Use case

Sheet

The sheet presentation style appears as a card that partially covers the underlying content and dims all uncovered areas to prevent interaction with them. The top edge of the parent view or a previous card is visible behind the current card to help people remember the task they suspended when they opened the card. People dismiss a card by:

• Swiping down from the top of the screen
• Swiping down from anywhere on the screen when card content is scrolled to the top
• Tapping a button
• Use a sheet for nonimmersive modal content that doesn’t enable a complex task.

https://developer.apple.com/design/human-interface-guidelines/ios/app-architecture/modality/#sheet

Proposal

Add sheet to CupertinoPageRoute class.