ios - 设置默认缓存策略 apollo swift

Question

有没有办法在swift中设置Apollo框架的默认缓存策略？

我知道我可以通过 cachePolicy 参数以这种方式为每个获取请求设置缓存策略:

Apollo.shared.client.fetch(query: getUser, cachePolicy: CachePolicy.fetchIgnoringCacheData)

但我正在寻找一种方法来为所有请求在 client 对象中设置缓存策略。

Answer 1

查看源代码，没有可以为 ApolloClient 设置的方法或 cachePolicy 变量。

你可以创建一个单例的 Apollo 客户端类，并添加你自己的具有所需缓存策略的获取方法，就像这样

class ApolloManager {

    static let shared = Apollo()

    private var client: ApolloClient!
    var store: ApolloStore { return self.client.store }

    static func configure(url: URL, configuration: URLSessionConfiguration? = nil) {
        let store = ApolloStore(cache: InMemoryNormalizedCache())
        Apollo.shared.client = ApolloClient(networkTransport: HTTPNetworkTransport(url: url, configuration: configuration ?? .default), store: store)
    }

    @discardableResult
    func fetch<Query: GraphQLQuery>(query: Query, cachePolicy: CachePolicy = .fetchIgnoringCacheData, queue: DispatchQueue = .main, resultHandler: OperationResultHandler<Query>? = nil) -> Cancellable? {
        return self.client.fetch(query: query, cachePolicy: cachePolicy, queue: queue, resultHandler: resultHandler)
    }

}

Initializer可以在AppDelegate.swift的didFinishLaunchingWithOptions方法中添加

let url = URL(string: "http://192.168.1.4:2223")!
ApolloManager.configure(url: url)

您还可以使用配置初始化您的客户端

let configuration = URLSessionConfiguration.default
configuration.httpAdditionalHeaders = ["Authorization": "token"]
ApolloManager.configure(url: url, configuration: configuration)

用法

ApolloManager.shared.fetch(query: getUser)