点击图片变大

封装一个类

BigImageView.h

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@interface BigImageView : NSObject

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

@end

BigImageView.m

#import "BigImageView.h"

static CGRect oldframe;

@implementation BigImageView

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

    UIImage *image=avatarImageView.image;

    UIWindow *window=[UIApplication sharedApplication].keyWindow;

    UIView *backgroundView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height)];

    oldframe=[avatarImageView convertRect:avatarImageView.bounds toView:window];

    backgroundView.backgroundColor=[UIColor blackColor];

    backgroundView.alpha=0;

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

    imageView.image=image;

    imageView.tag=1;

    [backgroundView addSubview:imageView];

    [window addSubview:backgroundView];

    

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

    [backgroundView addGestureRecognizer: tap];

    

    [UIView animateWithDuration:0.3 animations:^{

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

        backgroundView.alpha=1;

    } completion:^(BOOL finished) {

        

    }];

}

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

    UIView *backgroundView=tap.view;

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

    [UIView animateWithDuration:0.3 animations:^{

        imageView.frame=oldframe;

        backgroundView.alpha=0;

    } completion:^(BOOL finished) {

        [backgroundView removeFromSuperview];

    }];

}

@end

在需要的controller或者cell里面调用

- (void)viewDidLoad {

    [super viewDidLoad];

    self.imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];

    self.imageView.userInteractionEnabled = YES;

    

    UITapGestureRecognizer *singleTap =

    

    [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(bigImageAction:)];

    

    [self.imageView addGestureRecognizer:singleTap];

    

    [self.imageView setImage:[UIImage imageNamed:@"back2.jpg"]];

    

    

    [self.view addSubview: _imageView];

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

}

- (void)bigImageAction:(UITapGestureRecognizer *)tap {

    [BigImageView showImage:self.imageView];

    

}