Inject dependancies of common parent ViewController

[busu90]

All of my ViewControllers have a common parent, lets say P. Is there a way to inject the parameters for this common parent whitout having to do this in each individual chiald view controller ?

[jakubvano]

Assuming that common dependencies are injected as properties, you might be able to do it by implementing a custom container behavior, something along the lines of

final class ParentViewControllerBehavior: Behavior {
    func container<Type, Service>(
        _ container: Container,
        didRegisterType type: Type.Type,
        toService entry: ServiceEntry<Service>,
        withName name: String?
    ) {
        guard type is ParentViewController.Type else { return }
        entry.initCompleted { resolver, vc in
            (vc as! ParentViewController).commonDependency = resolver.resolve(Any.self)
        }
    }
}

container.addBehavior(ParentControllerBehavior())
container.register(ChildViewController.self) { /* only need to inject specific dependencies */ }

This basically checks every registration if the type inherits from ParentViewController, and appends initCompleted setup to it.

[Capotasto]

@jakubvano Sorry for this late question. I tried above code for injecting some dependencies into my BaseViewController that is inherited by ViewControllers.

1. type is always UIViewController.Type and never be BaseViewController.Type so always return function. How to get specific Child ViewController Type?
2. I use storyboardInitCompleted to register my ViewControllers to the Container. Should I register again like your last line?

[Capotasto]

I think I figured out by my self. The code worked perfectly below

       guard type is UIViewController.Type else { return }
        entry.initCompleted { resolver, vc in
            (vc as! ParentViewController).commonDependency = resolver.resolve(Any.self)
        }