I assume that you are using the custom GPPSigninButton class that Google provides.
In this sample project , it looks like the text βInputβ is part of the image, so unfortunately you cannot change this text. You will need to create a button and handle the login event yourself using IBAction .

I created my own sample application using the latest version of the SDK. Looking at the button through the View Debugger, it has a label, but it does not appear in the header file.
// // GPPSignInButton.h // Google+ iOS SDK // // Copyright 2012 Google Inc. // // Use of this SDK is subject to the Google+ Platform Terms of Service: // https://developers.google.com/+/terms //

Unfortunately, this means that you cannot change this text.
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