Syringe
A ligh-weight DI framework based on Swift Property Wrappers
? Installation
Add DI directory from this repository to your project somewhere and that’s it!
? What is included
Basically, we have SharedDependencyContainer that holds objects as singletons for specific keys or types.
If you want to create a custom container, you can implement DependencyContainer protocol into your class,
and configure your container with dependencies.
For getting dependencies from containers there is a Injected property wrapper.
Also it allows getting dependencies from custom containers.
? How to use
First, you need to register dependencies in container. Usually, it is performed in AppDelegate,
but not required to do it so.
// Definition
let someRepository = SomeRepository()
let currentUserId = "1"
// Registration
SharedDependencyContainer.register(someRepository) // Usual registration
SharedDependencyContainer.register(currentUserId, for: "user_id") // Registration for specific identifier
? It’s allowed to register more than one object of the same type, but you have to specify the unique identifier for each object and get them by it.
Then to get the dependency in your abstraction, simply define the variable with @Injected property wrapper:
class SomeViewModel {
@Injected()
private var someRepository: SomeRepository
@Injected(identifier: "user_id")
private var userId: String
// Use it as usual
func printUserId() {
print(userId)
}
}
If you need to get the dependency from the specific container, you can define it explicitly:
@Injected(container: CustomContainer.self)
private var anotherRepository: AnotherRepository
