iOS: Determine if device language is Right to Left (RTL)

Question

Is there a way to easily determine if the language the device is set to is right to left (RTL)?

Answer 1

There is an official way to do it:

if ([UIApplication sharedApplication].userInterfaceLayoutDirection == UIUserInterfaceLayoutDirectionRightToLeft) {
}

I would recommend against using some of the other solutions, because they will not always return the correct locale. Just because it's on the top of preferred languages doesn't mean that the application supports it.

Source: https://developer.apple.com/library/content/documentation/MacOSX/Conceptual/BPInternational/SupportingRight-To-LeftLanguages/SupportingRight-To-LeftLanguages.html