Best practices
Use a segmented control to provide closely related choices that affect an object, state, or view.
Consider a segmented control when it’s important to group functions together, or to clearly show their selection state.
Keep control types consistent within a single segmented control.
Limit the number of segments in a control.
In general, keep segment size consistent.
Content
Prefer using either text or images — not a mix of both — in a single segmented control.
As much as possible, use content with a similar size in each segment.
Use nouns or noun phrases for segment labels.
Platform considerations
iOS, iPadOS
Consider a segmented control to switch between closely related subviews.
macOS
Consider using introductory text to clarify the purpose of a segmented control.
Use a tab view in the main window area — instead of a segmented control — for view switching.
Consider supporting spring loading.
tvOS
Consider using a split view instead of a segmented control on screens that perform content filtering.
Avoid putting other focusable elements close to segmented controls.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/segmented-controls