Would it be OK to add a custom button on a system keyboard in iPad

I have a requirement wherein I have to change the text of the return key of the iPad to Sign-in. Obviously it is not one of the options available in the sdk. I have searched it over the net and it seems doing that possible.

The only question remaining i开发者_如何学Gos whether the app would be accepted by Apple if I modify the default system keyboard? The HIG is not clear on this , it states that "A custom input view can replace the system-provided onscreen keyboard in apps" and "You can also provide a custom input accessory view, which is a separate view that appears above the keyboard (or your custom input view)". Nothing about whether we are allowed to add an extra button on a system keyboard.

Any experiences??

@Vin you can change the name of return key of the keyboard to your requirement. I have an app that has the changed to return key name to Done and Search. And apple did not reject it.

To "Sign-In" you can use the return key UIReturnKeyJoin

textField.returnKeyType = UIReturnKeyJoin;

EDIT

Nope. You get the return key and keyboard types defined in the OS. Unless you want to try to hack the keyboard's view hierarchy to change that button, which would be a really bad plan. (Standard recommendation here is to file a bug report with Apple to let them know you'd like more/different options.)

see Custom iPhone return key text

Since I didn't get any satisfactory answer, I convinced the client that it would be inappropriate to modify the default system keyboard for a sake of one button(even if it is allowed by Apple). We are now going for the "Go" option available for return key.