xcode 取消请求 Alamofire
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Cancel a request Alamofire
提问by Ankit Kumar Gupta
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.
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，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。请提出一种取消请求的方法。
Using Xcode 8.2.1 Swift 3
使用 Xcode 8.2.1 Swift 3
Here is the sample request :
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)
}
}
Even tried invalidating the timer on viewDidDisappear but to no help.
甚至尝试使 viewDidDisappear 上的计时器无效，但无济于事。
Thanks !!
谢谢 ！！
回答by Enrique
Alamofire 4 / Swift 3 / Xcode 8
阿拉莫菲尔 4 / Swift 3 / Xcode 8
You can cancel a single requestas below:
您可以取消单个请求，如下所示：
1 - First get the request:
1 - 首先获取请求：
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 - Then, in your viewDidDisappear, just call:
2 - 然后，在您的viewDidDisappear 中，只需调用：
request.cancel()
request.cancel()
You can cancel all requestsas below:
您可以取消所有请求，如下所示：
Alamofire.SessionManager.default.session.getTasksWithCompletionHandler { (sessionDataTask, uploadData, downloadData) in
sessionDataTask.forEach { let sessionManager = Alamofire.SessionManager.default
sessionManager.session.getTasksWithCompletionHandler { dataTasks, uploadTasks, downloadTasks in
dataTasks.forEach { dataTasks.forEach
{
if (manager.session.invalidateAndCancel()
.originalRequest?.url?.absoluteString == url)
{
##代码##.cancel()
}
}
.cancel() }
uploadTasks.forEach { ##代码##.cancel() }
downloadTasks.forEach { ##代码##.cancel() }
}
.cancel() }
uploadData.forEach { ##代码##.cancel() }
downloadData.forEach { ##代码##.cancel() }
}
回答by Constantin Saulenco
回答by zero3nna
How about this:
这个怎么样：
##代码##回答by Cody
In case it helps anyone, in my case I had a RequestRetrier on the SessionManager that retried the request after it was canceled, so be sure to check there!
如果它对任何人有帮助，就我而言，我在 SessionManager 上有一个 RequestRetrier，它在取消后重试请求，所以一定要检查那里！
