设置scrollview.canCancelContentTouches为NO，当内容视图开始跟踪触摸时，如果用户手指拖动足以启动滚动，子视图会收到touchesCancelled消息，而scrollView将处理为滚动操作。此属性在iOS 2.0及以后版本中可用。
scrollview.canCancelContentTouches=NO;
A Boolean value that controls whether touches in the content view always lead to tracking.
@property(nonatomic) BOOL canCancelContentTouches
Discussion
If the value of this property is YES and a view in the content has begun tracking a finger touching it, and if the user drags the finger enough to initiate a scroll, the view receives a touchesCancelled:withEvent: message and the scroll view handles the touch as a scroll. If the value of this property is NO, the scroll view does not scroll regardless of finger movement once the content view starts tracking.
Availability
- Available in iOS 2.0 and later.
Declared In
UIScrollView.h
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