Anatomy
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A slider provides a range of values to choose from, such as how much contrast to apply to the content.
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A picker offers discrete options, such as turning a grid on and off in the viewfinder.
Best practices
Use SF Symbols to represent control functionality.
Keep names of controls short.
Include units or symbols with slider control values to provide context.
Define prominent values for a slider control.
Make space for the overlay in the viewfinder.
Minimize distractions in the viewfinder.
Enable or disable controls depending on the camera mode.
Consider how to arrange your controls.
Allow people to use the Camera Control to launch your experience from anywhere.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/camera-control