How Can I Define a Custom Color That Is Available Both Programmatically And In IB?

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I want to be able to define a custom color in a single place and then have access to it both programmatically and in Interface Builder. For coding I could create a UIColor extension. For visual designing in IB I could create a custom color palette. What is the best technique that will simultaneously work with both?

Unfortunately you can't do this.

You can define a colour that you can access in code through an extension of UIColor. Or you can add a colour to the pallets in Interfact Builder.

But you can't have both.

Hmm...

What you could do is something similar to what PaintCode does.

Create an object in code that has a IBOutletCollection and then when the view loads it will iterate the outlets and set the background colour etc... to your fancy colour.

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Xcode 9 allows you to place colors in the Asset catalog. This is Apple's answer to those who want to have their colors synced across both.

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It's now possible.

Creating color sets with color names, and you can access them by color name in your code as well as interface builder.

Reference: https://medium.com/bobo-shone/how-to-use-named-color-in-xcode-9-d7149d270a16

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If you have a color thats variable, you can also make a subclass of UIView:

class color01_view:UIView {
let color01:UIColor = UIColor(red: 250.0/255.0, green: 250.0/255.0, blue: 250.0/255.0, alpha: 1)

required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.backgroundColor = color01

    }

    override init(frame: CGRect) {
        super.init(frame: frame)
    }

}

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Comments
  • Oh nice! I didn't know that. Looks like there's a lot of awesome goodies in Xcode 9!
  • Sounds great. One would assume that in all the places where IB provides a means to set a color IB will offer the asset catalog as a color source?