问题
Does MFMailComposeViewController come only in English!?
I am toying around with the idea of using MFMailComposeViewController to handle sending email from my app but I need it to conform to the language environments of devices set to languages other than english. Is it possible to set MFMailComposeViewController to other languages? Even if I set my device's language to, say, japanese, the MFMailComposeViewController's To:, From:, Subject:, portions remain in english. How does one change the language of MFMailComposeViewController?
回答1:
MFMailComposeViewController will display in the language the application is translated into rather than the language the user has selected; this keeps the text within the application consistent. Add a language project for the language you are targeting and the composer view will adopt that language.
The Done button on the keyboard, the Delete button that shows when a UITableViewCell is swiped and other built-in views behave similarly.
来源：https://stackoverflow.com/questions/1321281/mfmailcomposeviewcontroller-in-other-languages