Question

我有两个ViewController。第一个ViewController有一个TableView。我以编程方式呈现第二个ViewController。在第二个ViewController中，我下载了一个图像。现在我在完成下载后关闭第二个ViewController。同时我想用图像更新TableView并选择特定的单元格。

我使用委托来完成这个过程。但它无法更新TableView。

我使用viewDidAppear，viewWillAppear方法重新加载TableView。但没有效果。

有人建议我完成这项具体任务吗？

我通过这种方式展示了我的第二个ViewController：

ImageSelectionViewController *viewController= [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"modal"];
viewController.modalPresentationStyle = UIModalPresentationCustom;
viewController.carDownloadName = [self.listOfItem objectAtIndex:sender.tag];

[self presentViewController:viewController animated:YES completion:nil];

并通过这种方式解除ViewController：

[self dismissViewControllerAnimated:YES completion:nil];

Answer 1

你可以使用dismiss block

[self dismissViewControllerAnimated：YES completion：^ {

=IF([Month (Calculated)]="1", "January","No date")
=IF([Month (Calculated)]="2", "February","No date")
=IF([Month (Calculated)]="3", "March","No date")
=IF([Month (Calculated)]="4", "April","No date")
=IF([Month (Calculated)]="5", "May","No date")
=IF([Month (Calculated)]="6", "June","No date")
=IF([Month (Calculated)]="7", "July","No date")
=IF([Month (Calculated)]="8", "August","No date")
=IF([Month (Calculated)]="9", "September","No date")
=IF([Month (Calculated)]="10", "October","No date")
=IF([Month (Calculated)]="11", "November","No date")
=IF([Month (Calculated)]="12", "December","No date")

Answer 2

要发送UIImage，请在ViewControllerA中执行以下操作：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    let viewControllerB = segue.destinationViewController as! ViewControllerB
    viewControllerB.callback = { message in
        //Do what you want in here!
    }
}

在ViewControllerB中：

var callback : (String -> Void)?
@IBAction func done(sender: AnyObject) {
    callback?("Hi")
    self.dismissViewControllerAnimated(true, completion: nil)
}

在以编程方式模拟呈现的UIViewController解除后重新加载UITableView

2 个答案: