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我有一个与视图一起加载的 textView。然后用户可以编辑和修改值，当用户按下导航按钮时，viewWillDisappear() 将启动并将 textView 出口的值传递给交互器，这应该从 dataManager 触发一个方法来保存它核心数据的价值。

我的问题是在不违反 viper 规则的情况下传递此参数的最佳方法是什么？

我是这样做的，但我几乎可以肯定我做错了。这是我对 VIPER 架构的第一次体验，我们将不胜感激。

查看文件：

import Foundation
import UIKit
class NoteDetailView : UIViewController  {

    var presenter: NoteDetailPresenterProtocol?
    @IBOutlet weak var detailNoteText: UITextView!

    override func viewDidLoad() {
        super.viewDidLoad()
        presenter?.viewDidLoad()
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        presenter?.updatedText = detailNoteText.text
        presenter?.viewWillDisappear()
    }



}
extension NoteDetailView : NoteDetailViewProtocol {
    func showNote(noteDetail note: NoteModel) {
        detailNoteText.text = note.noteText
    }
}

主持人：

import Foundation
class NoteDetailPresenter : NoteDetailPresenterProtocol {
    var view: NoteDetailViewProtocol?
    var updatedText: String?
    var note: NoteModel?

    var router: NoteDetailRouterProtocol?

    var interactor: NoteDetailInteractorProtocol?

    func viewDidLoad(){
        view?.showNote(noteDetail: note!)
    }

    func viewWillDisappear() {
        guard note?.noteText.isEmpty == false, let text = updatedText else {return}
        interactor?.retrieveNote(note: note!, updatedText : text)
    }
}

交互者：

import Foundation
class NoteDetailInteractor : NoteDetailInteractorProtocol {
    var dataManager: NewNoteDataManagerProtocol?
    var localDataManager: NoteListLocalDataManagerInputProtocol?

    func retrieveNote(note: NoteModel, updatedText : String) {
        do {
            if let noteList = try localDataManager?.retrieveNoteList() {

                let noteModelList = noteList.map(){
                    return NoteModel(noteText : $0.noteText != nil ? $0.noteText! : "", creationDate : $0.creationDate != nil ? $0.creationDate! : "")
                }
                if !noteModelList.isEmpty {
                    var noteTextExist = false
                    var indexPath = 0
                    for (index,newnote) in noteModelList.enumerated(){
                        if newnote == note {
                            noteTextExist = true
                            indexPath = index
                        }
                    }
                    if noteTextExist == true {
                        do {
                            noteList[indexPath].noteText = updatedText
                            try dataManager?.updateNote(note: noteList[indexPath])
                        }
                        catch {
                            print(error)
                        }
                    }
                }
            }

        }
        catch {
            print(error)
        }
    }

}

数据管理器：

import Foundation
import CoreData
import UIKit
class NewNoteDataManager : NewNoteDataManagerProtocol{

    func deleteNote(note: Note) throws {
        guard let managedOC = CoreDataStore.managedObjectContext else {
            throw PersistenceError.managedObjectContextNotFound
        }
        managedOC.delete(note)
        do {
            try managedOC.save()
        }
        catch let error as NSError {
            print(error)
        }
    }

    func updateNote(note: Note) throws {
        guard let managedOC = CoreDataStore.managedObjectContext else {
            throw PersistenceError.managedObjectContextNotFound
        }
        do {
            try managedOC.save()
        }
        catch let error as NSError {
            print(error)
        }

    }

    func saveNote(noteText: String) throws {
        guard let managedOC = CoreDataStore.managedObjectContext else {
            throw PersistenceError.managedObjectContextNotFound
        }

        if let entity = NSEntityDescription.entity(forEntityName: String("Note"), in: managedOC) {
            do {
                let newNote = Note(entity: entity, insertInto: managedOC)
                newNote.noteText = noteText

                let date = Date()
                let formatter = DateFormatter()
                formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
                newNote.creationDate = formatter.string(from: date)
                try managedOC.save()
            }catch let error as NSError {
                print(error)
            }
        }else {
            throw PersistenceError.couldNotSaveObject
        }
    }


}

完整的项目可以在这里找到： https ://github.com/AlfroMlg/Notes

4

1 回答 1

2

老实说，我认为你的方法还可以。有人可能会争辩说，最好不要将“updatedText”和“note”等数据存储在 Presenter 中，而是使用方法通过 Presenter 传递这些数据。

您应该在演示者弱中引用视图以避免保留循环。并且由于当演示者还活着时交互器和路由器都不会为零，您可以将它们声明为非可选并在 init 中初始化它们。交互器中的 dataManager 引用也是如此。

于 2018-09-13T10:12:15.807 回答