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?
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?
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;
}
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;
}
Hope this helps.