我正在使用realm-cocoa对于我的持久层。有一个类取决于realmclassRealmMetaData:AbstractMetaData{varrealm:RealmInterfacevarisFirstLaunch:Bool=falseinit(realm:RealmInterface=try!Realm()){self.realm=realmletresults=realm.objects(MyClass.self)self.isFirstLaunch=(results.count==0)if(self.isFirstLaunch){realm.write{realm.add