[iOS基础控件

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(900, 1305);
    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