swift - 如何解决“无法使用类型为'(eventStore:EventStoring)'的参数列表调用'createEvent'”

我正在和EventKit'sEKEventStore一起工作，我想模仿它，同时也模仿EKEvent。
但我不知道如何正确地抽象和其他方法。

protocol EventStoring {

    associated type Event: EventStoreEvent where Event.MatchingEventStore == Self

    func save(_ event: Event, span: EKSpan, commit: Bool) throws

    // Other methods of EKEventStore I use
 }

extension EKEventStore: EventStoring {
    typealias Event = EKEvent
}

protocol EventStoreEvent {
    associatedtype MatchingEventStore: EventStoring

    static func createEvent(eventStore: MatchingEventStore) -> Self
}

extension EKEvent: EventStoreEvent {
    typealias MatchingEventStore = EKEventStore

    static func createEvent(eventStore: MatchingEventStore) -> Self {
        return EKEvent(eventStore: eventStore) as! Self
    }
}

这里的错误是：“Self”只在协议中可用，或者是作为类中方法的结果；您的意思是EKEvent's
并且：“无法将init(eventStore: EKEventStore)类型的返回表达式转换为返回类型'Self'”

class GenericEventManger<StoreEvent: EventStoreEvent> {

    var store: EventStoring

    required init(with eventStore: EventStoring) {
        self.store = eventStore
    }

    func createEvent() -> StoreEvent {
        let eventStoreEvent: EventStoreEvent = StoreEvent.createEvent(eventStore: store)

    // Then some code where I configure the event...

    try store.save(eventStoreEvent, span: .thisEvent, commit: true)
    }
}

最后一行的第七个错误是：不能用'EKEvent'类型的参数列表调用'EKEvent'
最后一个是：不能用'createEvent'类型的参数列表调用“save”
由于我修改了Dan的建议，所以在我的实现中出现了另一个类似的问题，所以我更新了我的问题

最佳答案

我想在丹的帮助下，我找到了其中两个问题的解决方案，但我还没有彻底测试：
首先我改变了store属性的类型，就像Dan推荐的那样

class GenericStoreManger<StoreEvent: EventStoreEvent> {

    var store: StoreEvent.MatchingEventStore

    func createEvent() -> StoreEvent {
    let eventStoreEvent: EventStoreEvent = StoreEvent.createEvent(eventStore: store)

    // Then some code where I configure the event...

    try store.save(eventStoreEvent as! StoreEvent.MatchingEventStore.Event, span: .thisEvent, commit: true)
}

    ...

}

然后我改变了如何在GenericStoreManager中获取返回值，这样它也可以在EKEvent的子类中工作

extension EKEvent: EventStoreEvent {
    typealias MatchingEventStore = EKEventStore

    static func createEvent(eventStore: MatchingEventStore) -> Self {
        return self.init(eventStore: eventStore)
    }
}

关于swift - 如何解决“无法使用类型为'(eventStore:EventStoring)'的参数列表调用'createEvent'”，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/54406371/