ios soft keyboard

If you are using StageText class for text input fields, you can set the returnKeyLabel property of StageText to next

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var st:StageText = new StageText();
st.stage = stage;
st.viewPort = new Rectangle(x, y, width, height);
st.returnKeyLabel = ReturnKeyLabel.NEXT;
st.addEventListener(KeyboardEvent.KEY_DOWN, keyDownEventHandler);

private function keyDownEventHandler(event:KeyboardEvent):void
{
     // logic for moving focus to next text input field  


}

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Hope it helps!!