Question

我有一个登录屏幕，提示用户登录。第一次成功登录后，我需要应用程序在用户再次打开应用程序时取消登录屏幕。我正在使用NSUserDefaults将成功登录设置为true。但是，始终向用户显示登录屏幕。请帮忙。感谢。

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.



    if (NSUserDefaults.standardUserDefaults().objectForKey("onoroff") != nil)  {
    self.performSegueWithIdentifier("segue", sender: nil)


    }



}

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


@IBAction func button(sender: AnyObject) {

    if ((loginid.text == "Hussain") && (passwordText.text == "1234" ))
    {
            NSUserDefaults.standardUserDefaults().setBool(true, forKey: "onoroff")

            self.performSegueWithIdentifier("segue", sender: nil)        }
    else
    {
    failedtext.hidden = false       }


}

Answer 1

将objectForKey更改为boolForKey

if (NSUserDefaults.standardUserDefaults().boolForKey("onoroff"))  {
    self.performSegueWithIdentifier("segue", sender: nil)


    }

也这样做

@IBAction func button(sender: AnyObject) {

    if ((loginid.text == "Hussain") && (passwordText.text == "1234" ))
    {
           NSUserDefaults.standardUserDefaults().setBool(true, forKey: "onoroff")
           NSUserDefaults.standardUserDefaults().synchronize()


            self.performSegueWithIdentifier("segue", sender: nil)  
     }
    else
    {
           failedtext.hidden = false       
     }


}

Answer 2

尝试添加

if (NSUserDefaults.standardUserDefaults().boolForKey("onoroff")))  {
    self.performSegueWithIdentifier("segue", sender: nil)
}

在viewDidAppear方法而不是viewDidLoad

始终显示登录屏幕

2 个答案: