Uialtertview -> Insert String -> Segue 怎么样？

Question

我正在尝试执行此序列

点击按钮
显示带有文本字段的 UiAltertView
按确定
在另一个视图中复制通过键盘插入的文本

我的实际代码没有segue，我不明白为什么这是 uialertview 出现时我从输出中得到的：

Game1[615:11540] <UIView: 0x798c1d20; frame = (0 0; 320 480); autoresize = W+H; layer = <CALayer: 0x798ca5f0>>'s window is not equal to <UIAlertController: 0x78e9b6b0>'s view's window!

在我点击确定按钮后，视图没有改变

这是按钮的代码：

   @IBAction func saveScorePressed(sender: AnyObject) {
    let namePrompt = UIAlertController(title: "Enter Name", message: "You have selected to enter your name", preferredStyle: UIAlertControllerStyle.Alert)
        namePrompt.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))

    namePrompt.addTextFieldWithConfigurationHandler({(textField: UITextField!) in
        textField.placeholder = "Name"
                })

    presentViewController(namePrompt, animated: true, completion: nil)
    name = //how do i copy from uialtertview textfield?
    self.performSegueWithIdentifier("writelb", sender: nil)

}

这是转场：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if (segue.identifier=="writelb")
    {
        let destinationVC:ViewController4 = segue.destinationViewController as ViewController4
        destinationVC.score = score
        destinationVC.errors = errors
        destinationVC.combo = combo
        destinationVC.comboH = comboH


    }

我认为segue代码是正确的，因为我在应用程序的其他部分使用没有任何问题我不知道如何使序列工作以及如何将数据从 Uialertviewtextfield 复制到字符串变量

Answer 1

您无法在调用 presentViewController 之后的行中获取名称，因为该调用不会阻塞。它呈现视图控制器然后继续。您应该将 segue 的代码放入 "OK" 按钮的处理程序中。由于 segue 的发送者可以是任何对象，您可以从警报中获取 textField 并将其设为发送者。然后在 prepareForSegue 中获取文本并将其发送到目标视图控制器。

@IBAction func goPressed(sender: AnyObject) {
    let namePrompt = UIAlertController(title: "Enter Name", message: "You have selected to enter your name", preferredStyle: .Alert)

    namePrompt.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
        if let textFields = namePrompt.textFields as? [UITextField] {
            // Grab the first (only) text field and perform the segue designating
            // the textField as the sender.
            self.performSegueWithIdentifier("writelb", sender: textFields[0])
        }
    }))

    namePrompt.addTextFieldWithConfigurationHandler({(textField: UITextField!) in
        textField.placeholder = "Name"
    })

    presentViewController(namePrompt, animated: true, completion: nil)
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "writelb" {
        let dvc = segue.destinationViewController as ViewController4
        // Get name from textField and pass it to the destination view controller.
        dvc.name = (sender as UITextField).text
    }
}

Uialtertview -> Insert String -> Segue 怎么样？

Uialtertview -> Insert String -> Segue How?

ios

swift

segue

uialertview