gistfile1.m

@implementation MyAppDelegate

static NSOperationQueue *sharedOperationQueue = nil;

- (void)applicationDidFinishLaunching:(UIApplication *)application {
	
    //setup the operation queue
    sharedOperationQueue = [[NSOperationQueue alloc] init];
    
    //limit the number of concurrent operations to 1, as performance suffers on the iPhone otherwise
    [sharedOperationQueue setMaxConcurrentOperationCount:1];
	
    //Configure ObjectiveResource
    [ObjectiveResourceConfig setSite:@"http://localhost:3000/"];
    // use json
    [ObjectiveResourceConfig setResponseType:JSONResponse];

    // Configure and show the window
    [window addSubview:[navigationController view]];
    [window makeKeyAndVisible];
}


// put job in operation queue and run it when able
+ (void) runJob:(SEL)selector onTarget:(id)target withArgument:(id)argument {
    NSInvocationOperation *operation = [[[NSInvocationOperation alloc] initWithTarget:target 
                                                                             selector:selector 
                                                                               object:argument] autorelease];
    [sharedOperationQueue addOperation:operation];
}

@end

@implementation MyViewController

- (void) loadPeople {
    self.people = [Person findAllRemote];
    [tableView performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:NO];
}

-(IBAction) refreshButtonWasPressed {
    //when the refresh button is pressed, call loadPeople as a new operation
    [MyAppDelegate runJob:@selector(loadPeople) onTarget:self withArgument:nil];
}

@end