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#pragma mark - 监听/** * 点击了顶部的标题按钮 */- (void)titleClick:(XMGTitleButton *)titleButton{ // 修改按钮状态 self.clickedTitleButton.selected = NO; titleButton.selected = YES; self.clickedTitleButton = titleButton; // 移除底部下划线 [UIView animateWithDuration:0.25 animations:^{ self.titleUnderlineView.width = titleButton.titleLabel.width; self.titleUnderlineView.centerX = titleButton.centerX; }]; // 让scrollView滚动到对应的位置(不要去修改contentOffset的y值) CGPoint offset = self.scrollView.contentOffset; offset.x = titleButton.tag * self.scrollView.width; [self.scrollView setContentOffset:offset animated:YES]; //不是人为拖拽scrollView导致滚动完毕，会调用scrollViewDidEndScrollingAnimation这个方法}#pragma mark - <UIScrollViewDelegate>/** * 滚动完毕就会调用（如果不是人为拖拽scrollView导致滚动完毕，才会调用这个方法） */- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{ int index = scrollView.contentOffset.x / scrollView.width; UIViewController *willShowChildVc = self.childViewControllers[index]; // 如果这个子控制器的view已经添加过了，就直接返回 if (willShowChildVc.isViewLoaded) return; // 添加子控制器的view willShowChildVc.view.frame = scrollView.bounds; [scrollView addSubview:willShowChildVc.view];}/** * 滚动完毕就会调用（如果是人为拖拽scrollView导致滚动完毕，才会调用这个方法） */- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ int index = scrollView.contentOffset.x / scrollView.width; // 点击对应的按钮 [self titleClick:self.titleButtons[index]]; // 添加子控制器的view [self scrollViewDidEndScrollingAnimation:scrollView];}scrollViewDidEndScrollingAnimation和scrollViewDidEndDecelerating的区别
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原文地址：http://www.cnblogs.com/stevenwuzheng/p/5781186.html
