What are the .primary and .secondary colors in SwiftUI?

Question

In the new SwiftUI, the type Color is very similar to UIColor from UIKit.

There are the common colors, as expected, but there is the addition of two other colors that I noticed:

• .primary
• .secondary

There is nothing in the Apple Documentation for the descriptions of the different Colors.

• What are these colors?
• Which one should I use for certain things?

Answer 1

SwiftUI seems to be incomplete compared to what is provided by UIColor. The primary and secondary refers to the text colors, which are the UIColor.label and UIColor.secondaryLabel.

A simple extension to provide more UIColor:

public extension Color {     static let lightText = Color(UIColor.lightText)     static let darkText = Color(UIColor.darkText)      static let label = Color(UIColor.label)     static let secondaryLabel = Color(UIColor.secondaryLabel)     static let tertiaryLabel = Color(UIColor.tertiaryLabel)     static let quaternaryLabel = Color(UIColor.quaternaryLabel)      static let systemBackground = Color(UIColor.systemBackground)     static let secondarySystemBackground = Color(UIColor.secondarySystemBackground)     static let tertiarySystemBackground = Color(UIColor.tertiarySystemBackground)      // There are more.. }