material-components_material-components-ios/components/Buttons/docs/customizing-elevation.md

Customizing elevation

The elevation of a button can be changed for a given control state using setElevation:forState:.

See the Material Design shadow guidelines for a detailed overview of different shadow elevations.

For example, to make a button elevate on tap like a floating action button:

Swift

button.setElevation(6, for: .normal)
button.setElevation(12, for: .highlighted)

Objective-C

[button setElevation:6.0f forState:UIControlStateNormal];
[button setElevation:12.0f forState:UIControlStateNormal];