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一. 实现的效果类似微博的截图分享

不仅截图分享的时候还进行图片的修改,增加自己的二维码

二.实现方式

苹果在ios7之后提供了一个新的通知类型：UIApplicationUserDidTakeScreenshotNotification，

这个通知会告知注册了此通知的对象已经发生了截屏事件，然后我们就可以在这个事件中实现自己的逻辑

1.注册通知

- void)viewDidLoad {
    [super viewDidLoad];
    //注册用户的截屏操作通知
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selectoruserDidTakeScreenshot:)
                                                 name:UIApplicationUserDidTakeScreenshotNotification object:nil];
}

2.接收通知 获取截图并修改的图片,并展示,展示UI,可以自己修改)

//截屏响应
- void)userDidTakeScreenshot:NSNotification *)notification
{
    NSLog@"检测到截屏");
    
    //人为截屏, 模拟用户截屏行为, 获取所截图片
    _testImg = [self imageWithScreenshot];
    
    
//    //添加显示
    UIImageView *imgvPhoto = [[UIImageView alloc]initWithImage:_testImg];
    imgvPhoto.frame = CGRectMake0, WIN_HEIGHT/2, WIN_WIDTH/2, WIN_HEIGHT/2);
    imgvPhoto.backgroundColor = [UIColor orangeColor];
    imgvPhoto.userInteractionEnabled = YES;
    //添加边框
    CALayer * layer = [imgvPhoto layer];
    layer.borderColor = [[UIColor whiteColor] CGColor];
    layer.borderWidth = 5.0f;
    //添加四个边阴影
    imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    imgvPhoto.layer.shadowOffset = CGSizeMake0, 0);
    imgvPhoto.layer.shadowOpacity = 0.5;
    imgvPhoto.layer.shadowRadius = 10.0;
    //添加两个边阴影
    imgvPhoto.layer.shadowColor = [UIColor blackColor].CGColor;
    imgvPhoto.layer.shadowOffset = CGSizeMake4, 4);
    imgvPhoto.layer.shadowOpacity = 0.5;
    imgvPhoto.layer.shadowRadius = 2.0;
    
    [self.view  addSubview:imgvPhoto];
    
    // 添加手势
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selectortapImgView:)];
    [imgvPhoto addGestureRecognizer:tap];
}

3. 截图并修改图片

/**
 *  截取当前屏幕 并修改
 *
 *  @return NSData *
 */
- UIImage *)imageWithScreenshot
{
    CGSize imageSize = CGSizeZero;
    UIInterfaceOrientation orientation = [UIApplication sharedApplication].statusBarOrientation;
    if UIInterfaceOrientationIsPortraitorientation))
        imageSize = [UIScreen mainScreen].bounds.size;
    else
        imageSize = CGSizeMake[UIScreen mainScreen].bounds.size.height, [UIScreen mainScreen].bounds.size.width);
    
    UIGraphicsBeginImageContextWithOptionsimageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext);
    for UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        CGContextSaveGStatecontext);
        CGContextTranslateCTMcontext, window.center.x, window.center.y);
        CGContextConcatCTMcontext, window.transform);
        CGContextTranslateCTMcontext, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
        if orientation == UIInterfaceOrientationLandscapeLeft)
        {
            CGContextRotateCTMcontext, M_PI_2);
            CGContextTranslateCTMcontext, 0, -imageSize.width);
        }else if orientation == UIInterfaceOrientationLandscapeRight)
        {
            CGContextRotateCTMcontext, -M_PI_2);
            CGContextTranslateCTMcontext, -imageSize.height, 0);
        } else if orientation == UIInterfaceOrientationPortraitUpsideDown) {
            CGContextRotateCTMcontext, M_PI);
            CGContextTranslateCTMcontext, -imageSize.width, -imageSize.height);
        }
        if [window respondsToSelector:@selectordrawViewHierarchyInRect:afterScreenUpdates:)])
        {
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        }
        else
        {
            [window.layer renderInContext:context];
        }
        CGContextRestoreGStatecontext);
    }
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext);
    UIGraphicsEndImageContext);
    
    // 修改图片
    NSData *imageData = UIImagePNGRepresentationimage);
    UIImage *LastImage = [UIImage imageWithData:imageData];
    
    UIImage *img = [UIImage imageNamed:@"ico_nursery.png"];
    CGImageRef imgRef = img.CGImage;
    CGFloat w = CGImageGetWidthimgRef);
    CGFloat h = CGImageGetHeightimgRef);
    
    //以1.png的图大小为底图
    UIImage *img1 = LastImage;
    CGImageRef imgRef1 = img1.CGImage;
    CGFloat w1 = CGImageGetWidthimgRef1);
    CGFloat h1 = CGImageGetHeightimgRef1);
    
    //以1.png的图大小为画布创建上下文
    UIGraphicsBeginImageContextCGSizeMakew1, h1 + 100));
    [img1 drawInRect:CGRectMake0, 0, w1, h1)];//先把1.png 画到上下文中
    [img drawInRect:CGRectMake10, h1 + 10, 80, 80)];//再把小图放在上下文中
    UIImage *resultImg = UIGraphicsGetImageFromCurrentImageContext);//从当前上下文中获得最终图片
    UIGraphicsEndImageContext);//关闭上下文
    
    return  resultImg;
}

4.根据添加的事件进行分享 分享自己也可封装

// 点击图片改变imageView位置,打印图片信息  分享自己也可封装
- void)tapImgView: UITapGestureRecognizer *)tap {
    
    NSLog@"点击了图片...");
 // 微信
    [MyAPIClient mobEvent:@"wechat"];
//  [Helper shareImageName:_testImg type:SSDKPlatformSubTypeWechatSession];//  微信好友
    [Helper shareImageName:_testImg type:SSDKPlatformSubTypeWechatTimeline];// 微信朋友圈
// QQ
//    [MyAPIClient mobEvent:@"QQ"];
//    [Helper shareImageName:_testImg type:SSDKPlatformTypeQQ];// QQ
    
}

5. 移除通知

- void)dealloc
{
    [[NSNotificationCenter defaultCenter]removeObserver:self];
}

这样就可以了.展示一下测试

自身截图

截图修改分享图

ok,结束,需要补充的,欢迎大家留言讨论!