Using AFNetworking 2.0 with background tasks
I'm having issues implementing background tasks using AFURLSessionManager. I'm creating a new AFHTTPSessionManager with BaseURL and SessionConfiguration, using NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier: and using the convenience method to create a POST request.
When I run my app, the first request is sent normally, but the second one returns A background URLSession with identifier {ID} already exists! and it crashes the app.
I've watched Apple's WWDC 2013 videos and they suggest you to create the Session Configuration only once, by using
dispatch_once(&onceToken, ^{
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration backgroundSessionConfiguration:@"com.yourcompany.appId.BackgroundSession"];
session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
});
However there session property for AFURLSessionManager is set as readonly and there is no way for me to pass a custom NSURLSession, only a NSURLSessionConfiguration, that is created inside AFURLSessionManager:init :
self.session = [NSURLSession sessionWithConfiguration:self.sessionConfiguration delegate:self delegateQueue:self.operationQueue];
I feel like I'm doing something wrong, but how else can I support background tasks using AFNetworking?
It is correct that you cannot instantiate a new AFHTTPSessionManager and then change its session to reference some singleton NSURLSession . So, instead, you should make the AFHTTPSessionManager object, itself, the shared instance which you can reuse throughout the app.
At the end of this answer, I provide an example of using AFNetworking for background sessions.
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