Single

发出一个元素，或一个 error 事件
不会共享附加作用

let obserable5 = Single<[String : Any]>.create { single in

       //成功
           single(.success(["state" : "success"]))
       // 失败
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// let error = NSError(domain: “失败”, code: 0, userInfo: nil)
// single(.error(error))

           return Disposables.create();
       }
       obserable5.subscribe { (onNext) in
           print("成功 : ",onNext)
       } onFailure: { (error) in
           print("失败")
       } onDisposed: {
           print("销毁")
       }
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Completable

        let obserable6 = Completable.create { (completable) -> Disposable in
            let error = NSError(domain: "Completable 失败", code: 0, userInfo: nil)
            completable(.error(error))
            completable(.completed)
            return Disposables.create();
        }
        
        obserable6.subscribe {
            print("完成")
        } onError: { (error) in
            print(error)
        } onDisposed: {
            print("销毁")
        }

completed
Error Domain=Completable 失败 Code=0 "(null)"
销毁
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Maybe

func generateString() -> Maybe<String> {
    return Maybe<String>.create { maybe in
        maybe(.success("RxSwift"))

        // OR

        maybe(.completed)

        // OR

        maybe(.error(error))

        return Disposables.create {}
    }
}

generateString()
    .subscribe(onSuccess: { element in
        print("Completed with element \(element)")
    }, onError: { error in
        print("Completed with an error \(error.localizedDescription)")
    }, onCompleted: {
        print("Completed with no element")
    })
    .disposed(by: disposeBag)
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Signal

在同样的场景中，Signal 不会把上一次的点击事件回放给新观察者，而只会将订阅后产生的点击事件，发布给新观察者

             let obserable7 = button.rx.tap.asSignal();
        event = button.rx.tap.asSignal()
        let observerAction: () -> Void = { [self] in tapActin() }
        event!.emit(onNext: observerAction)

 func tapActin() {
        print("按钮点击弹出")
        let newObserver: () -> Void = { print("内部监听弹窗") }
        event!.emit(onNext: newObserver)


    }


打印 点击第一次
按钮点击弹出
点击第二次
按钮点击弹出
内部监听弹窗
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