ios – 打印屏幕内容的UITableView？

嗨,我有一个iOS应用程序,可以打印UITableView.但是,仅打印显示的tableview的一部分.有没有办法打印整个tableview,即使它还没有被绘制？

这是我用来打印的代码：

UIGraphicsBeginImageContext(self.mainTableView.contentSizE);
[self.mainTableView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

UIPrinTinteractionController *printer = [UIPrinTinteractionController sharedPrintController];
printer.prinTingItem = viewImage;
UIPrinTinfo *info = [UIPrinTinfo prinTinfo];
printer.prinTinfo = info;
UIPrinTinteractionCompletionHandler completionHandler =
^(UIPrinTinteractionController *pic,BOOL completed,NSError *error) {
    if (!completed && error)
        NSLog(@"Failed! due to error in domain %@ with error code %u: %@",error.domain,error.code,[error localizedDescription]);
}; 
UIButton * printButton = (UIButton *)sender;
if(UIUserInterfaceI@L_288_5@mPad == [[UIDevice currentDevice] userInterfaceI@L_288_5@m]){
    [printer presentFromRect:printButton.frame inView:self.view animated:YES completionHandler:completionHandler];
} else {
    [printer presentAnimated:YES completionHandler:completionHandler];
}