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# UISceneSizeRestrictions

An object that specifies the minimum and maximum sizes for resizable windows.

```
@MainActor class UISceneSizeRestrictions
```

## Overview

Don’t create a [`UISceneSizeRestrictions`](/documentation/UIKit/UISceneSizeRestrictions) object yourself. Instead, fetch an existing one from the [`sizeRestrictions`](/documentation/UIKit/UIWindowScene/sizeRestrictions) property of your window scene, and modify its properties to set the minimum and maximum window sizes:

```objc
@interface SceneDelegate ()

@end

@implementation SceneDelegate

- (void)scene:(UIScene *)scene
willConnectToSession:(UISceneSession *)session
      options:(UISceneConnectionOptions *)connectionOptions {

    UIWindowScene *windowScene = (UIWindowScene *)scene;
    if (![windowScene isKindOfClass:[UIWindowScene class]]) { return; }

    CGSize minimumSize = windowScene.sizeRestrictions.minimumSize;
    minimumSize.width = 500.0;
    windowScene.sizeRestrictions.minimumSize = minimumSize;
}

@end
```

The system provides this object only when it supports variable-sized windows.

## Topics

### Setting the size restrictions

[`minimumSize`](/documentation/UIKit/UISceneSizeRestrictions/minimumSize)

The minimum width and height supported by your app’s windows.

[`maximumSize`](/documentation/UIKit/UISceneSizeRestrictions/maximumSize)

The maximum width and height supported by your app’s windows.

[`allowsFullScreen`](/documentation/UIKit/UISceneSizeRestrictions/allowsFullScreen)

A Boolean value that indicates whether the scene can appear full screen.


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