Question

我正在尝试执行此序列

点按按钮
显示带文本字段的UiAltertView
按OK
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，我不明白为什么当uialertview出现时，这就是我从输出中得到的结果：

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!

点按“确定”按钮后，视图无法更改

以下是按钮的代码：

   @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segue：

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String变量

Answer 1

在调用presentViewController后，您无法在行中获取该名称，因为该调用不会阻止。它呈现视图控制器然后继续。您应该将segue的代码放入“确定”按钮的处理程序中。由于segue的发件人可以是任何对象，因此您可以从警报中获取textField并将其作为发件人。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 - ＆gt;插入字符串 - ＆gt;冥想怎么样？

1 个答案: