您可能已经找到了答案（或放弃了）但在搜索时同样的事情（如果有任何方法来创建自定义国际键盘）我发现这些链接说：

You've probably already found your answer (or given up) but while searching for the same thing (if there were any way to create a custom international keyboard) I found these links which say:

1）你不能创建自己的键盘但只能启用Apple创建的键盘。

2）如果你创建一个应用程序来启用其他键盘，它可能会被拒绝。

1) You can't create your own keyboards but only enable keyboards created by Apple.
2) If you create an app to enable other keyboards it will probably get rejected.

• 为iPhone创建自定义国际键盘
  


• 制作表情符号Enabeling应用程序

• Create custom international keyboard for iPhone
  
• Making An Emoji Enabeling App