How to detect when your size class changes
Swift version: 5.0
All view controllers have a size class, which is a vague description of how much space is available both horizontally and vertically. These sometimes change when the user rotates their device, but can also change on iPad when they split the screen between two apps in various ways.
If your app needs to respond to size class changes, it’s important you implement the traitCollectionDidChange method. There you can check the size class of the current trait collection and respond appropriately. For example:
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
if traitCollection.horizontalSizeClass == .compact {
// load slim view
} else {
// load wide view
}
}SPONSOR Tired of wasting time debugging your Swift app? Instabug’s SDK is here to help you minimize your debugging time by providing you with complete device details, network logs, and reproduction steps with every bug report. All data is attached automatically. It only takes a line of code to setup. Get started for free.
Available from iOS 8.0
Did this solution work for you? Please pass it on!
Other people are reading…
- How to center a view in its container
- How to animate when your size class changes: willTransition(to:)
- How to ask users to review your app using SKStoreReviewController
- How to add a shadow to a UIView
- How to add scopes to a UISearchController
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
