Question

I’m a beginner with Xcode and Objective-C, i want to make a view controller in code without a nib file and shape it how i want. Currently with this very simple code I can’t seem to even change the background color because of EXC_BAD_ACCESS.

I read on internet it is something with memory management but I can’t seem to find the fix for this. Pieces of my code:

AppDelegate.h

#import <UIKit/UIKit.h>
#import "DefaultViewController.h"

@class DefaultViewController;

@interface AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    UIViewController *rootViewController;
}

@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet UIViewController *rootViewController;

@end

AppDelegate.m

@synthesize window = _window;
@synthesize rootViewController = _rootViewController;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    UIViewController *rvc = [[DefaultViewController alloc] init];
    self.rootViewController = rvc;
    [rvc release];

    [self.window addSubview:self.rootViewController.view];

    // Override point for customization after application launch.
    [self.window makeKeyAndVisible];
    return YES;
}

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

The view controller I made via, right click -> new file and UIViewController subclass without xib! In the loadView I only try this:

self.view.backgroundColor = [UIColor redColor];

Answer 1

The problem could be that the rootViewController doesn’t have an initialized view. Hard to tell, since you don’t show the code of the DefaultViewController. It could also be another error in DefaultViewController.

---

FWIW, you have two obsolete ivars:

@interface AppDelegate : NSObject <UIApplicationDelegate> {
    UIWindow *window;
    UIViewController *rootViewController;
}

You can delete these, since you synthesize _window and _rootViewController and never use the above.