[ Swift - MVVM ] 네비게이션 바 아이템

기존에 작성하던 MVC 아키텍쳐에서 MVVM 으로 바꿔보는 과정에서

네비게이션 바 아이템이 원하는 뷰에 추가되지 않는 문제를 발견했다

---

해당 뷰에 바버튼 아이템이 없다.

---

class RxSubjectViewModel: UIViewController {
    
    var contactData = [
        Contact(name: "Father", age: 21, address: "Seoul in Korea"),
        Contact(name: "Mother", age: 23, address: "Seoul in Korea"),
        Contact(name: "Sister", age: 25, address: "Seoul in Korea"),
        Contact(name: "Friend1", age: 21, address: "Seoul in Korea"),
        Contact(name: "Friend2", age: 21, address: "Seoul in Korea")
    ]
    
    var list = PublishSubject<[Contact]>()
    
    func navigationSetting() {
        let resetButton = UIBarButtonItem(title: "리셋", style: .plain, target: self, action: #selector(resetData))
        let addButton = UIBarButtonItem(title: "추가", style: .plain, target: self, action: #selector(fetchData))
        let newContactButton = UIBarButtonItem(title: "새로운 연락처", style: .plain, target: self, action: #selector(newData))
        

        navigationItem.leftBarButtonItem = newContactButton
        navigationItem.rightBarButtonItems = [addButton, resetButton]
    }
}

 

-적용할 뷰-

class RxSubjectViewController: UIViewController {
    
    let mainView = RxSubjectView()
    let viewModel = RxSubjectViewModel()
    
    override func loadView() {
        view = mainView
        view.backgroundColor = .white
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        viewModel.navigationSetting()
    }
    
    
}

 

- 문제 추론

1. target을 해당 뷰 컨트롤러로?

 

func navigationSetting() {
	let resetButton = UIBarButtonItem(title: "리셋", style: .plain, target: self, action: #selector(resetData))
	let addButton = UIBarButtonItem(title: "추가", style: .plain, target: self, action: #selector(fetchData))
	let newContactButton = UIBarButtonItem(title: "새로운 연락처", style: .plain, target: self, action: #selector(newData))
}

######################################################################
-> 해당 코드에서 target: self 이 부분에 주목했음

 

- 수정

 

class RxSubjectViewModel: UIViewController {
    
    func navigationSetting(viewName: UIViewController) {
        let resetButton = UIBarButtonItem(title: "리셋", style: .plain, target: viewName, action: #selector(resetData))
        let addButton = UIBarButtonItem(title: "추가", style: .plain, target: viewName, action: #selector(fetchData))
        let newContactButton = UIBarButtonItem(title: "새로운 연락처", style: .plain, target: viewName, action: #selector(newData))
        
        navigationItem.leftBarButtonItem = newContactButton
        navigationItem.rightBarButtonItems = [addButton, resetButton]
    }
}

 

이 방법 역시 적용되지 않았고

네비게이션 바 아이템이 적용되는 뷰 시점에 대해서 생각해보게됐다.

---

2. 아...이런

target에 주목했던 이유가 뭘까...

결국 해당 네비게이션 아이템이 적용되는 시점을 파악하면 될 문제였는데

 

class RxSubjectViewModel: UIViewController {
    
    func navigationSetting(view: UIViewController) {
        let resetButton = UIBarButtonItem(title: "리셋", style: .plain, target: self, action: #selector(resetData))
        let addButton = UIBarButtonItem(title: "추가", style: .plain, target: self, action: #selector(fetchData))
        let newContactButton = UIBarButtonItem(title: "새로운 연락처", style: .plain, target: self, action: #selector(newData))
        
        view.navigationItem.leftBarButtonItem = newContactButton
        view.navigationItem.rightBarButtonItems = [addButton, resetButton]
    }
}

 

-적용

class RxSubjectViewController: UIViewController {
    
    let mainView = RxSubjectView()
    let viewModel = RxSubjectViewModel()
    
    override func loadView() {
        view = mainView
        view.backgroundColor = .white
        
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        viewModel.navigationSetting(view: self)
    }
    
    
}

 

---

MVVM에 익숙치 않아서 생긴 문제라 생각하고 싶다..