TL;DR

我想推迟出版，但不知道如何，呃，合并的部分

简要

我有一个Publisher

let generator = PassthroughSubject<Bool, Never>()

想用修饰语

.delay(for: 2, scheduler: RunLoop.main)

这样我打电话的时候

generator.send(true)

消息在呼叫send()两秒钟后发送
查看Publishers.Delay的文档可以更清楚地看到类型错误，但并不能帮助我找到正确的方法来连接。

编码

import SwiftUI
import Combine

// Exists just to subscribe.
struct ContainedView : View {
    private let publisher: AnyPublisher<Bool, Never>
    init(_ publisher: AnyPublisher<Bool, Never> = Just(false).dropFirst().eraseToAnyPublisher()) {
        self.publisher = publisher
    }
    var body: some View {
        Rectangle().onReceive(publisher) { _ in print("Got it") }
    }
}

struct ContentView: View {
    let generator = PassthroughSubject<Bool, Never>()
                 // .delay(for: 2, scheduler: RunLoop.main)
                 // Putting it here doesn't work either.

    var body: some View {
        VStack {
            Button("Tap") {

                // Does not compile
                self.generator.delay(for: 2, scheduler: RunLoop.main).send(true)
                // Value of type 'Publishers.Delay<PassthroughSubject<Bool, Never>, RunLoop>' has no member 'send'
                // https://developer.apple.com/documentation/combine/publishers/delay

                // Does not compile
                self.generator.send(true).delay(for: 2, scheduler: RunLoop.main)
                // Value of tuple type '()' has no member 'delay'

                // Just a broken-up version of the first try.
                let delayed = self.generator.delay(for: 2, scheduler: RunLoop.main)
                delayed.send(true)

                // This, of course, builds and works.
                self.generator.send(true)
                print("Sent it")
            }

            ContainedView(generator.eraseToAnyPublisher())
            .frame(width: 300, height: 200)
        }
    }
}