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Articles, snippets and thoughts about code from Andrew Lord.

Constraints for a child view controller within a subview

Published on · Updated on
1 minute read

When a child UIViewController is added within one of it's parent's subviews, there can be an issue where it doesn't expand to fill it. This can often happen when we only tested on a specific device size.

The fix involves preventing the auto-resizing mask from being turned into constraints and ensuring the child view controller's anchor constraints are all attached to the edge's of its container view.

child.view.translatesAutoresizingMaskIntoConstraints = false
child.view.attachAnchors(to: containerView)
child.didMove(toParent: self)

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Hi, I hope you enjoyed the article. I am Andrew - a builder of apps and developer tools. Articles on the blog focus on all aspects of Android and iOS development using Kotlin and Swift.

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