如何从Alamofire回报价值

如何从Alamofire回报价值

正如mattt指出的那样，Alamofire通过“完成处理程序”模式异步返回数据，因此您必须执行相同的 *** 作。您不能只是

return

立即获取值，而是要更改方法以不返回任何内容，而要使用完成处理程序关闭模式。

如今，它可能看起来像：

func getOrders(completionHandler: @escaping (Result<[String: Any]>) -> Void) {    performRequest("orders", completion: completionHandler)}func performRequest(_ section: String, completion: @escaping (Result<[String: Any]>) -> Void) {    let url = baseURL.appendingPathComponent(section)    let params = ["consumer_key": "key", "consumer_secret": "secret"]    Alamofire.request(url, parameters: params)        .authenticate(user: consumerKey, password: consumerSecret)        .responseJSON { response in switch response.result { case .success(let value as [String: Any]):     completion(.success(value)) case .failure(let error):     completion(.failure(error)) default:     fatalError("received non-dictionary JSON response") }    }}

Then, when you want to call it, you use this

completion

closure parameter
(in trailing closure, if you want):

api.getOrders { result in    switch result {    case .failure(let error):        print(error)    case .success(let value):        // use `value` here    }}// but don't try to use the `error` or `value`, as the above closure// has not yet been called//