在此，封裝了一個類，外面用的話直接呼叫方法，即可實現想要的效果。但是有一點，點進去之後只能檢視對應的一張圖，不能滑動，如果想要更多的效果，自己在此基礎上進行再封裝吧。只做參考。程式碼如下：

.h檔案中：

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface SJAvatarBrowser : NSObject

+(void)showImage:(UIImageView *)avatarImageView;

#import "SJAvatarBrowser.h"

staticCGRect oldframe;

@implementation SJAvatarBrowser

+(void)showImage:(UIImageView *)avatarImageView{

UIImage *image=avatarImageView.image;

UIWindow *window=[UIApplicationsharedApplication].keyWindow;

UIView *backgroundView=[[UIViewalloc]initWithFrame:CGRectMake(0, 0, [UIScreenmainScreen].

oldframe=[avatarImageView convertRect:avatarImageView.boundstoView:window];

    backgroundView.backgroundColor=[UIColorblackColor];

    backgroundView.alpha=0;

UIImageView *imageView=[[UIImageViewalloc]initWithFrame:oldframe];

    imageView.

    imageView.tag=1;

    [backgroundView addSubview:imageView];

    [window addSubview:backgroundView];

UITapGestureRecognizer *tap=[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(hideImage:)];

    [backgroundView addGestureRecognizer: tap];

    [UIViewanimateWithDuration:0.3animations:^{

        imageView.frame=CGRectMake(0,([UIScreenmainScreen].bounds.size.height-image.size.height*[UIScreenmainScreen].bounds.size.width/image.size.width)/2, [UIScreenmainScreen].bounds.size.width, image.size.height*[UIScreenmainScreen].bounds.size.width/image.size.width);

        backgroundView.alpha=1;

    } completion:^(BOOL finished) {

    }];

}

+(void)hideImage:(UITapGestureRecognizer*)tap{

UIView *backgroundView=tap.view;

UIImageView *imageView=(UIImageView*)[tap.viewviewWithTag:1];

    [UIViewanimateWithDuration:0.3animations:^{

        imageView.frame=oldframe;

        backgroundView.alpha=0;

    } completion:^(BOOL finished) {

        [backgroundView removeFromSuperview];

    }];

}

////////////////////////////////

在此，一個封裝好的類，已經結束。下面以ViewController為例，來說明：

#import "ViewController.h"

#import "SJAvatarBrowser.h"

@interfaceViewController () {

UIImageView *_imageView;

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

UIImageView *imageView = [[UIImageViewalloc] init];

    imageView.frame = CGRectMake(100, 100, 300, 300);

    imageView.image = [UIImageimageNamed:@"4.jpg"];

    imageView.userInteractionEnabled = YES;

    [self.viewaddSubview:imageView];

_imageView = imageView;

UITapGestureRecognizer *tap  = [[UITapGestureRecognizeralloc] initWithTarget:selfaction:@selector(magnifyImage:)];

    [imageView addGestureRecognizer:tap];

}

- (void)magnifyImage:(UITapGestureRecognizer *)gesture {

NSLog(@"版權所有，違者必究，Q_Q33757152的部落格");

    [SJAvatarBrowser showImage:_imageView];//呼叫方法

}