Apollo iOS 客户端 - 等待响应

如何解决Apollo iOS 客户端 - 等待响应

我是 iOS 开发的新手，想知道如何在调用 test2() 之前等待 Apollo iOS 客户端代码完成，示例代码如下：

func test() {
    Network.shared.apollo.perform(mutation: AnonymousAccesstokenMutation()) { result in
        guard let data = try? result.get().data else { return }
        print(data.anonymousAccesstoken.anonymousAccesstoken)
        Constants.User.anonymousAccesstoken = "Bearer " + data.anonymousAccesstoken.anonymousAccesstoken!
    }
    // wait for above code to complete before resuming
    test2()
}