Best practices
Use a disclosure control to hide details until they’re relevant.
Disclosure triangles
- Collapsed
- Expanded
Provide a descriptive label when using a disclosure triangle.
Disclosure buttons
- Collapsed
- Expanded
Place a disclosure button near the content that it shows and hides.
Use no more than one disclosure button in a single view.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/disclosure-controls