，这是可能的吗？任何想法欢迎！

干杯。

Cyril

来源

2013-02-01 cyrilPA

你试过设置'的'maximumNumberOfTouches'到_scrollView.panGestureRecognizer''1'？ – kovpas

是的但奇怪的是，这种情况似乎被忽略了。 – cyrilPA

好吧，另一个选择是实现'UIGestureRecognizerDelegate'的'gestureRecognizerShouldBegin：'并检查那里的触摸次数。所以如果是两个触摸，'return NO' – kovpas

如果还没有解决，我解决了我的问题。

我添加了一个UIPanGestureRecognizer到一个UIScrollView来检测两个手指平移手势和默认的UIScrollView行为（滚动到某些东西）仍然工作。

所以我所做的是给UIPanGestureReconizer添加到UIScrollView中：

UIPanGestureRecognizer *pangestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(displayReloadIndicator:)]; 
pangestureRecognizer.minimumNumberOfTouches = 2; 
pangestureRecognizer.delegate = self; 
[self.scrollView addGestureRecognizer:pangestureRecognizer]; 
[pangestureRecognizer release];

在此之后我加入了代码：

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

    return YES; 
}

在此之后，我实现了移动手势识别操作方法。

- (void) displayReloadIndicator:(UIPanGestureRecognizer*) panGestureRecognizer { 

    UIGestureRecognizerState gestureRecognizerState = gestureRecognizer.state; 

    CGPoint translation = [gestureRecognizer translationInView:self.scv_bibgesamt]; 

    if (gestureRecognizerState == UIGestureRecognizerStateBegan) { 

     // create a UIView with all the Pull Refresh Headers and add to UIScrollView 
     // This is really much lines of code, but its simply creating a UIView (later you'll find a myRefreshHeaderView, which is my base view) and add UIElements e.g. UIActivityIndicatorView, a UILabel and a UIImageView on it 
     // In iOS 6 you will also have the possibility to add a UIRefreshControl to your UIScrollView 

    } 

    else if (gestureRecognizerState == UIGestureRecognizerStateEnded 
      || gestureRecognizerState == UIGestureRecognizerStateCancelled) { 

     if (translation.y >= _myRefreshHeaderView.frame.size.height + 12) { // _myRefreshHeaderView is my baseview 

     //so the UIScrollView has been dragged down with two fingers over a specific point and have been release now, so we can refresh the content on the UIScrollView 
     [self refreshContent]; 

     //animatly display the refresh view as the top content of the UIScrollView 
     [self.scrollView setContentOffset:CGPointMake(0, myRefreshHeaderView.frame.size.height) animated:YES]; 
    } 

    else { 

     //the UIScrollView has not been dragged over a specific point so don't do anything (just scroll back to origin) 
     [self.scrollView setContentOffset:CGPointMake(0, 0) animated:YES]; 

     //remove the view (because it's no longer needed) 
     [_myRefreshHeaderView removeFromSuperview]; 
    } 
}

UPDATE：

如果你不妨在刷卡回功能从navigationcontroller整合，您应该结合下面的代码：

- (void) viewDidLoad { 

    [super viewDidLoad]; 


    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) { 

     self.navigationController.interactivePopGestureRecognizer.enabled = YES; 

     self.navigationController.interactivePopGestureRecognizer.delegate = nil; 
    } 

    //setup view controller 
}

和

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch { 

    if (gestureRecognizer == _panGestureRecognizer 
     && [self.navigationController.viewControllers count] > 1) { 

     CGPoint point = [touch locationInView:self.view.window]; 

     if (point.x < 20 
      || point.x > self.view.window.frame.size.width - 20) { 

      return NO; 
     } 
    } 

    return YES; 
}

来源

2013-05-15 11:57:01 NicTesla

谢谢@NicTesla – channi

不客气:) – NicTesla

将panRecognizer委托实现到e nable同时识别的UIScrollView UIGestureRecognizer

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 
{ 
    if (_panRecognizer == gestureRecognizer) { 
     if ([otherGestureRecognizer.view isKindOfClass:UIScrollView.class]) { 
      UIScrollView *scrollView = (UIScrollView *)otherGestureRecognizer.view; 
      if (scrollView.contentOffset.x == 0) { 
       return YES; 
      } 
     } 
    } 

    return NO; 
}

来源

2016-03-10 07:11:35 simalone

UIPanGestureRecognizer与滚动视图冲突

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