ios - UIAlertController 文本字段没有得到输入

Question

我正在尝试编码，UIAlertController它通过UITextfield.

当我运行打印语句时，在我在文本字段中输入内容并点击保存按钮后，什么都不会打印。

@IBAction func reqTimeButton(_ sender: Any) {

  // time is requested by student

    timer.invalidate()

    let alert = UIAlertController(title: "Time Request", message: "Please enter your reason to extend the time of your trip", preferredStyle: .alert)

    alert.addTextField { (reason) in

        reason.placeholder = "" }

    alert.addAction(UIAlertAction(title: "Continue", style: .default, handler: { (action) in

        let textField = alert.textFields![0]
        textField.text = self.request
        self.totalTime = self.totalTime + 480
        self.initialTime = self.initialTime + 480
        self.runTimer()
        print(textField.text!)   }))

    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in

        self.runTimer()  }))

    self.present(alert, animated: true, completion: nil)        
}

标签： iosswift

Answer 1

i figured out what was wrong. This is the working code.

@IBAction func reqTimeButton(_ sender: Any) {

  // time is requested by student

    timer.invalidate()

    let alert = UIAlertController(title: "Time Request", message: "Please enter your reason to extend the time of your trip", preferredStyle: .alert)

    alert.addTextField { (reason) in

        reason.placeholder = "" }

    alert.addAction(UIAlertAction(title: "Continue", style: .default, handler: { (action) in

        let textField = alert.textFields![0]
        print(textField.text!)
        self.totalTime = self.totalTime + 480
        self.initialTime = self.initialTime + 480
        self.runTimer()
        self.request = textField.text!
        print(self.request)  }))

    alert.addAction(UIAlertAction(title: "Cancel", style: .default, handler: { (action) in

        self.runTimer()  }))

    self.present(alert, animated: true, completion: nil)        
}