Taken from TiSlack:
Seems like iOS 14 doesn’t like the dateTimeColor property (causes crash when using a picker with type Ti.UI.PICKER_TYPE_DATE). — Is there any alternative way to change a picker’s text color?
Crash Error (simulator & device)
The reason is that Titanium uses non-offical API's for this (reflection), which is generally okay but error prone for new releases. This year, Apple changed the UIDatePicker styles a lot, causing the initial implementation to break. The fix is to guard iOS 14 as well as the used datePickerStyle (which I added for 9.2.0).
PR to fix this: https://github.com/appcelerator/titanium_mobile/pull/12167