Question

我试图在Swift上的AppDelegate上使用静态变量，所以我可以为所有viewControllers设置/获取值

AppDelegate.swift

class AppDelegate: UIResponder, UIApplicationDelegate {
 struct Static {
        static var userId: String?
    }

获得：

var userGuid: String = AppDelegate.Static.userId!

环境：

AppDelegate.Static.userId = "123456"

但不知怎的，我的静态var总是传递nil

可能会发生什么？ THX

Answer 1

为您的用户会话信息设置一个专用类会更清楚吗？

示例（假设正在使用Swift 2.0）

class SessionInfo  {
    var userId:String?
    static let sharedInstance = SessionInfo()
}

然后

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.

    SessionInfo.sharedInstance.userId = "foobar"
    return true
}

另一种观点

 @IBOutlet weak var labelTop: UILabel!
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        labelTop.text = SessionInfo.sharedInstance.userId
    }

Swift上的静态变量

1 个答案: