What am I Doing wrong in Swinject? - ios

Question

Whenever I run this code the init() of the VCModel gets called but Swinject is not Injecting the VCModel instance to my ViewController. Can Someone Please tell me what am I doing wrong?
Error I get is:
Unexpectedly Found nil while unwrapping an optional value in
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
}
ViewController
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)
}

Answer 1

Can you try out the following code in AppDelegate.swift
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
}

Answer 2

Code in your AppDelegate →　application:didFinishLaunchingWithOptions method does seems to work properly. I have verified it with following code:
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()
}
}
I can not tell what your VCModel's init method looks like but looking at
...
// Do any additional setup after loading the view.
viewModel.cellModels
...
From the error you are getting:
Unexpectedly Found nil while unwrapping an optional value in ViewController viewModel.cellModels
It looks like cellModels which I assume is implicitly unwrapped property, you must initialize it VCModel's init method.