How to change rootViewController's view? - objective-c

Question

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil] autorelease];
} else {
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil] autorelease];
}
CustomView1 *CustomView = [[CustomView1 alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController.view = CustomView;
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
This appears in AppDelegate.m
I want to change rootViewcontroller's view to CustomView, and tried the code above, but the background color remained black and touch event weren't accepted.
Where is the error?

Answer 1

I am not sure where the fault is but I have 2 suggestions.
1) Change
CustomView1 *CustomView = [[CustomView1 alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
self.viewController.view = CustomView;
to
CustomView1 *CustomView = [[CustomView1 alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
[self.viewController.view addSubview:CustomView];
or
2) In both you .xib files referenced go to the top view and change it to use a custom class. Then you can just let the app launch like normal
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
// Override point for customization after application launch.
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController_iPhone" bundle:nil] autorelease];
} else {
self.viewController = [[[ViewController alloc] initWithNibName:#"ViewController_iPad" bundle:nil] autorelease];
}
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
return YES;
}
Side note:
You should avoid naming variables that begin with uppercase letters. Many coding standards have classes begin with uppercase letters and variables begin with lower case letters.

Answer 2

If you need two different view controllers to manage one view class, you should make the view controllers load the right view class in their loadView method or in their nib file. I guess the controllers in your code use nibs. If so, edit the nibs to set the view class to CustomView1.
CustomView1 is an unfortunate choice of class name, IMHO, because it doesn't mean anything.