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iOS

Posted by Alex Puray
Alex Puray
1,304 Points

Pan Gesture Screen Boundaries.

Hello, I have loaded the pan gesture programmatically with a Uiimage. How do I restrict that image within the boundaries of the screen? here the code I am currently using . 

 - (IBAction)didPan:(UIPanGestureRecognizer *)panGestureRecognizer {
    CGPoint translation = [panGestureRecognizer translationInView:_blue.superview];
    _blue.center = CGPointMake(_blue.center.x + translation.x,_blue.center.y + translation.y);

    [panGestureRecognizer setTranslation:CGPointZero inView:_blue.superview];


}

2 Answers

Sam Soffes
STAFF
Sam Soffes
Treehouse Guest Teacher
Sam Soffes
Sam Soffes
Treehouse Guest Teacher

Alex,

Give your gesture recognizer a delegate. There's a method for should receive touch. You can just return YES or NO if the touch is in the frame you're looking for. Use CGRectContainsPoint to make the math easy :)

Alex Puray
Alex Puray
1,304 Points
Alex Puray
Alex Puray
1,304 Points

Is there anyway you could provide me with an example? Having a lot of trouble on this.