让 UIPanGesture 和 UISwipeGesture 朝着同一个方向一起工作

Posted 2023-03-12

【中文标题】让 UIPanGesture 和 UISwipeGesture 朝着同一个方向一起工作

【英文标题】：Getting UIPanGesture and UISwipeGesture working together in the same direction

【发布时间】：2014-05-26 20:02:07

【问题描述】：

我已经设置了我的UIView，以便在视图向上平移时调用一个方法，并在视图向上滑动时调用其他方法。我的平底锅工作正常，如果我的 velocity.y 超过某个限制，我可以让我的平底锅保持禁用状态，但是当我的平底锅出现故障时，我永远无法让滑动动作起作用。我尝试过使用委托方法，但运气不佳。看过这个解决方案但没有运气：https://***.com/a/21728621/1925859

- (void)viewDidLoad

    [super viewDidLoad];

    UIPanGestureRecognizer * panRec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
    panRec.delegate = self;
    [panedView addGestureRecognizer:panRec];

    UISwipeGestureRecognizer * swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];
    swipeRec.delegate = self;
    [panedView addGestureRecognizer:swipeRec];

    [swipeRec requireGestureRecognizerToFail:panRec];


- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

    if ([gestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
    
        UIPanGestureRecognizer *pan = (UIPanGestureRecognizer *)gestureRecognizer;
        CGPoint velocity = [pan velocityInView:gestureRecognizer.view];
        if (ABS(velocity.y) > 200)
        

            NSLog(@"Swipe actiavted");
            return NO;
        
    
        return YES;  


 - (IBAction)handleSwipe:(UISwipeGestureRecognizer *)recognizer

    NSLog(@"In Swipe");
     if(recognizer.direction == UISwipeGestureRecognizerDirectionUp)
    
        panedView.frame =CGRectOffset( panedView.frame, 0, -1*self.view.bounds.size.height*.80);
    

【问题讨论】：

你应该（a）在你实例化它时指定滑动手势的方向（它让你不必担心平移的速度）； (b) 使平底锅要求滑动失败，而不是相反。你甚至可能不再需要那个委托方法了……

【参考方案1】：

如果您删除您的委托方法，向滑动添加方向并更改requireGestureRecognizerToFail 的接收者，那么它将起作用。请注意，平移必须比扫描慢得多才能被识别。

- (void)viewDidLoad

    [super viewDidLoad];

    UIPanGestureRecognizer * panRec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
    [panedView addGestureRecognizer:panRec];

    UISwipeGestureRecognizer * swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipe:)];

    swipeRec.direction = UISwipeGestureRecognizerDirectionUp;
    [panedView addGestureRecognizer:swipeRec];

    [panRec requireGestureRecognizerToFail:swipeRec];



- (IBAction)handleSwipe:(UISwipeGestureRecognizer *)recognizer

    NSLog(@"In Swipe");
    if(recognizer.direction == UISwipeGestureRecognizerDirectionUp)
    
        panedView.frame =CGRectOffset( panedView.frame, 0, -1*self.view.bounds.size.height*.80);
    


- (IBAction)handlePan:(UISwipeGestureRecognizer *)recognizer

    NSLog(@"PAN");

【讨论】：

有效！为什么要去掉swipeRec.delegate = self 和panRec.delegate=self？

你可以保留这些，但我删除了它们，因为它们对于这个特定目的不是必需的。