Question

我有一个获得API请求的功能我还有一个searchBar来搜索服务器数据我想在用户输入每个字符时取消之前的请求我搜索关键字＆＃34; flatMapLatest＆＃34;。但我不知道如何使用＆＃34; flatMapLatest＆＃34;在我的情况下取消先前的请求我尝试但是我失败了对我有任何建议吗？
感谢。

func requestTest(_ method: Alamofire.HTTPMethod, url:String, params:[String:Any] = [:], callback: @escaping (JSON) -> Void) {

    var headers:[String:String] = [String:String]()
    if user.token.isEmpty == false {
        headers["Authorization"] = "Bearer \(user.token)"
    }

    let configuration = URLSessionConfiguration.default
    configuration.httpAdditionalHeaders = SessionManager.defaultHTTPHeaders
    configuration.timeoutIntervalForRequest = timeout

    _ = SessionManager(configuration: configuration)
        .rx.responseJSON(method,
                         url,
                         parameters: params,
                         encoding: ((method == .get) ? URLEncoding.default : JSONEncoding.default),
                         headers: headers)
        .subscribeOn(SerialDispatchQueueScheduler.init(qos: .background))
        .flatMapLatest({ (<#(HTTPURLResponse, Any)#>) -> ObservableConvertibleType in
          //I fail to get request.
        })
        .subscribe(onNext: { (r, data) in

            let json = JSON(data)

            if json["status"].stringValue == "success" {

                callback(json["request"])       
            }
            else {
                callback(json)
            }
        }, onError: { (error) in

            callback(JSON(error))
        })
        .addDisposableTo(DisposeBag)
}

Answer 1

使用 .switchLatest（），就像那样 -

    let responseSubject: PublishSubject<Observable<Response>> = PublishSubject()
    let latestResponse: Observable<Response> = responseSubject.switchLatest() // subscribe to it
    // call 'responseSubject.onNext(newRequestObservable)' whenever you need a new request

如何使用RxSwift取消之前的请求

1 个答案: