MZDownloadManager | download manager uses NSURLSession api to download files | Download Utils library

by mzeeshanid Swift Version: 3.3 License: BSD-3-Clause

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | MZDownloadManager Summary

MZDownloadManager is a Swift library typically used in Utilities, Download Utils, Nodejs applications. MZDownloadManager has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

This download manager uses NSURLSession api to download files. It can download multiple files at a time. It can download large files if app is in background. It can resume downloads if app was quit.

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Quality

Security

License

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Support

MZDownloadManager has a medium active ecosystem.

It has 1100 star(s) with 227 fork(s). There are 45 watchers for this library.

It had no major release in the last 12 months.

There are 30 open issues and 47 have been closed. On average issues are closed in 112 days. There are 6 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of MZDownloadManager is 3.3

Quality

MZDownloadManager has no bugs reported.

Security

MZDownloadManager has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

MZDownloadManager is licensed under the BSD-3-Clause License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

MZDownloadManager releases are available to install and integrate.

Installation instructions, examples and code snippets are available.

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MZDownloadManager Key Features

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MZDownloadManager Examples and Code Snippets

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Community Discussions

Trending Discussions on MZDownloadManager

UI freezes after re-entering Detail-VC during URLSession Background-DownloadTask

QUESTION

UI freezes after re-entering Detail-VC during URLSession Background-DownloadTask

Asked 2018-Mar-20 at 01:33

Using Swift-4.0.3, iOS-11.2, Xcode-9.2, iPhone-6S (or Simulator-10.0)

Since about a week I try to figure out what the problem is with the following issue: The UI freezes whenever you re-enter a ViewController that involves a URLSession-Background-DownloadTask. By re-entering, I mean: Going from VC to Detail-VC and back to VC...and then RE-ENTER a second time from VC to the Detail-VC.

Please find my example project here on github : https://github.com/korners/Test00008

The sample project uses the MZDownloadManager from mzeeshanid. I tried also other frameworks - same issue. The MZDownloadManager is just a very nice implementation I found.

Back to the issue: Now - as for the first entry of the Detail-VC: Everything runs smoothly as it should (no issues). Even a closed App will smoothly kick-in to the already running background-downloadTask (no issues - i.e. progressBar and UI-labels update nicely).

But if the user presses the back button on the Detail-VC (top bar of the NavigationController) - from this moment on, the Detail-VC can only be seen in a frozen default-state ! (no UI updates or progressBar-movements anymore whatsoever).

I highly appreciate any help on this !

P.S. By the way, it is not the Segue per se that creates the problems. I also tried instantiating VC from the storyboard - and the same thing: RE-ENTERING freezes the UI :/

...

ANSWER

Answered 2018-Mar-08 at 06:26

After some more debugging I figured out that at the re-enter of the Detail-VC, the delegate of the URLSesssion is nil.

As it turns out - (if set up as background-task) - then the URLSession still existing from a previous download, does not create a new URLSession object but returns the existing one WITH THE OLD DELEGATE OBJECT ATTACHED !!!

The way the project was set up: By pressing the back-button (or leaving the current Detail-VC) will throw away everything form that ViewController (including its downloadManager-property and his delegate). Therefore, if re-entering the Detail-VC then the URLSession kicking in from previous run will try to send its delegate-methods to the URLSession-delegate that no longer exists !!! (i.e. the one killed when leaving the Detail-VC).

Interestingly enough, if the App is closed and re-started, then the delegate of the Background-URL-session can be newly set. The holding on to the delegate is only happening as long as the App is running, obviously.

Thinking loudly, ...one way to go about this, I guess, is for example by keeping a View-object alive (and give it to the background-URLSession as its delegate) and then presenting this View-object whenever there is a need (with addsubView(View) or similar). But in general, it is a bad idea to have unique View-objects throughout the App.

The best way to go about this, I guess, is to create a singleton-URLSession-object in the first place (that survives throughout and is not affected by any Navigation-controller segue'ing). And therefore also its delegate survives throughout the App.

My take-home message for now: BE CAREFUL WHO YOU ASSIGN TO THE BACKGROUND-URLSESSION TO BE ITS DELEGATE AND WHAT YOUR APP-LIFECYCLE DOES WITH IT (it won't easily let go of it - not even if the URLSession object (and its delegate together with it) are dead. ;) It will only let go of it if you close the App and re-start)

Hope, I got that all right ?

Any suggestions or comments to this subject highly appreciated !

Source https://stackoverflow.com/questions/49132845

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install MZDownloadManager

MZDownloadManager is available through CocoaPods. To install it, simply add the following line to your Podfile:.
In Xcode 11+ Select File > Packages > Add Package Dependency....
Enter this project's URL: https://github.com/mzeeshanid/MZDownloadManager.git

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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