並前往https://www.quora.com/Does-usability-suffer-if-you-dont-follow-the-iOS-human-interface-guidelines-Considering-the-Facebook-app-as-an-example-the-navigation-bar-should-avoid-crowding-a-navigation-bar-with-additional-controls-even-if-there-appears-to-be-enough-space-%E2%80%9D