swiftuicolorasset-catalogios11xcode9-beta

Reputation: 1844

How can we use Assets Catalog Color Sets?

I usually use custom UIColors on iOS using extensions with Swift, but now with iOS 11/ Xcode 9 we can create Colors Sets. How can we use them?

Update - Tip

As @Cœur says we can drag&drop de color, and use it like a UIColor object and a possible solution could be use it as a extension:

Or as a constant:

Now I wanna know if we can access them like an UIImage access to an Asset Image or not, like:

UIImage(named: "image-name") -> UIColor(named: "color-name")

Upvotes: 109

Answers (12)

keyvan yaghoubian

Reputation: 312

For SwiftUI create a class and name it : Color + extension and extend color :

import SwiftUI

extension Color {
    static let background = Color("BackgroundColor")
    static let whiteColor = Color("WhiteColor")
    static let blackColor = Color("BackgroundColor")
    static let primary = Color("PrimaryColor")
    static let secondaryColor = Color("SecondaryColor")    
}

Upvotes: 4

Klucze

Reputation: 49

you can create extension with func for unwrapping colors from assets and use it with every color in your app

extension UIColor {
    static var someColor: UIColor {
        return UIColor.color(name: "SomeColor")
    }

    private static func color(name: String) -> UIColor {
        guard let color = UIColor(named: name) else {
            return .black
        }
        return color
    }
}

usage example:

UIColor.someColor

someLabel.textColor = .someColor

Upvotes: 3

herve

Reputation: 3954

Or, with the SwiftUI Color structure, you can simply call the initializer with the asset name:

Color("background")

Upvotes: 2

Bola Ibrahim

Reputation: 780

You can use this way for simple accessing (swift 4 & swift 5)

enum AssetsColor: String {
    case backgroundGray
    case blue
    case colorAccent
    case colorPrimary
    case darkBlue
    case yellow
}

extension UIColor {
    static func appColor(_ name: AssetsColor) -> UIColor? {
         return UIColor(named: name.rawValue)
    }
}

Using:

userNameTextField.textColor = UIColor.appColor(.blue)

Upvotes: 32

Tolgahan Arıkan

Reputation: 1541

In case you experience a delay with colors loading in a Swift Package when using UIColor(named:):

The answers above are totally valid for a regular project but if you are using assets in a swift package, you can see a delay when loading the colors when you use UIColor(named: "example_name"). If you use UIColor(named: "background", in: Bundle.module, compatibleWith: .current) overload that is targeting the module, the colors load immediately without any delay.

Note: I experienced this on Xcode 12.1.

Upvotes: 3

Muchicole

Reputation: 89

For your question if you can access color assets like the image using literal, as of Xcode 10.2 you can type in colorliteral, then you can pick the color you want to use that is under your asset manager.

Upvotes: 8

Hitesh Agarwal

Reputation: 2005

You need to use UIColor(named: "appBlue").

And you can create a function in UIColor extension for simple access.

enum AssetsColor {
   case yellow
   case black
   case blue
   case gray
   case green
   case lightGray
   case separatorColor
   case red
}

extension UIColor {

    static func appColor(_ name: AssetsColor) -> UIColor? {
        switch name {
        case .yellow:
            return UIColor(named: "appYellow")
        case .black:
            return UIColor(named: "appBlack")
        case .blue:
            return UIColor(named: "appBlue")
        case .gray:
            return UIColor(named: "appGray")
        case .lightGray:
            return UIColor(named: "appLightGray")
        case .red:
            return UIColor(named: "appRed")
        case .separatorColor:
            return UIColor(named: "appSeparatorColor")
        case .green:
            return UIColor(named: "appGreen") 
        }
    }
}

You can use it like this:

userNameTextField.textColor = UIColor.appColor(.gray)

Upvotes: 35

Kishore Kumar

Reputation: 4375

In Xcode 11 press command + shift + L , it will open a snippet , select last one like i showed in image drag and drop .

Upvotes: 52

user2421361

Reputation: 1301

UIColor(named: "myColor")

Source: WWDC 2017 Session 237 —— What's New in MapKit

Caveat: Your project's Deployment Target needs to be set to iOS 11.0.

Upvotes: 130

Ashish

Reputation: 3137

 // iOS
 let color = UIColor(named: "SillyBlue")

 // macOS
 let color = NSColor(named: "SillyBlue")

Upvotes: 10

robmathers

Reputation: 3638

Short Version

Add a colour set to an asset catalog, name it and set your colour in the attributes inspector, then call it in your code with UIColor(named: "MyColor").

Full Instructions

In the asset catalog viewer, click the plus button at the bottom right of the main panel and choose New Color Set
Click on the white square, and select the Attributes Inspector (right-most icon in the right pane)
From there you can name and choose your colour.
To use it in your code, call it with UIColor(named: "MyColor"). This returns an optional, so you'll need to unwrap it in most cases (this is probably one of the few cases where a force unwrap is acceptable, given you know the colour exists in your asset catalog).

Upvotes: 36

Cœur

Reputation: 38657

(short answer to the question update: there is UIColor(named: "MyColor") in Xcode 9.0)

Answering the original question:

you create your color set

you find your color among your snippets and you drag-n-drop it

it will translate to a color literal when looking at the source code:

#colorLiteral(red: 0, green: 0.6378085017, blue: 0.8846047521, alpha: 1)

You notice how the values of red, green and blue are different? It's because I defined them using Color Space Display P3, but the colorLiteral is using Color Space sRGB.

Upvotes: 50

How can we use Assets Catalog Color Sets?

Answers (12)

Short Version

Full Instructions

Related Questions