# clearsContextBeforeDrawing A Boolean value that determines whether the view’s bounds should be automatically cleared before drawing. ``` var clearsContextBeforeDrawing: Bool { get set } ``` ## Discussion When set to , the drawing buffer is automatically cleared to transparent black before the [`draw(_:)`](/documentation/UIKit/UIView/draw(_:)) method is called. This behavior ensures that there are no visual artifacts left over when the view’s contents are redrawn. If the view’s [`isOpaque`](/documentation/UIKit/UIView/isOpaque) property is also set to , the [`backgroundColor`](/documentation/UIKit/UIView/backgroundColor) property of the view must not be `nil` or drawing errors may occur. The default value of this property is . If you set the value of this property to , you are responsible for ensuring the contents of the view are drawn properly in your [`draw(_:)`](/documentation/UIKit/UIView/draw(_:)) method. If your drawing code is already heavily optimized, setting this property is can improve performance, especially during scrolling when only a portion of the view might need to be redrawn. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)