「UIApplication.sharedApplication（）。委託」swift_dynamicCastClassUnconditional

Question

試圖訪問我的AppDelegate實例，但失敗了swift_dynamicCastClassUnconditional。

class AppDelegate: UIResponder, UIApplicationDelegate { 
    class func getInstance() -> AppDelegate { 
     let delegate = UIApplication.sharedApplication().delegate; 
     return delegate as AppDelegate; 
    } 
    ........ 
} 

任何想法？謝謝。

Answer 1

原來是由Urbanairship圖書館引起的。當應用程序初始化時，我所謂的API

var uaconfig = UAConfig.defaultConfig() as UAConfig 
    UAirship.setLogLevel(UALogLevel.Debug) 
    UAirship.takeOff(uaconfig) 
    UAPush.shared().userNotificationTypes = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound 
    UAPush.shared().userPushNotificationsEnabled = true 

之後我刪除上面的代碼，現在一切都很好。