ScrollView常用代理方法:

#pragma mark - 滾動結束調用
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {// 計算 滑動到了第幾頁double page = scrollView.contentOffset.x / scrollView.width;self.pageControl.currentPage = (int)(page + 0.5);
}

// 只要滾動了就會調用
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {NSLog(@"ContentOffset  x is  %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y);}

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#pragma mark - 將開始降速時
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
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??? NSLog(@"開始減速了");
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}

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#pragma mark - 拖的過程 手指離開調用
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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??? NSLog(@"手指離開了");
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}

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#pragma mark - 手指開始 滑動調用
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
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??? NSLog(@"手指滑動了");
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}

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