我认为问题在于，在某些语言中，这些单词的大小只能适合按钮.这也与文化背景有关.虽然作为母语的德国人，我不明白为什么他们不使用"An/Aus"，但I/O可能具有更强大的符号.

I think the problem is that in some languages these words are just to big to fit into the button. This has also to do with cultural background. While, as native german, I can't understand why they didn't use "An/Aus", I/O may have stronger symbolics.

最后，这不必让您担心.这些事情在整个iOS上都是一致的.如果外观不同，用户可能会感到困惑...

In the end, this shouldn't worry you. These things are consistent all over iOS. User might be confused if it looked different...