Swift：插入帶有文本輸入的提示框（和存儲文本輸入）

Question

在我的一個viewController中，我想讓一個alert box出現，提示user鍵入此信息。然後，我希望用戶存儲此輸入使用NSUserDefaults。我怎樣才能做到這一點？

預先感謝您！

Answer 1

檢查了這一點：

let alertController = UIAlertController(title: "Email?", message: "Please input your email:", preferredStyle: .Alert) 

let confirmAction = UIAlertAction(title: "Confirm", style: .Default) { (_) in 
    if let field = alertController.textFields![0] as? UITextField { 
     // store your data 
     NSUserDefaults.standardUserDefaults().setObject(field.text, forKey: "userEmail") 
     NSUserDefaults.standardUserDefaults().synchronize() 
    } else { 
     // user did not fill field 
    } 
} 

let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (_) in } 

alertController.addTextFieldWithConfigurationHandler { (textField) in 
    textField.placeholder = "Email" 
} 

alertController.addAction(confirmAction) 
alertController.addAction(cancelAction) 

self.presentViewController(alertController, animated: true, completion: nil) 

Answer 2

SWIFT 3

func presentAlert() { 
    let alertController = UIAlertController(title: "Email?", message: "Please input your email:", preferredStyle: .alert) 

    let confirmAction = UIAlertAction(title: "Confirm", style: .default) { (_) in 
     if let field = alertController.textFields?[0] { 
      // store your data 
      UserDefaults.standard.set(field.text, forKey: "userEmail") 
      UserDefaults.standard.synchronize() 
     } else { 
      // user did not fill field 
     } 
    } 

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (_) in } 

    alertController.addTextField { (textField) in 
     textField.placeholder = "Email" 
    } 

    alertController.addAction(confirmAction) 
    alertController.addAction(cancelAction) 

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

Answer 3

在SWIFT 3

let alertController = UIAlertController(title: "SecureStyle", message: "SecureStyle AlertView.", preferredStyle: UIAlertControllerStyle.Alert) 
alertController.addTextFieldWithConfigurationHandler { (textField : UITextField) -> Void in 
      textField.secureTextEntry = true 
      textField.placeholder = "Password" 
     } 
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) { (result : UIAlertAction) -> Void in 
      print("Cancel") 
     } 
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) { (result : UIAlertAction) -> Void in 
      print(alertController.textFields?.first?.text) 
     } 
alertController.addAction(cancelAction) 
alertController.addAction(okAction) 
self.presentViewController(alertController, animated: true, completion: nil)