Combine中类似Rxswift中的onNext

其实Comibne中也有类似的方法
就是它handleEvents

cancellable = integers.publisher
    .handleEvents(receiveSubscription: { subs in
        print("Subscription: \(subs.combineIdentifier)")
    }, receiveOutput: { anInt in
        print("in output handler, received \(anInt)")
    }, receiveCompletion: { _ in
        print("in completion handler")
    }, receiveCancel: {
        print("received cancel")
    }, receiveRequest: { (demand) in
        print("received demand: \(demand.description)")
    })
    .sink { _ in return }

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