Question

I’m currently having an issue with UIViewController‘s presentModalViewController:animated:.

I use the following code to set up and show the modal view controller:

UINavigationController *navigationController = [[UINavigationController alloc] init];
AddSerialController *serialController = [[AddSerialController alloc] initWithNibName:@"AddSerial" bundle:nil];
[navigationController pushViewController:serialController animated:NO];

[self.parentViewController presentModalViewController:navigationController animated:YES];

[serialController release];
[navigationController release];

The Application (running in iPhone Simulator) crashes as soon as dismissModalViewControllerAnimated: is called. GDB says it crashes at objc_msgSend.

If I comment out the last line of code (release of the navigation controller) everything works but I’m leaking a UINavigationController (as expected).

What the hell is going on here?

Answer 1

When you create a UINavigationController, you should give it a root view controller:

AddSerialController *serialController = [[AddSerialController alloc] initWithNibName:@"AddSerial" bundle:nil];

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:serialController];

[serialController release];

[self.parentViewController presentModalViewController:navigationController animated:YES];

[navigationController release];