Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Build a Playlist Browser with Swift Building the Music Library and Playlist Models Using a Playlist Instance

getting "extra argument 'green' in call error. I don't have an extra argument so why am I getting this?

func rgbColorFromDictionary(colorDictionary: [String: Float]) -> UIColor {

        let red = colorDictionary["red"]!
        let green = colorDictionary["green"]!
        let blue = colorDictionary["blue"]!
        let alpha = colorDictionary["alpha!"]!

        return UIColor(red: red/255.0, green: green/255.0, blue: blue/255.0, alpha: alpha)


1 Answer

Nick Kohrn
Nick Kohrn
36,935 Points

Hi Bryan,

The issue is that in your function declaration, you are setting the dictionary to have a String key and a Float value. The UIColor method takes CGFloat values rather than Float values. If you change your Float to CGFloat, then it should get rid of that error for you.

Also, you have an extra bang(!) in your alpha variable. That will more than likely cause another error. Getting rid of that should clear things up for you!