1. 利用NSUserDefaults存储用户名和密码

（1）获取用户名和密码

 userTextFeild.text = NSUserDefaults.standardUserDefaults().valueForKey("userName") as! String!
        passWordTextFeild.text = NSUserDefaults.standardUserDefaults().valueForKey("password") as! String!

// MARK: 点击事件
    func loginButtonClick(sender: UIButton!)
    {
        print("UiSlider Vaule: \(sender.tag)")
        
        if userTextFeild.text == "ww" && passWordTextFeild.text == "123456"
        {
            NSUserDefaults.standardUserDefaults().setObject(userTextFeild.text,forKey: "userName")
            NSUserDefaults.standardUserDefaults().setObject(passWordTextFeild.text,forKey: "passWord")
            NSUserDefaults.standardUserDefaults().synchronize()
            
            let rootVC = TFTabBarViewController()
            self.navigationController!.pushViewController(rootVC,animated: false)
        }
        
        else
        {
           let alertView = UIAlertView()
           alertView.title = "提示"
           alertView.message = "账户或密码输入错误"
           //alertView.addButtonWithTitle("我知道了")
           alertView.addButtonWithTitle("确定")
           alertView.cancelButtonIndex=0
           alertView.delegate=self;
           alertView.show()
        }
    }

 let loginButton = UIButton(frame: CGRectMake(10,240,300,40))
        loginButton.setTitle("登录",forState:UIControlState.Normal)
        loginButton.backgroundColor = UIColor.redColor()
        loginButton.tag = 999
        loginButton.addTarget(self,action: "loginButtonClick:",forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(loginButton)

 let backButton = UIButton(frame: CGRectMake(0,12,70,44))
        backButton.addTarget(self,action: "backBtn:",forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(backButton)
        
       let arrowView=UIImageView(image:UIImage(named:"icon-driver-zhaohuo-back.png"))
       arrowView.frame=CGRectMake(0,50,35)
       backButton.addSubview(arrowView)

 titleLable = UILabel(frame: CGRectMake(0,25,self.view.frame.size.width,30))
        titleLable.text = title as String
        titleLable.textAlignment = NSTextAlignment.Center
        titleLable.font=UIFont(name:"Thonburi",size:18)
        titleLable.backgroundColor = UIColor.clearColor()
        self.navigationView.addSubview(titleLable);