如何找出一个人何时将手指离开屏幕？

Question

thats pretty much all i was wondering. Anybody have a quick answer?

i want my program to do some code when the user stops scrolling and has lifted his finger up

Answer 1

you can implement the following method:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event

This will get called whenever you are lifting your finger up.

Answer 2

if you use scrollView , it is better use the delegate:

// called on finger up if the user dragged. decelerate is true if it will continue moving afterwards
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;