显示用户名在应用程序超时空白

Question

即使我正在设置值NSUSERdefault.Its与锁定模式下工作，但相同的代码不工作超时的应用程序（5分钟）用户是vcLogin.usernameTxt ?. text = uname即使是NSUserDefaults.standardUserDefaults（）。objectForKey（“用户名”）！字符串具有价值

  let storyboard = UIStoryboard(name: "Main", bundle: nil) 
      let vcLogin = storyboard.instantiateViewControllerWithIdentifier("Login") as! LoginViewController 
      var uname:String! 
      if (NSUserDefaults.standardUserDefaults().objectForKey("Username") != nil) { 
       print("username =\(NSUserDefaults.standardUserDefaults().objectForKey("Username"))") 
       uname = NSUserDefaults.standardUserDefaults().objectForKey("Username") as! String 
       NSUserDefaults.standardUserDefaults().synchronize() 

      }else{ 
       uname = "" 
      } 



      let navVC = self.window?.rootViewController as? UINavigationController 

      var arr=[UIViewController]() 
      arr = (navVC?.viewControllers)! 


      if ((arr.last?.isKindOfClass(LoginViewController)) != nil) { 

       arr.append(vcLogin) 
       navVC?.viewControllers = arr 
       print("name=\(uname)") 
       //if uname != nil { 
       vcLogin.usernameTxt?.text = uname 
       //} 
      } 






     } 

    } 

Answer 1

let theUsername = NSUserDefaults.standardUserDefaults().objectForKey("Username")! 
print("username =\(theUsername)") 

顺便说一句，你为什么用斯威夫特2？