ios 截屏保存图片

//私有API，目前appstore可以审核通过了（iphone目前没问题，但是ipad会出现图片变形）
CGImageRef img = UIGetScreenImage();
    UIImage* scImage=[UIImage imageWithCGImage:img];
    UIImageWriteToSavedPhotosAlbum(scImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);

　下面这种截图，保存上下文（如果是yuv视频数据是无法直接保存，方法：视频数据时，可以采用yuv转换RGB在转换UIImage）　

UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];
UIGraphicsBeginImageContext(screenWindow.frame.size);
[screenWindow.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);

　　

判断是否截图成功

- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
    if (error)
    {
        strStatus = Localized(@"Save failed");
    }
    else
    {
        strStatus = Localized(@"Save success");
    }
}