useCupertinoCheckmarkStyle property
final
Controls whether the checkmark style is used in an iOS-style radio.
Only usable under the Radio.adaptive constructor. If set to true, on Apple platforms the radio button will appear as an iOS styled checkmark. Controls the CupertinoRadio through CupertinoRadio.useCheckmarkStyle.
Defaults to false.
Implementation
final bool useCupertinoCheckmarkStyle;