不仅仅是截图--截取整个scrollView的内容

以下的方法，非常简单的实现截取整个scrollView控件及其子控件的内容，比如tableView等，并生成一张图片。不仅仅是我们可以看到的一屏大小的内容。

- (UIImage *)screenShotImageOfScrollView:(UIScrollView *)scrollView
{
    UIImage* image = nil;
   //获取图片 UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, NO, 0.0);
    {
        CGPoint savedContentOffset = scrollView.contentOffset;
        CGRect savedFrame = scrollView.frame;
        scrollView.contentOffset = CGPointZero;
        scrollView.frame = CGRectMake(0, 0, scrollView.contentSize.width, scrollView.contentSize.height);

        [scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
        image = UIGraphicsGetImageFromCurrentImageContext();

        scrollView.contentOffset = savedContentOffset;
        scrollView.frame = savedFrame;
    }
    UIGraphicsEndImageContext();

  //存储图片
    //设置图片的存储路径
    NSString *pathDocument = NSHomeDirectory();
    NSString *imagePath = [path_document stringByAppendingString:@"/Documents/abc.png"];

    [UIImagePNGRepresentation(image) writeToFile:imagePath atomically:YES];

    // 将存储的图片再取出来，然后上传
    NSString * path = imagePath;
    // 二进制的数据就可以进行上传
    NSData * data = [NSData dataWithContentsOfFile:path];
    getImage = [UIImage imageWithData:data];

    if (image != nil) {
        return image;
    }
    return nil;
}