track the progress with ASIHTTPRequest

i am trying to communicate to web-service and to retrieve data, while doing that, i try to make progress indication with UIProgressView so that the user know what's going on, however, when i run, i don't see the progress on the UIProgressView. here is my relevant code :

- (void)viewDidLoad {
    [super viewDidLoad];
    //start request
    NSURL *url=[NSURL URLWithString:@"http://iphone01.mtdgroup/admin_V01/stationsProcessing/pickers_management.php"];
    ASIFormDataRequest *request=[ASIFormDataReques开发者_StackOverflowt requestWithURL:url];
    [request setDelegate:self];
    [request setUploadProgressDelegate:loadingProgress];
    [request startAsynchronous];
    NSLog(@"value: %f",[loadingProgress progress]);
}

the log shows : value: 0.000000. According to the ASIHTTPRequest documentation, setting the UIProgressView as the delegate of the uploadProgressDelegate is sufficient and ASIHTTPRequest will take care of updating the UIProgressView for me. am i missing something ? thx for advance :)

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You're doing an Asynchronous request so the NSLog executes immediately after the request is started at which point the progress would actually be zero - startAsynchronous actually uses an NSOperationQueue behind the scenes so you'll need to code your own delegate if you want to NSLog the progress:

just include something like this in your view controller:

- (void)setProgress:(float)newProgress {
   [loadingProgress setProgress:newProgress];
   NSLog(@"value: %f",[loadingProgress progress]);
}

and set:

[request setUploadProgressDelegate:self];

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Make sure your class also conforms to the ASIProgressDelegate protocol.

@interface YourClass : ... <ASIHTTPRequestDelegate,ASIProgressDelegate>