1 #import "ViewController.h"
2 #import <UIKit/UIMenuController.h>
3
4 @interface ViewController ()<UIScrollViewDelegate>
5 @property (strong, nonatomic) UIScrollView *scrView;
6
7 @property (nonatomic,strong)UIImageView *imgv;
8 @end
9
10 @implementation ViewController
11
12 - (void)viewDidLoad {
13 [super viewDidLoad];
14 //[[UILabel appearance] setTextColor:[UIColor yellowColor]];
15 self.scrView = [[UIScrollView alloc]initWithFrame:self.view.bounds];
16 self.scrView.contentSize = CGSizeMake(800, 1800);
17 self.scrView.backgroundColor = [UIColor yellowColor];
18 [self.view addSubview:self.scrView];
19
20
21 // 设置放大缩小的比例
22 self.scrView.multipleTouchEnabled = YES;//打开多指触控
23 self.scrView.maximumZoomScale = 2.0;
24 self.scrView.minimumZoomScale = 0.5;
25 self.scrView.zoomScale = 3.0;
26
27 self.scrView.delegate = self;
28
29 UIImageView *imgv = [[UIImageView alloc]initWithFrame:CGRectMake(150, 150, 150, 150)];
30 imgv.backgroundColor = [UIColor grayColor];
31 [self.scrView addSubview:imgv];
32 self.imgv = imgv;
33
34 }
35
36 // *** 必须实现的代理方法
37
38 -(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView{
39 return self.imgv;
40 }
41 // ***是图片保持位于视图中心
42
43 -(void)scrollViewDidZoom:(UIScrollView *)scrollView{
44 self.imgv.center = self.view.center;
45 }
