ios - 未调用委托(delegate)字段时实现 `DelegateProxy` (RxSwift/RxCocoa) `delegate`

Question

我需要一些关于 DelegateProxy 的帮助执行。具体来说，当委托(delegate)字段的名称不同于简单的 delegate 时，正确的实现方式是什么？ ？如 SKPhysicsContactDelegate它叫做contactDelegate .我尝试定义一个计算值 delegate , 但它并没有起到作用 - https://github.com/maxvol/RxSpriteKit/blob/master/Proxy/RxSKPhysicsContactDelegateProxy.swift

它失败了 "DelegateProxy has no factory of <PKPhysicsWorld: 0x280b18990>. Implement DelegateProxy subclass for <PKPhysicsWorld: 0x280b18990> first."也许它甚至与委托(delegate)字段名称无关，但这是我能找到的与正常工作的代理的唯一区别。

更新:哈!我刚刚注意到错误消息显示 PKPhysicsWorld , 不是 SKPhysicsWorld .所以我的假设是它与 object 的事实有关。在DelegateProxyFactory.createProxy是 PKPhysicsWorld而不是 SKPhysicsWorld和 _factories[ObjectIdentifier(mirror.subjectType)]返回 nil .

Answer 1

您收到该错误的原因是您的 registerKnownImplementations() 函数没有运行。

以下要点应该有效:https://gist.github.com/dtartaglia/9f1f937628504ca56dbb1aac7d91df2b

代码也在下面，但要点可以保持最新:

//
//  SKPhysicsWorld+Rx.swift
//
//  Created by Daniel Tartaglia on 21 Jan 2019.
//  Copyright © 2019 Daniel Tartaglia. MIT License.
//

import RxSwift
import SpriteKit

public
extension Reactive where Base: SKPhysicsWorld {

    var didBegin: Observable<SKPhysicsContact> {
        return Observable.create { observer in
            physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
            let uuid = UUID()
            if let (delegate, beginners, enders) = physicsContatctDelegates[self.base] {
                var new = beginners
                new[uuid] = observer
                physicsContatctDelegates[self.base] = (delegate, new, enders)
            }
            else {
                let delegate = PhysicsContactDelegate(for: self.base)
                self.base.contactDelegate = delegate
                physicsContatctDelegates[self.base] = (delegate, [uuid: observer], [:])
            }

            return Disposables.create {
                physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
                let (delegate, beginners, enders) = physicsContatctDelegates[self.base]!
                var new = beginners
                new.removeValue(forKey: uuid)
                if new.isEmpty && enders.isEmpty {
                    physicsContatctDelegates.removeValue(forKey: self.base)
                }
                else {
                    physicsContatctDelegates[self.base] = (delegate, new, enders)
                }
            }
        }
    }

    var didEnd: Observable<SKPhysicsContact> {
        return Observable.create { observer in
            physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
            let uuid = UUID()
            if let (delegate, beginners, enders) = physicsContatctDelegates[self.base] {
                var new = enders
                new[uuid] = observer
                physicsContatctDelegates[self.base] = (delegate, beginners, new)
            }
            else {
                let delegate = PhysicsContactDelegate(for: self.base)
                self.base.contactDelegate = delegate
                physicsContatctDelegates[self.base] = (delegate, [:], [uuid: observer])
            }

            return Disposables.create {
                physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
                let (delegate, beginners, enders) = physicsContatctDelegates[self.base]!
                var new = enders
                new.removeValue(forKey: uuid)
                if new.isEmpty && enders.isEmpty {
                    physicsContatctDelegates.removeValue(forKey: self.base)
                }
                else {
                    physicsContatctDelegates[self.base] = (delegate, beginners, new)
                }
            }
        }
    }
}

private
class PhysicsContactDelegate: NSObject, SKPhysicsContactDelegate {

    init(for world: SKPhysicsWorld) {
        self.world = world
        super.init()
    }

    func didBegin(_ contact: SKPhysicsContact) {
        physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
        let (_, beginners, _) = physicsContatctDelegates[world]!
        for each in beginners.values {
            each.onNext(contact)
        }
    }

    func didEnd(_ contact: SKPhysicsContact) {
        physicsContatctDelegatesLock.lock(); defer { physicsContatctDelegatesLock.unlock() }
        let (_, _, enders) = physicsContatctDelegates[world]!
        for each in enders.values {
            each.onNext(contact)
        }
    }

    let world: SKPhysicsWorld
}

private let physicsContatctDelegatesLock = NSRecursiveLock()
private var physicsContatctDelegates: [SKPhysicsWorld: (SKPhysicsContactDelegate, [UUID: AnyObserver<SKPhysicsContact>], [UUID: AnyObserver<SKPhysicsContact>])] = [:]