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Editorial Team
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Asked: 2026-06-04T01:56:59+00:00

I know that in AppDelegate.m , you must set the root controller for the

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I know that in AppDelegate.m, you must set the root controller for the application. Otherwise you will see nothing in your App and receive a warning.

I found that some materials use:

[window addSubview:anyViewController.view];

or use:

window.rootViewController = anyViewController;

Both methods could make the App start correctly. I can’t understand why the first method doesn’t set the rootviewController for the user, but it still works well. Why is this? What is the difference between them?

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1 Answer

  1. Editorial Team

    rootViewController was added with iOS4 and is the newer and recommended method.

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