我想在按下检索按钮时在文本字段上显示保存的用户名和密码

如何解决我想在按下检索按钮时在文本字段上显示保存的用户名和密码

我制作了一个保存按钮，将用户名文本添加到用户默认值并将密码文本添加到 KeyChainSwift。我还做了一个按钮检索，它获取数据并将其添加到文本字段。但它不起作用。我打印了，它给了我所需的输出。我是否必须在 viewdidload 函数中进行更改才能在文本字段上显示回来？

import UIKit
import KeychainSwift

class ViewController: UIViewController {

@IBOutlet var lblUsername: UITextField!
@IBOutlet var lblPassword: UITextField!

let keychain = KeychainSwift()
let defaults = UserDefaults.standard

override func viewDidLoad() {
    super.viewDidLoad()
}

@IBAction func didTap() {
    
    let username = lblUsername.text!
    let password = lblPassword.text!

    defaults.setValue(username,forKey: "user")

    keychain.set(password,forKey: "pass")
    
    lblUsername.text! = ""
    lblPassword.text! = ""
    
}

@IBAction func didRetrieveData(){
    let userString = UserDefaults.standard.string(forKey: "user")!
    self.lblUsername.text! = userString
    
    let userPassword = keychain.get("pass")!
    self.lblPassword.text! = userPassword
}

}

解决方法

代码似乎工作正常，我可以通过任何方式检索数据，我将在下面发布对我有用的代码。

import UIKit
import KeychainSwift

class ViewController: UIViewController {

    @IBOutlet var lblUsername: UITextField!
    @IBOutlet var lblPassword: UITextField!

    let keychain = KeychainSwift()
    let defaults = UserDefaults.standard
    var isSaved = false

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func didTap(sender: UIButton) {
        
        let username = lblUsername.text!
        let password = lblPassword.text!
        
        if(username != "" && password != "") {
            defaults.setValue(username,forKey: "user")
            keychain.set(password,forKey: "pass")
            lblUsername.text! = ""
            lblPassword.text! = ""
            isSaved = true
        } else {
            self.okAlert(title: "Error",message: "Please fill all fields")
        }
        
    }

    @IBAction func didRetrieveData(sender: UIButton){
        if(isSaved == true) {
            let userString = UserDefaults.standard.string(forKey: "user")!
            self.lblUsername.text! = userString
            
            let userPassword = keychain.get("pass")!
            self.lblPassword.text! = userPassword
        } else {
            self.okAlert(title: "Error",message: "No data to be retieved")
        }
    }
    

}
extension UIViewController {
    func okAlert(title: String,message: String) {
        let alert = UIAlertController(title: title,message: message,preferredStyle: UIAlertController.Style.alert)
        alert.addAction(UIAlertAction(title: "Ok",style: UIAlertAction.Style.default,handler: nil))
        self.present(alert,animated: true,completion: nil)
    }
}