[iOS基础控件 - 5.2] 查看大图、缩放图片代码(UIScrollView制作)
原图: 900 x 1305
拖曳滚动：
缩放:
主要代码：
1 // 2 // ViewController.m 3 // ImageZoom 4 // 5 // Created by hellovoidworld on 14/11/28. 6 // Copyright (c) 2014年 hellovoidworld. All rights reserved. 7 // 8 9 #import "ViewController.h" 10 11 @interface ViewController () 12 13 // 图片控件 14 @property (weak, nonatomic) IBOutlet UIImageView *imageView; 15 16 // UIScrollView控件 17 @property (weak, nonatomic) IBOutlet UIScrollView *scrollView; 18 19 @end 20 21 @implementation ViewController 22 23 - (void)viewDidLoad { 24 [super viewDidLoad]; 25 // Do any additional setup after loading the view, typically from a nib. 26 27 self.scrollView.contentSize = CGSizeMake(900, 1305); 28 self.scrollView.delegate = self; 29 30 self.scrollView.maximumZoomScale = 2.0; 31 self.scrollView.minimumZoomScale = 0.1; 32 33 } 34 35 - (void)didReceiveMemoryWarning { 36 [super didReceiveMemoryWarning]; 37 // Dispose of any resources that can be recreated. 38 } 39 40 41 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { 42 NSLog(@"开始拖曳"); 43 } 44 45 - (void)scrollViewDidScroll:(UIScrollView *)scrollView { 46 NSLog(@"正在拖曳"); 47 } 48 49 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate { 50 NSLog(@"结束拖曳"); 51 } 52 53 54 // 缩放手势调用的方法 55 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView { 56 return self.imageView; // 需要放大的ImageView 57 } 58 59 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view { 60 NSLog(@"开始缩放"); 61 } 62 63 - (void)scrollViewDidZoom:(UIScrollView *)scrollView { 64 NSLog(@"正在缩放"); 65 } 66 67 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale { 68 NSLog(@"结束缩放"); 69 } 70 71 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView { 72 NSLog(@"拖曳完成后减速开始"); 73 } 74 75 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView { 76 NSLog(@"拖曳完成后减速完成"); 77 } 78 79 @end 80
