• 放大图片


    图片点击放大,再次点击返回原视图.完美封装,一个类一句代码即可调用.IOS完美实现

    创建了一个专门用于放大图片的类,以下为.h文件

    #import 
    
    @interface SJAvatarBrowser : NSObject
    /**
     *	@brief	浏览头像
     *
     *	@param 	oldImageView 	头像所在的imageView
     */
    +(void)showImage:(UIImageView*)avatarImageView;
    
    @end

    以下为.m文件

    #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
    

    引入此类之后,为自己需要放大的imageView添加tap手势

    UITapGestureRecognizer *tap  = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(magnifyImage)];
    
        [self.imageView addGestureRecognizer:tap];
    - (void)magnifyImage
    {
        NSLog(@"局部放大");
        [SJAvatarBrowser showImage:self.imageView];//调用方法
    }

    转载请声明源地址http://blog.csdn.net/u013082522/article/details/18445901

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  • 原文地址:https://www.cnblogs.com/jx66/p/5253953.html
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