Swift：插入带有文本输入的警报框（和存储文本输入）

Posted 2023-02-23

【中文标题】Swift：插入带有文本输入的警报框（和存储文本输入）

【英文标题】：Swift: Insert Alert Box with Text Input (and Store Text Input )

【发布时间】：2015-04-22 20:41:28

【问题描述】：

在我的viewController 之一中，我想显示一个alert box，提示user 输入此信息。然后，我希望用户使用NSUserDefaults 存储此输入。我怎样才能做到这一点？

提前感谢您！

【问题讨论】：

@MarkBailey 为什么不直接给他一个答案呢？为什么你必须这样？ 3 下面的人提供了答案，而你试图表现得聪明a$$

【参考方案1】：

看看这个：

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

let confirmAction = UIAlertAction(title: "Confirm", style: .default)  (_) in
  guard let textFields = alertController.textFields,
    textFields.count > 0 else 
      // Could not find textfield
      return
  

  let field = textFields[0]
  // store your data
  UserDefaults.standard.set(field.text, forKey: "userEmail")
  UserDefaults.standard.synchronize()


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)

【参考方案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 emailTextField = alertController.textFields?[0] 
            // do your stuff with emailTextField
         
    

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

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

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

    present(alertController, animated: true, completion: nil)

【参考方案3】：

在 Swift 3 中

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)