//contentSize、contentInset和contentOffset 是 scrollView三个基本的属性。
// 滚动
self.ScrollView.contentSize =self.imageview.frame.size;
//偏移X =0  Y  =-74 向下偏移
self.ScrollView.contentOffset =CGPointMake(0,-74);
// 边距 距离顶部74 左 0  下40 右0
self.ScrollView.contentInset = UIEdgeInsetsMake(74, 0, 40, 0);//不显示水平滚动条self.ScrollView.showsHorizontalScrollIndicator =NO;//不显示垂直滚动条self.ScrollView.showsVerticalScrollIndicator =NO;
//控制器 实现 UIScrollViewDelegate 代理
@interface ViewController () <UIScrollViewDelegate>
//只要滚动了就会触发
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;
{
//    NSLog(@" scrollViewDidScroll");NSLog(@"ContentOffset  x is  %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y);
}
//开始拖拽视图
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
{NSLog(@"scrollViewWillBeginDragging");
}
//完成拖拽
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
{NSLog(@"scrollViewDidEndDragging");
}
//将开始降速时
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;
{NSLog(@"scrollViewWillBeginDecelerating");
}//减速停止了时执行，手触摸时执行执行
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;
{NSLog(@"scrollViewDidEndDecelerating");
}
//滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;
{NSLog(@"scrollViewDidEndScrollingAnimation");
}
//设置放大缩小的视图，要是uiscrollview的subview
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView;
{//返回要缩放的子控件，每次只能缩放一个子控件return imageView;
}
//完成放大缩小时调用
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale;
{NSLog(@"完成放大缩小时调用");
}//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
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;
{NSLog(@"scrollViewShouldScrollToTop");return YES;
}- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;
{NSLog(@"scrollViewDidScrollToTop");
}
-(void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
{NSLog(@"用户开始缩放时调用！！scrollViewWillBeginZooming");
}
-(void)scrollViewDidZoom:(UIScrollView *)scrollView
{NSLog(@"用户正在缩放调用！scrollViewDidZoom");
}