我在 Swinject 中做错了啥？

Posted 2023-03-22

【中文标题】我在 Swinject 中做错了啥？

【英文标题】：What am I Doing wrong in Swinject?我在 Swinject 中做错了什么？

【发布时间】：2019-12-23 12:12:55

【问题描述】：

每当我运行此代码时，都会调用 VCModel 的 init()，但 Swinject 不会将 VCModel 实例注入到我的 ViewController。有人可以告诉我我做错了什么吗？ 我得到的错误是：

在展开可选值时意外发现 nil ViewController viewModel.cellModels

AppDelegate

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 
    // Override point for customization after application launch.

    container = Container()  con in
        con.register(VCModeling.self)  _ in
            VCModel()
        

        con.storyboardInitCompleted(ViewController.self)  r, c in
            c.viewModel = r.resolve(VCModeling.self)!
        
    

    let window = UIWindow(frame: UIScreen.main.bounds)
    window.backgroundColor = UIColor.white
    window.makeKeyAndVisible()
    self.window = window
    let bundle = Bundle(for: ViewController.self)
    let storyboard = SwinjectStoryboard.create(name: "Main", bundle: bundle, container: container)
    window.rootViewController = storyboard.instantiateInitialViewController()

    return true

视图控制器

private let disposeBag = DisposeBag()
var viewModel: VCModeling!

override func viewDidLoad() 
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    viewModel.cellModels
     .bind(to: tableView.rx.items(cellIdentifier: "myCell", cellType: MyCellClass.self)) 
         i, cellModel, cell in
       cell.viewModel = cellModel
     .disposed(by: disposeBag)

【参考方案1】：

你能在 AppDelegate.swift 中试试下面的代码吗

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 
        // Override point for customization after application launch.

        container = Container()  con in
            con.register(VCModeling.self)  _ in
                VCModel()
            

            con.storyboardInitCompleted(ViewController.self)  r, c in
                c.viewModel = r.resolve(VCModeling.self)!

                let window = UIWindow(frame: UIScreen.main.bounds)
                window.backgroundColor = UIColor.white
                window.makeKeyAndVisible()
                self.window = window
                window.rootViewController = c
            
        
        return true
    

【讨论】：

你从哪里得到模型？在 AppDelegate 中

这不是 Swinject 必须要做的吗？

【参考方案2】：

AppDelegate 中的代码 →　application:didFinishLaunchingWithOptions 方法似乎可以正常工作。我已经用以下代码验证了它：

class ViewController: UIViewController 

    var viewModel: VCModeling!

    override func viewDidLoad() 
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        print(viewModel.uuid)
    


protocol VCModeling 
    var uuid: UUID  get 


class VCModel: VCModeling 
    let uuid: UUID
    init() 
        self.uuid = UUID()
    

我不知道你的VCModel 的init 方法是什么样的，但是看着

    ...
// Do any additional setup after loading the view.
    viewModel.cellModels
    ...

从您得到的错误中： Unexpectedly Found nil while unwrapping an optional value in ViewController viewModel.cellModels

它看起来像cellModels，我认为它是隐式解包属性，你必须初始化它VCModel 的init 方法。