无法使用自定义 DelegateProxy 和协议接收事件

Question

我尝试将 DifficultyViewDelegate 的委托迁移到 observable。这是我的 DifficultyViewDelegate ：

@objc protocol DifficultyViewDelegate: class {
  func levelDidIncrease()
  func levelDidDecrease()
}

还有我的难度视图：

  weak var delegate: DifficultyViewDelegate?

  @IBAction func decreaseLevel(_ sender: Any) {
    delegate?.levelDidDecrease()
  }

  @IBAction func increaseLevel(_ sender: Any) {
    delegate?.levelDidIncrease()
  }

这是我的 RxDifficultyViewDelegateProxy

class RxDifficultyViewDelegateProxy: DelegateProxy, DelegateProxyType {
  static func currentDelegateFor(_ object: AnyObject) -> AnyObject? {
    let difficultyView: DifficultyView = object as! DifficultyView
    return difficultyView.delegate
  }

  static func setCurrentDelegate(_ delegate: AnyObject?, toObject object: AnyObject) {
    let difficultyView: DifficultyView = object as! DifficultyView
    difficultyView.delegate = delegate as? DifficultyViewDelegate
  }
}

我还在 DifficultyView 上添加了一个扩展：

extension DifficultyView {
  public var rx_delegate: RxDifficultyViewDelegateProxy {
    return  RxDifficultyViewDelegateProxy.proxyForObject(RxDifficultyViewDelegateProxy.self)
  }

  public var rx_levelDidIncrease: Observable<Void> {
    return rx_delegate.methodInvoked(#selector(DifficultyViewDelegate.levelDidIncrease)).map { _ in return }
  }
}

但似乎当我这样做时：

difficultyView.rx_levelDidIncrease.asObservable().subscribe(onNext: {
  print("did increase")
}).addDisposableTo(disposeBag)

它从来没有被调用过。有人有什么指点吗？

Answer 1

尝试使用PublishSubject:

难度查看：

class DifficultyView: UIView {
    var levelDidIncrease = PublishSubject<Void>()
    var levelDidDecrease = PublishSubject<Void>()

    @IBAction func decreaseLevel(_ sender: Any) {
        levelDidDecrease.onNext()
    }

    @IBAction func increaseLevel(_ sender: Any) {
        levelDidIncrease.onNext()
   }
}

然后：

var difficultyView = DifficultyView()

difficultyView.levelDidDecrease.asObservable()
    .subscribe(onNext: {
        print("did decrease")
    })
    .addDisposableTo(disposeBag)


difficultyView.decreaseLevel(theSender) // <- THIS line performs the side effect