Register成功，但调用了两次DeviceToken的RegisterForRemomentNotifications

每次启动我的应用程序，都会调用两次使用DeviceToken的

DidRegisterForRemotionTifications，推送可以正常发送和接收

code:
// launch method
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if (iOS8_OR_LATER)
{
   // register remote notification
   [[UIApplication sharedApplication] registerForRemoteNotifications];
   [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge|UIUserNotificationTypeSound|UIUserNotificationTypeAlert categories:nil]];
}
else
{
   // register remote notification
   [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeSound|UIRemoteNotificationTypeAlert];
}
}