Swinject: Cannot call value of non-function type 'AssemblyType.Type'

[laurenswuyts]

I'm trying to assemble an class to my container form a string but can't get it to work:
Cannot call value of non-function type 'AssemblyType.Type'
It gives the error here: applicationConfigurationAssembly()

let applicationConfigurationAssembly = NSClassFromString(ns + "." + applicationConfigurationAssemblyString) as? AssemblyType.Type{
applicationConfigurationAssembly().assemble(container: SwinjectStoryboard.defaultContainer)

If I remove the () it gives me this error:
Instance member 'assemble' cannot be used on type AssembleType

How is this possible?

[jakubvano]

hi @laurenswuyts

applicationConfigurationAssembly() is interpreted as calling a function. If you want to call an initialiser you would write it as

applicationConfigurationAssembly?.init() //...

However AssemblyType is a protocol and it does not require initialiser, so code above would also fail. Moreover, creating class from string is not very swift-y. If you need to select your assembly based on external configuration, I would suggest something like:

func makeAssembly(for config: String /* loaded from external source */) -> AssemblyType {
  switch config {
  case "CaseA":
    return MyAssemblyA()
  case "CaseB":
    return MyAssemblyB()
  default:
   fatalError()     
  }
}

Hope this helps 😉