取消请求Alamofire [英] Cancel a request Alamofire

问题描述

我正在发送一个基于计时器触发的请求。但是，如果我按下后退按钮，该请求似乎仍然处于活动状态，并且响应反过来使应用程序崩溃。请提出一种取消请求的方法。

I am sending a request which is triggered based on timer. But if I press the back button the request still seems to be active and the response in turns crashes the app. Kindly suggest a way to cancel the request.

使用Xcode 8.2.1
Swift 3

Using Xcode 8.2.1 Swift 3

这是示例请求：

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)
    }
}

甚至尝试使viewDidDisappear上的计时器无效，但无济于事。

Even tried invalidating the timer on viewDidDisappear but to no help.

谢谢！

推荐答案

Alamofire 4 / Swift 3 / Xcode 8

您可以取消单个请求 >如下所示：

1-首先收到请求：

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，在您的 viewDidDisappear 中，只需调用：

2 - Then, in your viewDidDisappear, just call:

request.cancel （）

您可以取消所有请求，如下所示：

You can cancel all requests as below:

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

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