标签-> 警报控制器文本字段？我可以在警报控制器的文本字段中从标签中编辑预先存在的文本吗？斯威夫特 3，Xcode 8，IOS

Question

基本上，i have an alert controller set up so that when i click a button in the view controller, an alert controller pops up and i can type words into a textfield, click an "OK" button 会将文本插入到视图控制器的标签中。我已经扩展了这个能力，所以我可以拥有preset keywords (like "Good," "Likely" and "Almost") that i can select from in the alert controller to speed up the typing process, as these words are typed a lot in my app. 我想知道你是否也可以编辑我选择的那些关键词？每次我尝试将文本添加到标签中的任何文本时，我都必须从空白文本字段开始。

具体来说，无论我的标签中已有什么文本，我可以在我的文本字段中准备好该文本以进行编辑，下次我拉起警报控制器吗？

这是我到目前为止的第二张图片：

//Editable Text Box with Preset Keywords

@IBOutlet weak var UselessLabel: UILabel!

@IBAction func UselessTapped(_ sender: UIButton) {
    print("Useless Button Tapped")
    openUselessAlert()

}

func openUselessAlert() {

    //Create Alert Controller
    let alert9 = UIAlertController (title: "Uselss:", message: nil, preferredStyle: UIAlertControllerStyle.alert)

    //preset keyword as button in alert controller
    let bt1 = UIAlertAction(title: "Good", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Good"}

    alert9.addAction(bt1)

    //preset keyword as button in alert controller
    let bt2 = UIAlertAction(title: "Likely", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Likely"}

    alert9.addAction(bt2)

    //preset keyword as button in alert controller
    let bt3 = UIAlertAction(title: "Almost", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Almost"}

    alert9.addAction(bt3)

    //Create Cancel Action
    let cancel9 = UIAlertAction(title: "CANCEL", style: UIAlertActionStyle.cancel, handler: nil)

    alert9.addAction(cancel9)


    //Create OK Action
    let ok9 = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (action: UIAlertAction) in print("OK")
        let textfield = alert9.textFields?[0]
        print(textfield?.text!)
        self.UselessLabel.text = textfield?.text!
    }

    alert9.addAction(ok9)

    //Add Text Field
    alert9.addTextField { (textfield: UITextField) in
        textfield.placeholder = "Useless"
    }

    //Present Alert Controller
    self.present(alert9, animated:true, completion: nil)
}

请帮忙！总的来说，我对 Xcode 和编程真的很陌生，所以在这方面我是个大白痴。

谢谢:)

Answer 1

只需将占位符替换为文本

//Editable Text Box with Preset Keywords

@IBOutlet weak var UselessLabel: UILabel!

@IBAction func UselessTapped(_ sender: UIButton) {
    print("Useless Button Tapped")
    openUselessAlert()

}

func openUselessAlert() {

    //Create Alert Controller
    let alert9 = UIAlertController (title: "Uselss:", message: nil, preferredStyle: UIAlertControllerStyle.alert)

    //preset keyword as button in alert controller
    let bt1 = UIAlertAction(title: "Good", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Good"}

    alert9.addAction(bt1)

    //preset keyword as button in alert controller
    let bt2 = UIAlertAction(title: "Likely", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Likely"}

    alert9.addAction(bt2)

    //preset keyword as button in alert controller
    let bt3 = UIAlertAction(title: "Almost", style: UIAlertActionStyle.default){
        (action) in self.UselessLabel.text = "Almost"}

    alert9.addAction(bt3)

    //Create Cancel Action
    let cancel9 = UIAlertAction(title: "CANCEL", style: UIAlertActionStyle.cancel, handler: nil)

    alert9.addAction(cancel9)


    //Create OK Action
    let ok9 = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) { (action: UIAlertAction) in print("OK")
        let textfield = alert9.textFields?[0]
        print(textfield?.text!)
        self.UselessLabel.text = textfield?.text!
    }

    alert9.addAction(ok9)

    //Add Text Field
    alert9.addTextField { (textfield: UITextField) in
        textfield.text = "Useless"
    }

    //Present Alert Controller
    self.present(alert9, animated:true, completion: nil)
}