Question

I have to classes A and B . My B class having the method for connection with the server. I am calling this method from class A.I have implemented the delegate for NSURLConnection.class A having check connectivity function which is having the return type as a BOOL . I am invoking the ping method of class B from this method as follow:
class A:

-(BOOL)checkConnectivity:(Server *)newServer
{
    [b ping];
    return FALSE;
}

class B:

-(void)ping
{


    NSURL *url=[[NSURL alloc]initWithString:@"my url"];
    request=[NSMutableURLRequest requestWithURL:url];
    connection=[[NSURLConnection alloc]initWithRequest:request delegate:self];

    if(connection)
    {
        webData=[NSMutableData data];
    }
}


-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *) data
{
    [webData appendData:data];
}


-(void) connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"Finished loading");   
}

there is no issue with the url. Then whats wrong?why delegate methods are not invoking ?

Answer 1

Check u have added this:

@interface yourViewController : UIViewController <NSURLConnectionDelegate>

Now do this in your ping method:

 NSURLConnection * connection = [[NSURLConnection alloc] 
                            initWithRequest:request
                                   delegate:self startImmediately:NO];

[connection scheduleInRunLoop:[NSRunLoop mainRunLoop] 
                  forMode:NSDefaultRunLoopMode];
 [connection start]