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];

}