无论如何,Ashley Smart(
How to detect when a UIScrollView has finished scrolling)提出的Obj-C中的这个问题是一个很好的解决方案.
-(void)scrollViewDidScroll:(UIScrollView *)sender
{
[NSObject cancelPrevIoUsPerformRequestsWithTarget:self];
//ensure that the end of scroll is fired.
[self performSelector:@selector(scrollViewDidEndScrollingAnimation:) withObject:nil afterDelay:0.3];
...
}
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
{
[NSObject cancelPrevIoUsPerformRequestsWithTarget:self];
...
}
但是,我需要一个解决方案,在Swift中.
似乎Matt(dispatch_after – GCD in swift?)提供的优秀延迟功能可能会有所帮助.
func delay(delay:Double,closure:()->()) {
dispatch_after(
dispatch_time(
DISPATCH_TIME_NOW,Int64(delay * Double(NSEC_PER_SEC))
),dispatch_get_main_queue(),closure)
}
并实施为……
delay(0.4) {
// do stuff
}
但我还是没把它放在一起.有帮助吗？
解决方法
委托方法告诉您何时完成
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
println("Scroll finished")
}
