ONLongPressGesture to Touches Moved in subview

Posted 2023-02-27

【中文标题】ONLongPressGesture to Touches Moved in subview

【英文标题】：UILongPressGesture to Touches Moved in subview

【发布时间】：2013-08-16 13:48:08

【问题描述】：

我有一个UIViewController 并添加了一个UILongPressGestureRecognizer，当它被识别时会在顶部添加一个覆盖UIViewController 的子视图，并将印刷机的坐标传递给子视图并添加印刷机所在的图像。

我现在需要做的是移动用户拇指所在的子视图。我已经在UIView 中实现了touchesMoved，但是直到您移除手势并按下并重新开始后才会注册？

如何在添加 UIView 后立即开始 touchesBegan 而无需删除并重新开始？

谢谢 -JM

【参考方案1】：

为什么不继续使用 UILongPressGesture？

    - (IBAction)longPressGestureStateChanged:(UILongPressGestureRecognizer *)sender 
        switch (sender.state) 
            case UIGestureRecognizerStatePossible:
            case UIGestureRecognizerStateBegan: 
            /* PUT YOUR IMAGE HERE */
            break;
        
        case UIGestureRecognizerStateChanged: 
            /* MOVE YOUR IMAGE HERE */
            self.myImageView.center = [sender locationInView:self.view /* or any of your subviews */];
            break;
        
        case UIGestureRecognizerStateCancelled:
        case UIGestureRecognizerStateFailed:
        case UIGestureRecognizerStateEnded: 
            /* REMOVE OR PROCESS END OF THIS TOUCH GESTURE */
            break;