Does UIActivityIndicator require manual threading on iPhone

- (IBAction)syncOnThreadAction:(id)sender
{
    [self willStartJob];

    id myObject = [MyObjectClass createNewObject];
    [self performSelectorInBackground:
        @selector(inThreadStartDoJob:)
        withObject:myObject
    ];
}

- (void)inThreadStartDoJob:(id)theJobToDo
{
    NSAutoreleasePool * pool;
    NSString *          status;

    pool = [[NSAutoreleasePool alloc] init];
    assert(pool != nil);

    status = [theJobToDo countGrainsOfSandOnBeach];

    [self performSelectorOnMainThread:
        @selector(didStopJobWithStatus:)
        withObject:status
        waitUntilDone:NO
    ];

    [pool drain];
}

-(void)submit_Clicked:(id)event
{
    [self.spinner startAnimating];
    [self performSelector:@selector(displayComposerSheet)
               withObject:nil afterDelay:0];
}

1> Have 1 method that starts the spinner (in the background).
2> Run your long-running code right here.
3> Have 1 method that ends the spinner.

A> Have 1 method that starts the spinner.
B> Have 20 methods (1 for each thing you want to do in the background)
C> Have 1 method that ends the spinner.