[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：

 //
 //  ViewController.m
 //  ImageZoom
 //
 //  Created by hellovoidworld on 14/11/28.
 //  Copyright (c) 2014年 hellovoidworld. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController ()

 // 图片控件
 @property (weak, nonatomic) IBOutlet UIImageView *imageView;

 // UIScrollView控件
 @property (weak, nonatomic) IBOutlet UIScrollView *scrollView;

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

     self.scrollView.contentSize = CGSizeMake(, );
     self.scrollView.delegate = self;

     self.scrollView.maximumZoomScale = 2.0;
     self.scrollView.minimumZoomScale = 0.1;

 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
      NSLog(@"开始拖曳");
 }

 - (void)scrollViewDidScroll:(UIScrollView *)scrollView {
     NSLog(@"正在拖曳");
 }

 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
     NSLog(@"结束拖曳");
 }

 // 缩放手势调用的方法
 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {
     return self.imageView; // 需要放大的ImageView
 }

 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view {
     NSLog(@"开始缩放");
 }

 - (void)scrollViewDidZoom:(UIScrollView *)scrollView {
     NSLog(@"正在缩放");
 }

 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale {
     NSLog(@"结束缩放");
 }

 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {
     NSLog(@"拖曳完成后减速开始");
 }

 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
     NSLog(@"拖曳完成后减速完成");
 }

 @end