CODEWITHSUNDEEP
iosdownloadnsurlsession
serg_ov
serg_ov

Reputation: 563

ios: NSURLSessionDataTask and download from different views

I now try to implement background file download in my ios app, and i'm a little bit confused... I have got a lot of different views in my app, and i want to start downloading files from many of them, and display progress in the view been presented. The first part of my aim (downloading files) was implemented by creating one NSURLSession in app delegate, so i can get it in any view and start downloading a file.

In AppDelegat

NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier: @"com.myEnglishLessons"];
sessionConfiguration.HTTPMaximumConnectionsPerHost = 111;
self.currentSession = [NSURLSession sessionWithConfiguration:sessionConfiguration
                                                    delegate:nil
                                               delegateQueue:nil];

In some view

NSURLSessionDataTask *downloadTask = [[(AppDelegate *)[[UIApplication sharedApplication] delegate] currentSession] downloadTaskWithURL: myURL];
[downloadTask resume];

That all works good, but what's the problem - i can't handle and show progress in the view. Delegate of NSURLSession is appDelegate, so it receives events of downloading process, but not the class of the view. What can you suggest me?

Upvotes: 0

Views: 206

Answers (1)

kabarga
kabarga

Reputation: 803

You can use downloadTask.taskDescription to set the view id or view class name. So when you create the task from the view you could write like:

NSURLSessionDataTask *downloadTask = [[(AppDelegate *)[[UIApplication sharedApplication] delegate] currentSession] downloadTaskWithURL: myURL];
[downloadTask setTaskDescription:NSStringFromClass([self class])];
[downloadTask resume];

Then you can send the notification in progress URLSession method:

    CGFloat progress = (CGFloat)totalBytesWritten/totalBytesExpectedToWrite;
    [[NSNotificationCenter defaultCenter] postNotificationName:kDownloadTaskProgressNotification object:nil
                                                      userInfo:@{@"progress": @(progress), @"viewClass": downloadTask.taskDescription];

and all views should observe this notification. also you need to add a class check when you get the notification.

Upvotes: 1

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