iOS 图片点击放大封装

封装类: SJAvatarBrowser.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface SJAvatarBrowser : NSObject
// 类方法
+(void)showImage:(UIImageView *)avatarImageView;
@end

#import "SJAvatarBrowser.h"
static CGRect oldframe;
@implementation SJAvatarBrowser

+(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

调用页面

#import "ViewController.h"
#import "SJAvatarBrowser.h"
@interface ViewController ()
@property (nonatomic, strong)UIImageView *imageViews;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.imageViews = [[UIImageView alloc]init];
    self.imageViews.image = [UIImage imageNamed:@"20120322222308426.jpg"];
    self.imageViews.frame = CGRectMake((self.view.bounds.size.width - 200) / 2, 100, 200, 200);
    self.imageViews.backgroundColor = [UIColor redColor];
    self.imageViews.userInteractionEnabled = YES;
    [self.view addSubview:self.imageViews];

    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(magnifyImage)];
    [self.imageViews addGestureRecognizer:tap];
}
#pragma mark 调用图片放大功能
- (void)magnifyImage {

    NSLog(@"局部放大");
    [SJAvatarBrowser showImage:self.imageViews];
}
@end