UIScrollViewDelegate相關方法，

UIScrollViewDelegate相關方法，

UIScrollViewDelegate

 

- (void)scrollViewDidScroll:(UIScrollView *)scrollView;//scrollview 滾動的時候調用該方法,任何 offset 值改變都會調用該方法.

- (void)scrollViewDidZoom:(UIScrollView *)scrollView;//縮放的時候調用

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;//一次有效滾動(只要手指不放開,就算一次有效滾動,調用一次

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;//一次有效滾動,手指鬆開時調用一次

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;//一次有效滾動,手指離開螢幕時執行一次(decelerate指手指放開時螢幕是否繼續按慣性滾動)

 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;//滑動將要減速

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;//滾動停止

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;//滾動視圖動畫完成後調用

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;//縮放視圖

- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view;//視圖將要縮放(一次有效縮放只執行一次)

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(nullable UIView *)view atScale:(CGFloat)scale;//視圖縮放結束

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;//使用者點擊狀態列時,是否可以滾動到頂部

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView; //滾動到頂部時調用該方法

UIScrollViewAccessibilityDelegate

- (NSString *)accessibilityScrollStatusForScrollView:(UIScrollView *)scrollView;//視圖滾動的時候返回一個自訂的字串