Adds an action to perform when the specified preference key’s value changes.
SDKs
- iOS 13.0+
- macOS 10.15+
- Mac Catalyst 13.0+
- tvOS 13.0+
- watchOS 6.0+
- Xcode 11.0+
Framework
- Swift
UI
Declaration
func onPreferenceChange<K>(_ key: K.Type = K.self, perform action: @escaping (K.Value) -> Void) -> some View where K : PreferenceParameters
keyThe key to monitor for value changes.
actionThe action to perform when the value for
keychanges. Theactionclosure passes the new value as its parameter.
Return Value
A view that triggers action when the value for key changes.