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# screen

The screen to display the window on.

```
var screen: UIScreen { get set }
```

## Discussion

By default, UIKit sets this property to the primary device screen. If additional screens are attached to the device, you can assign a different screen object to display the window on that screen. A window is always displayed on only one screen.

Moving windows from screen to screen is a relatively expensive operation and isn’t optimal in performance-sensitive code. Instead, change the screen before displaying the window the first time. Changing the screen of a window that hasn’t been ordered onto the screen has no significant additional cost.

---

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