如何检测UIScrollView是滚动还是拖动

Question

当我的UIScrollView滚动或拖动时,我需要不断地知道.

Answer 1

实现这两个委托方法..

- (void)scrollViewDidScroll:(UIScrollView *)sender{
  //executes when you scroll the scrollView
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
 // execute when you drag the scrollView
}

Answer 2

更好地使用isTracking

func scrollViewDidScroll(_ scrollView: UIScrollView) {

    if scrollView.isTracking {   
    // ... 
    }
}

Answer 3

替代@ Shorhashi的解决方案:

- (void)scrollViewDidScroll:(UIScrollView *)sender{
    if(sender.isDragging) {
        //is dragging
    }
    else {
        //is just scrolling
    } 
}