Showing Activity Indicator Within UIAlertview in Iphone

ViewController.h
================
@interface ViewController : UIViewController{
    UIAlertView *alertLoader;
}

@end

ViewController.m
================
- (void)viewDidLoad
{
    [super viewDidLoad];  
    [self methodtocallWebservices];
}
-(void)methodtocallWebservices{   
    alertLoader = [[UIAlertView alloc] initWithTitle:@"" message:@"Please Wait..." delegate:self cancelButtonTitle:nil otherButtonTitles:nil];
    alertLoader.tag=1;
    [alertLoader show];   
}
- (void)didPresentAlertView:(UIAlertView *)alertView
{  
    if (alertView.tag== 1) {
        UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];       
        indicator.center = CGPointMake(alertView.bounds.size.width/2, alertView.bounds.size.height/3 * 2);       
        [indicator startAnimating];
        [alertView addSubview:indicator];       
        NSString *hostStr = @"@"http://rajuandroid.blogspot.com/api/contact_name_json";       
        NSURL *url = [[NSURL alloc] initWithString:hostStr];
        NSLog(@"login url:  %@",url);       
        NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
        [[[NSURLConnection alloc] initWithRequest:request delegate:self] autorelease];
        [url release];
    }   
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
  //  [self.receivedData appendData:data];
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    [self stopLoading];
    //[self handleError:error];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    [self stopLoading];  
}
-(void)stopLoading
{
    dispatch_async(dispatch_get_main_queue(), ^{
        [alertLoader dismissWithClickedButtonIndex:0 animated:YES];
        [alertLoader release];
    });
}