[英]WidgetKit not calling urlSessionDidFinishEvents
I'm trying to implement downloading timeline data in a widget and so I created a background URLSession
with a corresponding data task to download the JSON:我正在尝试在小部件中实现下载时间线数据,因此我创建了一个具有相应数据任务的后台
URLSession
来下载 JSON:
let session = URLSession(
configuration: .background(withIdentifier: identifier),
delegate: self,
delegateQueue: nil
)
let request = URLRequest(url: ...)
session.dataTask(with: request).resume()
On my widget I then added the onBackgroundURLSessionEvents
to store the completion handler, as per the Apple docs:然后,根据 Apple 文档,在我的小部件上添加了
onBackgroundURLSessionEvents
来存储完成处理程序:
.onBackgroundURLSessionEvents { identifier in
return SessionCache.shared.isValid(for: identifier)
} _: { identifier, completion in
let data = SessionCache.shared.sessionData(for: identifier)
data.sessionCompletion = completion
}
However, neither the urlSessionDidFinishEvents(forBackgroundURLSession:)
nor the onBackgroundURLSessionEvents
methods are called.然而,
urlSessionDidFinishEvents(forBackgroundURLSession:)
和onBackgroundURLSessionEvents
方法都没有被调用。 When the.network download completes, it just calls the normal urlSession(_:task:didCompleteWithError:)
method.当 .network 下载完成时,它只是调用正常的
urlSession(_:task:didCompleteWithError:)
方法。
I'm clearly missing something here, but I'm just not seeing what.我显然在这里遗漏了一些东西,但我只是没有看到什么。
Apple's documentation isn't 100% clear on this, but you need to use URLSession.downloadTask
instead of dataTask
for background sessions. Apple 的文档对此并非 100% 清楚,但您需要使用
URLSession.downloadTask
而不是dataTask
进行后台会话。 URLSessionDataTask
s deliver bytes to those specific delegate methods in your in-memory process. URLSessionDataTask
将字节传递给内存中进程中的那些特定委托方法。 Background download & upload tasks are handed off to nsurlsessiond
and only delivered back to your app when they are fully resolved.后台下载和上传任务被移交给
nsurlsessiond
,只有在它们完全解决后才会返回给您的应用程序。
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