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Editorial Team
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Asked: 2026-05-23T12:33:33+00:00

What I am trying to learn is what is the difference between the window,

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What I am trying to learn is what is the difference between the window, and viewcontroller. I know that you can only have one window per application. But you can have multiple viewcontrollers. When I create a project thats based off of the window-based application template I get only a window. I can create my own viewcontrollers, but I also know that I can put things directly onto the window in a window-based application (I think correct me if I am wrong). But with a view-based application I of course get a view that I can add things to. Can anyone clarify any of this for me if I make any sense?

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1 Answer

  1. Editorial Team

    Basically you have one instance of UIWindow that’s hosting all your UIViewControllers and UIViews as part of the view hierarchy. That’s why UIApplication has a call [UIApplication sharedApplication].keyWindow, to access the “root” view.

    So for example you can have the following stack:

    [UIApplication sharedApplication].keyWindow ->
    MyView ->
    MyOtherViewController

    For more information, read up the Developer Documentation on UIWindow and UIViewController which provide a great explanation on the differences.

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