Swift-子类化的视图控制器不继承超类属性

如何解决Swift-子类化的视图控制器不继承超类属性

我有一个基本视图控制器BaseViewController，所有其他视图控制器都从该基础视图控制器中继承而来。看起来像这样：

class BaseViewController : UIViewController,NSFetchedResultsControllerDelegate {
    
//    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    
    var appDelegate : AppDelegate {
        return (UIApplication.shared.delegate as? AppDelegate)!
    }
    

    var currentOwner : Issuer = Issuer()
    var currentColor : UIColor = UIColor()
    var now = Calendar.current.component(.year,from: Date())


    
    
    @objc func changeIssuer(issuerName : String) -> Issuer {
        
        let context = appDelegate.persistentContainer.viewContext

        
        let issuerSort = NSSortDescriptor(key: "name",ascending: false)
        let issuerFetchRequest = NSFetchRequest<Issuer>(entityName: "Issuer")
        issuerFetchRequest.sortDescriptors = [issuerSort]
        
        let mainIssuerFRC = NSFetchedResultsController(fetchRequest: issuerFetchRequest,managedObjectContext: context,sectionNameKeyPath: nil,cacheName: nil)
        
        do {
            try mainIssuerFRC.performFetch()
        } catch {
            fatalError("Failed to initialize FetchedResultsController: \(error)")
        }
        
        if ((mainIssuerFRC.fetchedObjects!.count)) > 0 {
            
            if let fObjects = mainIssuerFRC.fetchedObjects{
                for issuerEntity in fObjects{
                    if issuerEntity.name == issuerName{
                        issuerEntity.isCurrent = true
                        currentOwner = issuerEntity
                        print("Current Color is \(currentColor)")
                    }
                }
            }
            currentColor = UIColor.retrieveFromData(data: (currentOwner.colorD!))!
            
            print("In changeIssuer,BaseVC,currentOwner == \(String(describing: currentOwner.name))")
            print("In changeIssuer,currentColor == \(currentColor)")
            
            appDelegate.saveContext()
        }
        return currentOwner
    }
}

extension UIColor {


    class func retrieveFromData(data:Data) -> UIColor? {
        return try? NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data) as? UIColor
    }

    func encodeToData() -> Data? {
        return try? NSKeyedArchiver.archivedData(withRootObject: self,requiringSecureCoding: false)
    }
}

我在各种子类中使用属​​性currentOwner和currentColor。函数changeIssuer还应该更改currentColor，因为它是实体Issuer的属性。

问题是某些子类似乎无法识别currentColor，而我一直需要一个颜色主题来代替[Issuer name]: unrecognized selector sent to instance 0x280946c40

有人有什么想法吗？我可以提供更多必要的代码。

非常感谢所有帮助！

编辑1 说明

在某些VC上，我需要这样指定currentColor：

    currentColor = UIColor.retrieveFromData(data: (currentOwner.colorD!))!

即使currentOwner是通过继承识别的，这也使我相信currentColor也应该被识别。毕竟，它们是用相同的方法定义的。

在其他情况下，我需要同时指定currentOwner和currentColor。我首先通过调用VC在currentOwner中指定了prepareForSegue，

popoverVC.currentOwner = currentOwner

然后，我必须在目标VC的currentColor中指定这样的viewDidLoad：

    currentColor = UIColor.retrieveFromData(data: (currentOwner.colorD!))!

但是，我不明白为什么我需要这样做。由于项目中的所有视图控制器都是从相同的BaseViewController继承而来的，所以它们不应该都继承相同的currentOwner吗？

我在changeIssuer的{​​{1}}中做错什么了吗？