iPhone delegate & controller dealloc?

Question

I have been playing with a simple iphone app and decided to put an NSLog statement in the deallocs of both the controller and the delegate but neither of these print out to the Xcode console?

// APPLICATION DELEGATE

#import "iPhone_buttonFunAppDelegate.h"
#import "iPhone_buttonFunViewController.h"

@implementation iPhone_buttonFunAppDelegate

@synthesize window;
@synthesize viewController;

- (void)applicationDidFinishLaunching:(UIApplication *)application {       
    // Override point for customization after app launch
    NSLog(@"applicationDidFinishLaunching ...");
    [window addSubview:viewController.view];
    [window makeKeyAndVisible];
}

- (void)applicationWillTerminate:(UIApplication *)application {
    NSLog(@"AWT:");
}

- (void)dealloc {
    NSLog(@"-DEL-"); // << Does not print?
    [viewController release];
    [window release];
    [super dealloc];
}
@end

// VIEW CONTROLLER

#import "iPhone_buttonFunViewController.h"

@implementation iPhone_buttonFunViewController
@synthesize statusText;

-(IBAction)buttonPressed:(id) sender {
    NSString *title;
    NSString *newText;

    title = [sender titleForState:UIControlStateNormal];
    newText = [[NSString alloc] initWithFormat:@"%@ button pressed.", title];
    [statusText setText:newText];
    [newText release];
    NSLog(@"Button Press ... %@", title);
}

-(void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
    NSLog(@"-1-");
}

-(void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
    NSLog(@"-2-");
    self.statusText = nil;
}

-(void)dealloc {
    NSLog(@"-CON-"); // << Does not print?
    [statusText release];
    [super dealloc];
}
@end

gary

Answer 1

This is an optimization in the Cocoa touch runtime. Certain deallocations aren't made at the end of the program, since the entire program is going to exit and they will be wiped out anyway.