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Forum Discussion
Downloading in the background in iOS (Swift)
Hello, I'm using file download from Dropbox in my app. It works fine when app is active, but if my app goes into the background the download stops. How can I solve it? I use this code to download: ...
Hello, Greg!
I have new information regarding my question. On what do you run the code on a real device or on the Xcode simulator? I've always tested on a real device and was getting this issue. I decided to test it on the simulator and was very surprised that the download works fine on it. I also noticed that when I run the code on a real device - I get this issue, but if I then click to download another file, then I'll see that the first file is immediately downloaded, as if it had already been downloaded, but the completion handler didn't work.
What could be the issue? Why does it work fine on the simulator?
P.S. This issue happens only in case when device connected to the PC (Xcode), when I run app without connection to the PC the download works fine.
Greg-DB
Dropbox Staff
Dropbox StaffThanks for the report. First, can you let me know the version number of the SwiftyDropbox SDK you're using?
Also, when you say "the download stops", do you get any error or output? And, do you get any result when you return to the app?
I use 6.0.3 version of SwiftyDropbox. No, I don't get any error. When I return to the app I see that download isn't complete. If you look at my code you'll see that I have completion handler which works when dowload is complete, and after return to the app I see that it didn't work.
Also in the downloadFile func I get download progress (I didn't include it in the question so as not to complicate)
.progress { progressData in
let progress = Double(progressData.fractionCompleted)
completion(progress)
print(progress)
}
When I start downloading a file and then minimize the application, then I'll see that progress stops and it doesn't start again if I return to the app
- Greg-DB
Thanks for the additional information. I just tried reproducing this with the code you provided. While I also see the progress reporting stop when the app is sent to the background, if I then bring it back to the foreground the download does then resume and complete.
Can you let me know how long you're leaving the app in the background before resuming it? Also, what version(s) of iOS are you seeing this with?
I leave the application in the background for a few seconds. I also tried leaving it on for a few minutes. The result is the same. I'm using iOS 14.
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