SwiftUI how to get dynamic color?

Question

I have a config file and I want to change colors there. But in my view function background(bg1Color) gives me error;

Argument type 'UIColor' does not conform to expected type 'View'

How can I fix this?

My config file;

import UIKit
import Foundation

// Backgrounds
var bg1Color: UIColor = .black

My function codes;

.background(bg1Color) // HERE
.cornerRadius(10)

stackoverflow.com/questions/56437036/…

Martin R
– Martin R

2019-12-29 11:00:44 +00:00
Commented Dec 29, 2019 at 11:00 — Martin R
– Martin R, Commented Dec 29, 2019 at 11:00

Mojtaba Hosseini · Accepted Answer · 2020-07-25 19:53:27Z

4

.background modifier takes a View and unlike SwiftUI's Color, UIKit's UIColor is not conformed to View protocol (by default).

So you need to create a Color from your UIColor and then pass it to the .background modifier.

.background(Color(bg1Color))

or directly:

.background(Color(.black))

Very Important Note!

UIColor and Color predefined named colors are not the same! And they have different shades!

So you should NOT just replace UIColor with Color.

_{Actually SwiftIUI.Color.red quals to UIKit.UIClor.systemRed}

edited Jul 25, 2020 at 19:53

answered Dec 29, 2019 at 11:27

Mojtaba Hosseini

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4 Comments

Fogmeister Over a year ago

Wait... what? I never realised the SwiftUI.Color and UIColor did not make the same shades. Is this true if you use RGB initialiser too?

Mojtaba Hosseini Over a year ago

I meant for predefined named colors as I mentioned in the image. If you manually pass the values, they will be the same of course.

Fogmeister Over a year ago

Ah, ok. Haha, that makes more sense. For a second there I thought you meant they were using different colour spaces. 😂

Mojtaba Hosseini Over a year ago

Actually SwiftIUI.Color.red quals to UIKit.UIClor.systemRed

SwiftDeveloper · Accepted Answer · 2019-12-29 11:12:45Z

1

It's Color not UIColor

 import SwiftUI

 var bg1Color : Color = .black

edited Dec 29, 2019 at 11:12

SwiftDeveloper

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answered Dec 29, 2019 at 11:02

Shehata Gamal

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