self.window.rootViewController vs window addSubview

Question

I\'ve noticed a lot of examples for iPhone apps in the Application Delegate

- (void)applicationDidFinishLaunching:(UIApplication *)application

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Answer 1

I use this code:

    rootViewController_ = [[RootViewController alloc] initWithFrame:[UIScreen mainScreen].bounds];
    window_ = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    if ([window_ respondsToSelector:@selector(setRootViewController:)]) { // >= ios4.0
        [window_ setRootViewController:rootViewController_];
    } else { // < ios4.0
        [window_ addSubview:rootViewController_.view];
    }