取消请求Alamofire

Question

我发送的请求是基于计时器触发的.但是,如果我按下后退按钮,请求似乎仍然处于活动状态,而响应又会导致应用程序崩溃.请建议一种取消请求的方法.

使用Xcode 8.2.1 Swift 3

以下是示例请求:

Alamofire.request(path!, method: .post, parameters: parameters, encoding: JSONEncoding.default, headers: createHeader()).responseJSON {
    response in
    switch response.result {
    case .success(let data):
        success(data as AnyObject?)
    case .failure(let error) :
        failure(error as NSError)
    }
}

甚至尝试在viewDidDisappear上使计时器无效,但没有帮助.

谢谢 !!

Answer 1

Alamofire 4/Swift 3/Xcode 8

您可以取消以下单个请求:

1 - 首先得到请求:

let request = Alamofire.SessionManager.default.request(path!, method: .post, parameters: parameters, encoding: JSONEncoding.default, headers: createHeader()).responseJSON { response in
    switch response.result {
    case .success(let data):
        success(data as AnyObject?)
    case .failure(let error) :
        failure(error as NSError)
    }
}

2 - 然后,在viewDidDisappear中,只需调用:

request.cancel()

您可以取消所有请求,如下所示:

Alamofire.SessionManager.default.session.getTasksWithCompletionHandler { (sessionDataTask, uploadData, downloadData) in
    sessionDataTask.forEach { $0.cancel() }
    uploadData.forEach { $0.cancel() }
    downloadData.forEach { $0.cancel() }
}

Answer 2

你尝试过这个解决方案了吗

let sessionManager = Alamofire.SessionManager.default 
sessionManager.session.getTasksWithCompletionHandler { dataTasks, uploadTasks, downloadTasks in 
dataTasks.forEach { $0.cancel() } 
uploadTasks.forEach { $0.cancel() } 
downloadTasks.forEach { $0.cancel() } 
}

我还添加一个检查来验证这是否是我要取消的请求:

dataTasks.forEach
            {
                if ($0.originalRequest?.url?.absoluteString == url)
                {
                    $0.cancel()
                }
            }

Answer 3

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Alamofire.Session.default.session.getTasksWithCompletionHandler({ dataTasks, uploadTasks, downloadTasks in
            dataTasks.forEach { $0.cancel() }
            uploadTasks.forEach { $0.cancel() }
            downloadTasks.forEach { $0.cancel() }
        })