I want to know if there is a way to restrict the size or movements of the UIViews in the GestureRecognizers. Sure I could write my own restriction code but wana know if we can set some property or something to have some bound limits.
For example in UIPanGestureRecognizer I want to restrict the movement of the view added to PanGesture within a particular CGRect, so is there any way I can set that bounding rect so on sensing PanGesture if the view is going out of my bounding frame it wont allow it.
Source: Tips4all, CCNA FINAL EXAM
as far as I am aware you have to write that yourself.
ReplyDeletetap gestures let you set how many taps you are responding to with how many fingers, but most of them do not provide a lot of helpers.
I think the simplest way to accomplish this is to create an invisible view in that rect and add the gesture to it.
ReplyDeleteExample:
You want to detect the movement in view X inside the rect {a,b,c,d}.
Create a UIView Y in the {a,b,c,d} rect. Set it's background color to clearColor.
Create the gesture recognizer and add it to the Y view.
In the gesture's selector do something like this:
- (void) selector:(UIPanGestureRecognizer *) gesture
{
UIView *viewX = [self.view viewWithTag:kTagViewX];
//now you know that the gesture took place and you have access to your view
}
If you need to change the rect in which you want the gesture to be active , just move the Y view and voila!