I've reviewed the custom styles available in the GoogleCast v3 SDK and unless I'm missing something I don't see a way to change the backgroundColor of the deviceChooser. See below:

Is there any way to change this gray color?
As per the documentation Google does not allow us to change the navigation bar style. So we might need to change the navigation bar appearance before pushing to the media control UI of SDK.
I tried it in didFinishLaunchingWithOptions
[UINavigationBar appearance].barTintColor = [UIColor whiteColor];
[UINavigationBar appearance].translucent = NO;
Hope it helps :)

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