Custom Delegate is not calling from NSURLSessionDelegates

Question

I am using NSURLSession for service integration. While uploading an image in to server, I want to show the percentage of data that has been uploaded to server. For that, i created a custom delegate in my service model class, and calling this delegate inside NSURLSession's delegate. Please check my code below.

-(void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task didSendBodyData:(int64_t)bytesSent totalBytesSent:(int64_t)totalBytesSent totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend {
NSLog(@" %lld    %lld    %lld %lu", bytesSent , totalBytesSent,totalBytesExpectedToSend,(unsigned long)task.taskIdentifier);

float dataSent = (totalBytesSent/totalBytesExpectedToSend);

NSLog(@"sent percentage : %0.2f",(dataSent * 100));
dispatch_async(dispatch_get_main_queue(), ^{

//_delegate is my custom delegate
    [_delegate updateUploadedDataInfo:dataSent];
});
}

But, [_delegate updateUploadedDataInfo:dataSent] method is not calling here. Please suggest, where i am doing wrong.

Answer 1

Just add your service model object as delegate. Eg assume your servcice model class is MyModel and your posted code is in another class MyDownloader. In your MyModel class add:

MyDonlowder *downlowder = [[MyDownloader alloc] init];
downlowder.delegate = self;

Also make your MyModel class conform to MyCystomDelegateProtocol and implement the required method updateUploadedDataInfo .