objective c - IOS Apple Watch voice input -

i plan develop application apple watch. need implement text input voice. on official website found following method:

- (void)presenttextinputcontrollerwithsuggestions:(nsarray *)suggestions                              allowedinputmode:(wktextinputmode)inputmode                                    completion:(void (^)(nsarray *results))completion 

interested in following:

1. what languages supported input?
2. is possible set desired language programmatically?
3. can programmatically selected language?

the input language presenttextinputcontrollerwithsuggestions depends on selected language of selected keyboard on iphone.