检测屏幕UIView动画的边缘

Question

I have an UIView animation to move an object on the screen and I want the animation to be stopped (and the object to keep the position when the animation is stopped) when the object goes off the screen.

I want my object to always be visible, and to stop moving when it meets an edge of the screen. The target point may be anywhere.

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
self.MyObject.center = targetPoint;
[UIView commitAnimations];

I tried to fire a scheduled timer which check if the object is off screen but it seems that the position my object does not change.

Thanks for your help.

Answer 1

Below is the code sample if you are looking to animate the object from left to right edge of the screen.

CGRect objectFrame = self.MyObject.frame;
objectFrame.origin.x = self.view.frame.size.width-objectFrame.size.width;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
[self.MyObject setFrame:objectFrame];
[UIView commitAnimations];

Hope it helps. Cheers.