iOS图片查看，UIScrollView，放大，缩小，单机和双击

////  ImageVC.h//  MovieCrowdfunding////  Created by Sun－Mac on 2016/11/1.//  Copyright © 2016年  All rights reserved.//#import@interface ImageVC : UIViewController

@property(strong,nonatomic)NSURL *imageURL;//创建vc对象之后要传imageURL

@end

//

//  ImageVC.m

//  MovieCrowdfunding

//

//  Created by Sun－Mac on 2016/11/1.

//  Copyright © 2016年 . All rights reserved.

//

#import "ImageVC.h"

@interface ImageVC ()

{

UIScrollView *scrollView;

UIImageView *imageView;

}

@end

@implementation ImageVC

- (void)viewDidLoad

{

[super viewDidLoad];

self.view.backgroundColor = [UIColor blackColor];

scrollView=[[UIScrollView alloc]initWithFrame:self.view.bounds];

scrollView.maximumZoomScale=5.0;//图片的放大倍数

scrollView.minimumZoomScale=1.0;//图片的最小倍率

scrollView.contentSize=CGSizeMake(self.view.bounds.size.width, self.view.bounds.size.height);

scrollView.delegate=self;

imageView=[[UIImageView alloc]initWithFrame:self.view.bounds];

[imageView setImageWithURL:self.imageURL placeholderImage:[UIImage imageNamed:@"1"]];

[scrollView addSubview:imageView];

[self.view addSubview:scrollView];

imageView.userInteractionEnabled=YES;//注意:imageView默认是不可以交互,在这里设置为可以交互

UITapGestureRecognizer *tap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapImage:)];

tap.numberOfTapsRequired=1;//单击

tap.numberOfTouchesRequired=1;//单点触碰

[imageView addGestureRecognizer:tap];

UITapGestureRecognizer *doubleTap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(doubleTap:)];

doubleTap.numberOfTapsRequired=2;//避免单击与双击冲突

[tap requireGestureRecognizerToFail:doubleTap];

[imageView addGestureRecognizer:doubleTap];

imageView.contentMode=UIViewContentModeScaleAspectFit;

}

-(UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView  //委托方法,必须设置  delegate

{

return imageView;//要放大的视图

}

-(void)doubleTap:(id)sender

{

scrollView.zoomScale=2.0;//双击放大到两倍

}

- (IBAction)tapImage:(id)sender

{

[self dismissViewControllerAnimated:YES completion:nil];//单击图像,dismissViewController

}

@end