1     //在设置最大滚动距离时 一般用到最后一个控件的最大Y值 或 X值 CGRectGetMaxX 2     //点进去浏览,分别有最大最小x,最大最小y,最大最小中点(CGRectMidX ....MidY) 3     CGFloat maxY = CGRectGetMaxY(self.lastBtn.frame) + 10; 4     //设置滚动区域,x=0时只能上下滚动,y=0时左右滚动 5     self.scrollView.contentSize = CGSizeMake(0, maxY); 6     self.scrollView.delegate = self; 7     //设置额外的滚动区域{top, left, bottom, right} 8     self.scrollView.contentInset = UIEdgeInsetsMake(64, 0, 44, 0); 9     //设置默认滚动位置(启动时停留在哪个位置)10     self.scrollView.contentOffset = CGPointMake(0, -64);

 1 //只要滚动了就会触发 2 - (void)scrollViewDidScroll:(UIScrollView *)scrollView;    3 { 4 //     NSLog(@" scrollViewDidScroll"); 5         NSLog(@"ContentOffset  x is  %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y); 6 } 7 //开始拖拽视图 8 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;    9 {10    NSLog(@"scrollViewWillBeginDragging");11 }12 //完成拖拽13 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate; 14 {15    NSLog(@"scrollViewDidEndDragging");16 }17 //将开始降速时18 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;   19 {20    NSLog(@"scrollViewWillBeginDecelerating");21 }22 23 //减速停止了时执行，手触摸时执行24 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;   25 {26    NSLog(@"scrollViewDidEndDecelerating");27 }28 //滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时29 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;30 {31    NSLog(@"scrollViewDidEndScrollingAnimation");32 }33 //设置放大缩小的视图，要是uiscrollview的subview34 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;   35 {36    NSLog(@"viewForZoomingInScrollView");37     return viewA;//这里返回一个view.告诉代理将要对哪个view操作38 }39 //完成放大缩小时调用40 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale; 41 {42     viewA.frame=CGRectMake(50,0, 100, 400);43    NSLog(@"scale between minimum and maximum. called after any ‘bounce‘ animations");44 }// scale between minimum and maximum. called after any ‘bounce‘ animations45 46 //如果你不是完全滚动到滚轴视图的顶部，你可以轻点状态栏，那个可视的滚轴视图会一直滚动到顶部，那是默认行为，你可以通过该方法返回NO来关闭它47 - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;   48 {49     NSLog(@"scrollViewShouldScrollToTop");50    return YES;51 }52 53 - (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;     54 {55     NSLog(@"scrollViewDidScrollToTop");
　　}