klein-artur / SwiftDose

A lightweigth dependency injection lib

SwiftDose

A very lightweight dependency injection for swift.

To use it:

For every type you want to inject create a provider for either Singletons or new instances every time. The instance injection will create a new instance per new @Dose injection:

private var someSingletonProvider = SingletonProvider(SomeSingleton())
private var someInstanceProvider = InstanceProvider {
    SomeInstance()
}
private var instanceProcotolProvider = InstanceProvider<any Protocol> {
    SomeProtocolImplementation()
}

extension DoseBindings {
    var someSingleton: SingletonProvider<SomeSingleton> {
        get { someSingletonProvider }
        set { someSingletonProvider = newValue }
    }
    var someInstance: InstanceProvider<SomeInstance> {
        get { someInstanceProvider }
        set { someInstanceProvider = newValue }
    }
    var someProtocol: InstanceProvider<any Protocol> {
        get { instanceProcotolProvider }
        set { instanceProcotolProvider = newValue }
    }
}

Then you can use it everywhere like this:

class SomeClass {
    @Dose(of: \.someSingleton) var theSingleton
    @Dose(of: \.someInstance) var theInstance
}

If you want to override the given providers with new values you can to it like this (for example for testing or previews):

DoseBindings[\.someSingleton] = SingletonProvider(theOtherInstance)