UIActivityIndicator does not animate - objective-c

Question

- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.connectionIndicator = [[[UIActivityIndicatorView alloc]
initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray] autorelease];
[self.view addSubview:connectionIndicator];
[self.connectionIndicator setCenter:CGPointMake(self.view.frame.size.width/2, 15)];
[connectionIndicator startAnimating];
}
The spinner shows up frozen, and does not start animating.
Edit: Okay I figured out the cause but yet to find a solution.
This view controller is pushed into navigation controller stack through a page curl-up transition:
ServerHandshakeViewController *shvc = [[ServerHandshakeViewController alloc] initWithHost:h];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
[self.navigationController pushViewController:shvc animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.navigationController.view cache:NO];
[UIView commitAnimations];
[shvc release];
Removing the above curl-up transition like below solves the spinner freeze problem.
ServerHandshakeViewController *shvc = [[ServerHandshakeViewController alloc] initWithHost:h];
[self.navigationController pushViewController:shvc animated:NO];
[shvc release];
But then, what if I want to retain my curl-up page transition?

Answer 1

You could try using the block method where you can specify animation options. UIViewAnimationOptionAllowAnimatedContent is the option which should free up the spinner.
[UIView transitionWithView:self.navigationController.view
duration:1.0
options:UIViewAnimationOptionAllowAnimatedContent | UIViewAnimationTransitionCurlUp | UIViewAnimationOptionCurveEaseInOut
animations:^{[self.navigationController pushViewController:shvc animated:NO];}
completion:nil];