iOS使用UIScorllView实现两指缩放功能

作者：简简单单 2017-08-03

两指缩放功能不仅可以用UIPinchGestureRecognizer手势来实现，还能用UIScorllView来实现，UIScrollView可以轻松的实现最大与最小缩放值，以及滚动的效果。代码如下：

代码如下

复制代码

#import"ViewController.h"
@interfaceViewController ()
@property(weak, nonatomic) IBOutlet UIScrollView *scrollView;
@property(strong, nonatomic) UIImageView *imageView;
@end
@implementationViewController
- (void)viewDidLoad {
  [superviewDidLoad];
  _scrollView.minimumZoomScale =1.0;  // 最小缩放值
  _scrollView.maximumZoomScale =10.0; // 最大缩放值
  [_scrollView setZoomScale:_scrollView.minimumZoomScale]; // 初始时候的缩放值
  _scrollView.delegate = self;
  _imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"image"]];
  _imageView.frame = self.view.frame;
  [_scrollView addSubview:_imageView];
}
#pragma mark - 返回需要缩放的控件
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
  return_imageView;
}
- (void)didReceiveMemoryWarning {
  [superdidReceiveMemoryWarning];
}
@end