Swift找不到协议保证的方法

Question

我试图提出一种方法，以减少将Cleanse注入依赖关系到ViewController的样板代码。 但是，绝对Cleanse.Component我的Cleanse.Component样板放在类型擦除类中。 我究竟做错了什么？

（为了方便阅读，包括Code和XCode快照）

import Foundation
import Cleanse

protocol CleanseInjectable {
    func inject(args: Any...) -> Void
    func prepare() -> Void
}

extension CleanseInjectable {
    func inject(args: Any...) -> Void {

    }
}

class AnyCleansePropertyInjectionComponent<TargetType: AnyObject, CleanseInjectable>: Cleanse.Component {
    typealias Root = PropertyInjector<TargetType>

    func configure<B : Binder>(binder binder: B) {
        binder
            .bindPropertyInjectionOf(TargetType.self)
            .to(injector: (TargetType.self as! CleanseInjectable.Type).inject)
    }
}

我得到的错误与任何Swift协议错误一样奇怪，后者仅在事后才显而易见： Type 'CleanseInjectable' has no member 'inject'吗？

Answer 1

此修订版似乎已修复该错误！ 看来Swift不能理解TargetType: AnyObject, CleanseInjectable在约束方面等效于protocol CleanseInjectable: class 。

import Cleanse

protocol CleanseInjectable: class {
    func inject(args: Any...) -> Void
    func prepare() -> Void
}

extension CleanseInjectable {
    func inject(args: Any...) -> Void {

    }
}

class AnyCleansePropertyInjectionComponent<TargetType: CleanseInjectable>: Cleanse.Component {
    typealias Root = PropertyInjector<TargetType>

    func configure<B : Binder>(binder binder: B) {
        binder
            .bindPropertyInjectionOf(TargetType.self)
            .to(injector: TargetType.inject)
    }
}

---

编辑：我完成的Cleanse样板去除器（在运行时未经试用，将尽快更新），以带来乐趣和启发！

import Cleanse

protocol CleanseInjectable: class {
    var cleanseComponent: AnyCleansePropertyInjectionComponent<Self>? { get }
    func inject(args: Any...) -> Void
    func prepare() -> Void
}

extension CleanseInjectable {
    func inject(args: Any...) -> Void {
        // Override me to do something useful, brah!
    }

    func prepare() -> Void {
        if (cleanseComponent != nil) {
            (try! cleanseComponent!.build()).injectProperties(into: self)
        }
    }
}

class AnyCleansePropertyInjectionComponent<TargetType: CleanseInjectable>: Cleanse.Component {
    typealias Root = PropertyInjector<TargetType>

    func configure<B : Binder>(binder binder: B) {
        binder
            .bindPropertyInjectionOf(TargetType.self)
            .to(injector: TargetType.inject)
    }
}