Question

I’m new to iPhone development and am having problems removing a sub-view from the main window. The problem is that the view still shows up even after calling removeFromSuperview.

The sub-view is created and added to the display tree through this code:

// Instantiate the controller for the authentication view
AuthenticationController* controller = [AuthenticationController alloc];
[controller initWithNibName:@"AuthenticationView" bundle:[NSBundle mainBundle]];
authController = controller;

// Add the authentication view to the window
[[stateManager appWindow] addSubview:[authController view]];

Then later, and I have verified that this code is run by setting a breakpoint, this is how I’m attempting to remove the view:

[[authController view] removeFromSuperview];

In case it matters, here’s the dealloc code that does the for the owner of the view controller:

- (void)dealloc {
    [authController release];
    [super dealloc];
}

What is causing this sub-view to continue to show up?

Answer 1

I got this working. Apparently, a view doesn’t go away until it’s deallocated, and I had a misunderstanding of how memory management works on this platform. Here’s my corrected code:

AuthenticationController* controller = [[AuthenticationController alloc]
initWithNibName:@"AuthenticationView" bundle:[NSBundle mainBundle]];
controller.delegate = self;
authController = controller;
[controller release]; // <-- Problem was that a reference was being maintained
[[stateManager appWindow] addSubview:[authController view]];