xcode syntax color coding explained?

Can anyone give me a quick rundown of the color syntax meanings in xcode?

I am running into some problems and understanding the color coding I am sure will help me out. Currently I have some variables that are light blue and I think they need to be black but I am not sure of the difference?

masterViewController=[[UINavigationController alloc] initWithDestination: destination];

I believe my masterViewController here should be colored black and not the lig开发者_开发技巧ht blue it is currently colored - I am assuming I defined or initialized something wrong somewhere.

First day in xCode so I am pretty damn confused!

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Go to: Xcode => Preferences => Fonts & Colors

You'll see that each syntax highlighting colour has a brief explanation next to it.

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In XCode 12.3 the heading is Themes rather than Fonts & Colours

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As @Paul said, it's self-explaining in the Fonts & Colors