Apple's UISwitch support a checkbox style for Mac Catalyst apps as of Big Sur.
Titanium's Ti.UI.Switch currently supports an Android-only style property which can be assigned the following constants...
We should move those constants to the Ti.UI module and add support for iOS builds. The TOGGLEBUTTON constant is Android-only and iOS should default to the SWITCH style instead.
iOS (ie: iPhone/iPad) does not support the checkbox style. This is only support by macOS apps. So, iOS app should use the switch style when assigned a checkbox style.