如何檢測UIScrollView正在滾動還是正在拖動

Question

當我的UIScrollView正在滾動或拖動時，我需要持續瞭解這些信息。

Answer 1

實現這兩個委託方法..

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

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

Answer 2

替代@ Shorhashi的解決方案：

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

Answer 3

更好地利用isTracking

func scrollViewDidScroll(_ scrollView: UIScrollView) { 

    if scrollView.isTracking == true { 
    // ... 
    } 
}