视图控制器中的依赖项注入

我正在尝试使用依赖注入,而不是遵循单例。这就是我努力实现的目标。当我运行应用程序时,我遇到了一个错误 "No "decodeObject" candidates produce the expected contextual result type "ModelManager" 在那上面。知道如何以正确的方式实现依赖注入吗?

我的模型类:

class ModelManager {
var results: MyCustomClass

init(results: MyCustomClass) {
    self.results = results
}
func update(customDataInfo: MyCustomClass!) {
    self.results = customDataInfo
}
}

MyViewController。敏捷的

class MyViewController: UIViewController {

private let modelManager: ModelManager

init(modelManager: ModelManager) {
    self.modelManager = modelManager
    super.init(nibName: nil, bundle: nil)
    self.modelManager.modelManagerUpdate = self as ModelManagerUpdate
}

 required init?(coder aDecoder: NSCoder) {
    self. modelManager = aDecoder.decodeObject(value(forKey: "modelManager") as ModelManager)
    super.init(coder: aDecoder)

    fatalError("init(coder:) has not been implemented")
}

override func encode(with aCoder: NSCoder) {
    super.encode(with: aCoder)
    aCoder.encode(self. modelManager, forKey: "modelManager")
}
}