UIScrollView并取消缩放捏合手势 [英] UIScrollView and cancel a zooming pinch gesture
问题描述
如何强行取消 UIScrollView
上的缩放开放捏动手势,例如当用户足够缩放以触发新动作时?
How do you forcibly cancel a zooming open pinch gesture on a UIScrollView
, say when the user has zoomed "sufficiently" far to trigger a new action?
推荐答案
为了防止用户控制器缩放和平移但仍然允许滚动视图的编程缩放和平移,最好的方法是覆盖 UIScrollView的
- addGestureRecognizer
:子类中的方法。
To prevent user-controller zooming and panning but still allow programmatic zooming and panning of a scrollview, the best approach is to override the UIScrollView's
-addGestureRecognizer
: method in a subclass.
-(void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
{
//Prevent any of the default panning and zooming controls from working
gestureRecognizer.enabled = NO;
[super addGestureRecognizer:gestureRecognizer];
return;
}
每个手势识别器都被禁用,以便更好地控制(例如,允许平移控制,但仅允许通过双击进行缩放)您只需通过 -isKindOfClass:
检查传入的手势识别器并根据需要禁用。
Each gesture recognizer is simply disabled, for finer control (for ex. allowing the pan control but only allow zooming via a double tap for instance) you'd simply check the incoming gesture recognizer via -isKindOfClass:
and disabling as appropriate.
-(void)addGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
{
//Prevent zooming but not panning
if ([gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]])
{
gestureRecognizer.enabled = NO;
}
[super addGestureRecognizer:gestureRecognizer];
return;
}
希望这有帮助。
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