UItableView 所有内容保存为图片

将所有的UITableView保存为图片，因为UITableView只能保存显示当前，所以，就单个保存后，合并为一张图片

代码如下：

-(IBAction)savePic:(id)sender
 
{
 
    //支持retian高分辨率
 
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, YES, 0.0);
 
    float curH = mTableView.contentSize.height;
 
    UIImageView *allView = [[UIImageView alloc]initWithFrame:CGRectMake(, , , curH)];
 
    for (float f = ; f < curH; f+=)
 
    {
 
        mTableView.contentOffset = CGPointMake(, f);
 
            [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
 
        UIImageView *imgV = [[UIImageView alloc]initWithImage:UIGraphicsGetImageFromCurrentImageContext()];
 
        imgV.frame = CGRectMake(, f, , );
 
        [allView addSubview:imgV];
 
        [imgV release];
 
    }
 
    UIGraphicsEndImageContext();
 
    //保存图片
 
   UIGraphicsBeginImageContextWithOptions(allView.frame.size, YES, 0.0);
 
    [allView.layer renderInContext:UIGraphicsGetCurrentContext()];
 
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
 
    UIGraphicsEndImageContext();
 
    [allView release];
 
    [UIImagePNGRepresentation(img) writeToFile:@"/users/test/desktop/font.png" atomically:YES];
 
}