基本使用步骤
创建一个scrollView，进行frame等常规设置，并将其添加到控制器view
UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
scrollView.backgroundColor = [UIColor grayColor];
[self.view addSubview:scrollView];`将需要展示的内容addSubView到scrollView中
UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"cao"]]; imageView.frame = CGRectMake(0, 0, imageView.image.size.width, imageView.image.size.height); [scrollView addSubview:imageView];设置scrollView的contentSize，一般比frame范围大，使scrollView可以滚动
scrollView.contentSize = CGSizeMake(imageView.frame.size.width, imageView.frame.size.height);你还可以设置scrollView的其他属性
scrollView.showsHorizontalScrollIndicator = NO; scrollView.showsVerticalScrollIndicator = NO; scrollView.contentInset = UIEdgeInsetsMake(50, 50, 50, 50); NSLog(@"%f",scrollView.contentOffset.x);
缩放手势的步骤
- 设置控制器为scrollView的代理
@interface ViewController () <UIScrollViewDelegate> scrollView.delegate = self; - 设置缩放的范围（最大比例和最小比例）
scrollView.maximumZoomScale = 2.0; scrollView.minimumZoomScale = 0.5; - 实现scrollView的代理方法，来确定scrollView内需要缩放的控件
-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { return self.imageView; }
