我正在尝试创建一个单一的访问方法。我收到这个错误(见下面的代码)。我不明白为什么我收到这个错误，这个错误是什么意思。有人可以解释吗
@H_403_4@@UIApplicationMain
class AppDelegate: UIResponder,UIApplicationDelegate {
static private var thedelegate: AppDelegate?
class var delegate : AppDelegate {
return thedelegate!
}
func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
thedelegate = self // Syntax error: Static member 'thedelegate' cannot be used on instance of type 'AppDelegate'
