Question

假设我在名为Registry的模块中定义了一个注册表：

class Registry {
  static let sharedInstance = Registry()
  registerImplementation(implementation: AnyClass, forInterface interface: Protocol) {...}
  implementationForInterface(interface: Protocol) -> AnyClass {...}
}

分别在模块FooServiceAPI和FooServiceImplementation中的API和实现。

// In FooServiceAPI target:
protocol FooService {
  ...
}

// In FooServiceImplementation target:
import FooServiceAPI
import Registry

// This line causes an error saying that code cannot be executed at the top level.
Registry.sharedInstance.registerInterface(FooService, forImplementation: FooServiceImplementation)

class FooServiceImplementation: FooService {
  ...
}

我希望FooServiceImplementation在FooServiceAPI接口的Registry中自动注册，以便其他类可以像这样使用它们：

import Registry
import FooServiceAPI

class Bar {
  func baz() {
    let fooService: FooService = Registry.sharedInstance.implementationForInterface(FooService)
    ...
  }
}

如何在不强制应用程序单独注册AppDelegate中的实现的情况下完成此操作？谢谢！

如何在加载模块时执行的Swift文件中编写代码？

0 个答案: