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第一次UITouch开始和UITouch移动导致代理被正确调用。但是在将 a 添加UIPanGestureRecognizer到视图之后,只UITouch调用了 begin ,但UITouch没有调用 move 。
UITouch
UIPanGestureRecognizer
您可能需要添加“gestureRecognizer.cancelsTouchesInView=NO;” 继续在您的视图上接收触摸事件。