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Home/ Questions/Q 5957941
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Editorial Team
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Editorial Team
Asked: May 22, 20262026-05-22T18:28:21+00:00 2026-05-22T18:28:21+00:00

What is the difference between these two methods when adding a root controller: self.window.rootViewController

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What is the difference between these two methods when adding a root controller:

self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];

And:

[self.window addSubview:rootController.view];
[self.window makeKeyAndVisible];    

Cheers,
Peter

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  1. Editorial Team
    Editorial Team
    2026-05-22T18:28:22+00:00Added an answer on May 22, 2026 at 6:28 pm

    After reading the documentation it seems that the rootViewController property is as of iOS SDK 4.0 and addSubview has been since iOS SDK 2.0.

    I’ve tried using them both and they seem to do exactly the same thing. So I suppose if you want to support iDevices < 4.0 you should use the [self.window addSubview:controller.view] method.

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