title: How to change ios keyboard language
body: <p>How to change ios keyboard language, for example, i have 3 textfields, when textfield1 <code>becomeFirstResponder</code>, i want to use emoji keyboard, when textfield2 <code>becomeFirstResponder</code>, i want to use english keyboard, when textfield3 <code>becomeFirstResponder</code>, i want to use chinese keyboard, is there any way to do it? I had not found some API in Apple Document, could you give me an idea?</p>