How to change Facebook iOS SDK's done button color when login? : <p><a href="https://i.stack.imgur.com/Bunc3.png" rel="noreferrer"><img src="https://i.stack.imgur.com/Bunc3.png" alt="enter image description here"></a></p>

<p>My app use white UITabBarItem text color and orange UINavigationBar BarTintColor, when click the Login button added from Facebook SDK, it will popup a webview for login.</p>

<p>but the topbar background color always light gray, if I change the UITabBarItem color, other view will all changed, How can I only custom the button color in Facebook login view or change the navbar background color?</p>
