Apollo iOS swift 始终从本地缓存 GraphQl 中获取

Question

当我第一次使用 Apollo 来处理 GraphQl 时 API 每次获取时，只有 Apollo 从服务器获取，否则总是从本地缓存获取

let apollo = ApolloClient(url: URL(string: graphQLEndpoint)!)
let meetingsQuery = AllMeetingsQuery()
apollo.fetch(query: meetingsQuery) { [weak self] result, error in
  guard let meetings = result?.data?.allMeetings else { return }
  print(conferences.count)
  self?.conferences = conferences.map {[=12=].fragments.meetingDetails }
}

Answer 1

来自服务器的每个查询都可以由 CachePolicy

控制

缓存策略，指定是从服务器获取结果还是从本地缓存加载结果。

public enum CachePolicy {
  /// Return data from the cache if available, else fetch results from the server.
  case returnCacheDataElseFetch
  ///  Always fetch results from the server.
  case fetchIgnoringCacheData
  /// Return data from the cache if available, else return nil.
  case returnCacheDataDontFetch
}

默认值是 returnCacheDataElseFetch 这意味着 Apollo return 从缓存中获取数据（如果可用），否则从服务器获取结果。

我通过使用 fetchIgnoringCacheData

更改 cachePolicy 解决了这个问题

apollo.fetch(query: meetingsQuery ,cachePolicy: .fetchIgnoringCacheData)  { [weak self] result, error in
  guard let meetings = result?.data?.allMeetings else { return }
  print(conferences.count)
}

Apollo iOS swift 始终从本地缓存 GraphQl 中获取

Apollo iOS swift Always get from Local cache GraphQl

cache-control

ios

apollo

swift

graphql