willTransition(to:)
Tells the view controller that the extension is about to transition to a new presentation style.
Declaration
func willTransition(to presentationStyle: MSMessagesAppPresentationStyle)Parameters
- presentationStyle:
The new presentation style. For a list of possible styles, see Msmessagesapppresentationstyle.
Discussion
Override this method to update your extension’s layout while the extension is transitioning between the MSMessagesAppPresentationStyle.compact and MSMessagesAppPresentationStyle.expanded styles. The user can switch between styles by tapping the collapse and expand buttons in the Messages app. You can also programmatically trigger a transition by calling requestPresentationStyle(_:).
The system doesn’t call this method on a view controller that is presenting a live view in the transcript or input field—in other words, when the view controller’s presentationStyle property is set to the MSMessagesAppPresentationStyle.transcript value.