ios截屏事件监听

目的:实现截屏反馈,类似支付宝的截屏上传反馈功能.

1.注册全局通知,在Appdelegate中注册截屏监听通知

- (void)registNotification{
    
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getScreenshot:) name:UIApplicationUserDidTakeScreenshotNotification object:nil];
   
}

　　

2.实现通知

- (void)getScreenshot:(NSNotification *)notification{
    NSLog(@"捕捉截屏事件");
    UIImage *shorImg =  [UIImage imageWithData:[self imageDataScreenShot]];

}

　　

- (NSData *)imageDataScreenShot
{
    CGSize imageSize = CGSizeZero;
    imageSize = [UIScreen mainScreen].bounds.size;
    
    UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    for (UIWindow *window in [[UIApplication sharedApplication] windows])
    {
        CGContextSaveGState(context);
        CGContextTranslateCTM(context, window.center.x, window.center.y);
        CGContextConcatCTM(context, window.transform);
        CGContextTranslateCTM(context, -window.bounds.size.width * window.layer.anchorPoint.x, -window.bounds.size.height * window.layer.anchorPoint.y);
        if ([window respondsToSelector:@selector(drawViewHierarchyInRect:afterScreenUpdates:)])
        {
            [window drawViewHierarchyInRect:window.bounds afterScreenUpdates:YES];
        }
        else
        {
            [window.layer renderInContext:context];
        }
        CGContextRestoreGState(context);
    }
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return UIImagePNGRepresentation(image);
}