Recursive calls to viewDidLoad, crashing - ios

Question

in loggerViewController.m:
- (void)viewDidLoad
{
[super viewDidLoad];
UIView* mainView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
[self.view addSubview:mainView]; // <-- Problem is here
}
loggingViewController is an iVar of my appDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
.
.
loggingViewController = [[loggerViewController alloc] init];
[loggingViewController.view setBackgroundColor:[UIColor blueColor]];
// [loggingViewController loadView];
[self.view addSubview:loggingViewController.view];
}
I was expecting my AppDelegate to call loggingViewController, which in turn, set up it's own subviews inside and it would be done. But instead the viewDidLoad gets called recursively I don't understand why?

Answer 1

Try it like this,
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
loggingViewController = [[loggerViewController alloc] init];
self.window.rootViewController = loggingViewController;
[self.window makeKeyAndVisible];
}
The reason for recursive calling is that your self.view is nil and hence it is try to call again and again when you are trying to add it as a subview of appdelegate's view.
- (void)viewDidLoad
{
[super viewDidLoad];
UIView* mainView = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds];
[self.view setBackgroundColor:[UIColor blueColor]];
[self.view addSubview:mainView];
}