CODEWITHSUNDEEP
iosobjective-casynchronousdownload
Lucas Brito
Lucas Brito

Reputation: 1028

Is that any way to access a variable from inside completionHandler block?

Is that any way to access a variable from outside a the completionHandler block? I'm developing a bandwidth speed test and need to do that. Maybe have another way so I hope you can help me.

My code:

NSTimer *myTimer;


[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]
                           completionHandler: ^(NSURLResponse *response, NSData *data, NSError *error)
     {
         NSTimeInterval timeInterval = [start timeIntervalSinceNow];
         NSLog(@"DOWNLOAD COMPLETED IN %f", timeInterval );
         [myTimer invalidate];
     }];

myTimer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                               target:self
                                             selector:@selector(count:)
                                             userInfo:data //variable from completionHandlerBlock
                                              repeats:YES];

Here what I'm trying to do: when send the request and the arrive in the NStimer scheduledTimerWithTimeInterval I want to access the variable data to know exactly size and after the download over, invalidate my NStimer inside the completionHandler how I did. Thanks in advanced.

Upvotes: 0

Views: 178

Answers (1)

Wain
Wain

Reputation: 119031

You don't have access to data until the download is complete, so you can't use it in a timer before then. You need to rethink what you're trying to do and how you're trying to do it.

You need to use the NSURLConnection with a delegate and the delegate methods connection:didReceiveResponse: (which will tell you how much data to expect) and connection:didReceiveData: (which will be called repeatedly with blocks of data).

At the start of the connection response, save the current date (this is after the server connection has been configured):

NSDate *startDate = [NSDate date];

Each time you get a block of data, you can check the size of the new data, store the total data and check the time:

 NSTimeInterval timeInterval = [[NSDate date] timeIntervalSinceDate:startDate];

 NSLog(@"DOWNLOAD duration %f with data size: %lu", timeInterval, [data length]);

Upvotes: 2

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