按回車鍵操作在警報中輸入

Question

如何捕獲回車鍵並對警報內的文本字段執行操作？ 下面是警報代碼：您需要設置文本字段的委託，並在你的類實現UITextFieldDelegate

var alert = UIAlertController(title: "Add Country", message: "Add a country to the Speaker's List", preferredStyle: .Alert) 

    let saveAction = UIAlertAction(title: "Save", style: .Default) { 
     (action: UIAlertAction!) -> Void in 
     let textField = alert.textFields![0] as! UITextField 
     self.countries.append(textField.text) 
     self.speakersListTableView.reloadData() 
    } 

    let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { 
     (action: UIAlertAction!) -> Void in 
    } 

    alert.addTextFieldWithConfigurationHandler { 
     (textField: UITextField!) -> Void in 
    } 

    alert.addAction(saveAction) 
    alert.addAction(cancelAction) 

Answer 1

。像這樣：

import UIKit 

class ViewController: UIViewController, UITextFieldDelegate 
{ 
    override func viewDidLoad() 
    { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() 
    { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    override func viewDidAppear(animated: Bool) 
    { 
     var alert = UIAlertController(title: "Add Country", message: "Add a country to the Speaker's List", preferredStyle: .Alert) 

     let saveAction = UIAlertAction(title: "Save", style: .Default) { 
      (action: UIAlertAction!) -> Void in 
      let textField = alert.textFields![0] as! UITextField 
      //self.countries.append(textField.text) 
      //self.speakersListTableView.reloadData() 
     } 

     let cancelAction = UIAlertAction(title: "Cancel", style: .Default) { 
      (action: UIAlertAction!) -> Void in 
     } 

     alert.addTextFieldWithConfigurationHandler { 
      (textField: UITextField!) -> Void in 
      textField.delegate = self 
     } 

     alert.addAction(saveAction) 
     alert.addAction(cancelAction) 

     self.presentViewController(alert, animated: true) {() -> Void in 
     } 
    } 


    func textFieldDidBeginEditing(textField: UITextField) 
    { 
     println("textFieldDidBeginEditing") 
    } 

    func textFieldDidEndEditing(textField: UITextField) { 
     println("textFieldDidEndEditing") 
    } 

}