// 返回一個放大或者縮小的視圖
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
}
// 開始放大或者縮小
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:
(UIView *)view
{
}
// 縮放結(jié)束時
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{
}
// 視圖已經(jīng)放大或縮小
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidScrollToTop");
}
*/
// 是否支持滑動至頂部
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
{
return YES;
}
// 滑動到頂部時調(diào)用該方法
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidScrollToTop");
}
// scrollView 已經(jīng)滑動
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
//常用一般是這個,比如瀏覽淘寶的時候,
//有個回到頂部按鈕,向上滑動按鈕隱藏,
//向下滑動則顯示,就是調(diào)用了這個方法
NSLog(@"scrollViewDidScroll");
}
// scrollView 開始拖動
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
NSLog(@"scrollViewWillBeginDragging");
}
// scrollView 結(jié)束拖動
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
NSLog(@"scrollViewDidEndDragging");
}
// scrollView 開始減速（以下兩個方法注意與以上兩個方法加以區(qū)別）
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
NSLog(@"scrollViewWillBeginDecelerating");
}
// scrollview 減速停止
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidEndDecelerating");
}
Tip:判斷uiscrollview是向上滾動還是向下滾動
// 25 可以是任意數(shù)字，可根據(jù)自己的需要來設(shè)定。
int _lastPosition; //A variable define in headfile
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
int currentPostion = scrollView.contentOffset.y;
if (currentPostion - _lastPosition > 25) {
_lastPosition = currentPostion;
NSLog(@"ScrollUp now");
}
else if (_lastPosition - currentPostion > 25)
{
_lastPosition = currentPostion;
NSLog(@"ScrollDown now");
}
}
