iOS使用UIScorllView实现两指缩放功能

#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIScrollView *scrollView;@property (strong, nonatomic) UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {  [super viewDidLoad];  _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 {  [super didReceiveMemoryWarning];}@end