# updateViewConstraints() Called during Auto Layout constraint updating to enable the view controller to mediate the process. ``` func updateViewConstraints() ``` ## Discussion This method gets called, for example, when the user interacts with a view in a way that causes the layout to change. When called, the default implementation of this method in turn calls the [`updateConstraints()`](/documentation/AppKit/NSView/updateConstraints()) method on the view controller’s view. You can override this method to update custom view constraints, as an alternative to subclassing the view controller’s view and overriding its [`updateConstraints()`](/documentation/AppKit/NSView/updateConstraints()) method. If you override this method, you must call this method on `super` at some point in your implementation or call the [`updateConstraints()`](/documentation/AppKit/NSView/updateConstraints()) method on the view controller’s view. This method is called only for apps that link against macOS 10.10 or later. This method supports automatic observation tracking. For more information, see [Updating views automatically with observation tracking in AppKit](/documentation/AppKit/updating-views-automatically-with-observation-tracking-in-appkit). --- 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)