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ClerkTheme

The ClerkTheme is used to customize the appearance of Clerk iOS components by adjusting colors, fonts, and design properties. It provides a comprehensive theming system that allows you to create a consistent visual experience across all Clerk components.

Structure

ClerkTheme consists of three main properties:

  • colors - Color properties for various UI elements.
  • fonts - Font properties for different text styles.
  • design - Design properties like border radius.

Colors

The colors property contains the following color options:

  • Name
    primary
    Type
    Color
    Description

    The primary color used throughout the components.

  • Name
    background
    Type
    Color
    Description

    The background color for containers.

  • Name
    input
    Type
    Color
    Description

    The background color used for input fields.

  • Name
    danger
    Type
    Color
    Description

    The color used for error states.

  • Name
    success
    Type
    Color
    Description

    The color used for success states.

  • Name
    warning
    Type
    Color
    Description

    The color used for warning states.

  • Name
    foreground
    Type
    Color
    Description

    The color used for text.

  • Name
    mutedForeground
    Type
    Color
    Description

    The color used for secondary text.

  • Name
    primaryForeground
    Type
    Color
    Description

    The color used for text on the primary background.

  • Name
    inputForeground
    Type
    Color
    Description

    The color used for text in input fields.

  • Name
    neutral
    Type
    Color
    Description

    The color that will be used to generate the neutral shades the components use.

  • Name
    ring
    Type
    Color
    Description

    The color of the ring when an interactive element is focused.

  • Name
    muted
    Type
    Color
    Description

    The color used for muted backgrounds.

  • Name
    shadow
    Type
    Color
    Description

    The base shadow color used in the components.

  • Name
    border
    Type
    Color
    Description

    The base border color used in the components.

Fonts

The fonts property contains the following font options based on iOS Dynamic Type:

  • Name
    largeTitle
    Type
    Font
    Description
  • Name
    title
    Type
    Font
    Description
  • Name
    title2
    Type
    Font
    Description
  • Name
    title3
    Type
    Font
    Description
  • Name
    headline
    Type
    Font
    Description
  • Name
    subheadline
    Type
    Font
    Description
  • Name
    body
    Type
    Font
    Description
  • Name
    callout
    Type
    Font
    Description
  • Name
    footnote
    Type
    Font
    Description
  • Name
    caption
    Type
    Font
    Description
  • Name
    caption2
    Type
    Font
    Description

Design

The design property contains the following design options:

  • Name
    borderRadius
    Type
    CGFloat
    Description

    The border radius used throughout the components. By default, this is set to 6.0.

Usage

You can customize Clerk iOS components by creating a ClerkTheme and applying it to the SwiftUI environment.

Apply a custom theme to all Clerk components

To customize all Clerk components in your app, create a ClerkTheme and apply it to your root view using the environment.

import SwiftUI
import Clerk

struct MyApp: App {
  var body: some Scene {
    WindowGroup {
      ContentView()
        .environment(\.clerkTheme, customTheme)
    }
  }

  let customTheme = ClerkTheme(
    colors: .init(
      primary: .blue,
    ),
    design: .init(
      borderRadius: 12.0
    )
  ) 
}

Apply a theme to specific components

You can apply a theme to specific Clerk components by using the environment modifier on individual views. The theme used here will apply to all children of this view.

struct SignInView: View {
  var body: some View {
    AuthView()
      .environment(\.clerkTheme, customTheme)
  }

  let customTheme = ClerkTheme(
    colors: .init(
      primary: .purple,
    )
  )
}

Adjust a specific property of the theme

You can adjust a specific property of the theme by modifying a single property.

struct SignInView: View {
  var body: some View {
    AuthView()
      .environment(\.clerkTheme.colors.primary, .green)
  }
}

Custom fonts

You can customize fonts by providing a font family name or individual font specifications.

Using a font family name

struct CustomFontView: View {
  var body: some View {
    AuthView()
      .environment(\.clerkTheme, customTheme)
  }

  let customTheme = ClerkTheme(
    fonts: .init(fontFamily: "Helvetica Neue")
  )
}

Using individual font specifications

struct CustomFontView: View {
  var body: some View {
    AuthView()
      .environment(\.clerkTheme, customTheme)
  }

  let customTheme = ClerkTheme(
    fonts: .init(
      largeTitle: .init(name: "Helvetica Neue", size: 34.0),
      title: .init(name: "Helvetica Neue", size: 28.0),
      title2: .init(name: "Helvetica Neue", size: 22.0),
      title3: .init(name: "Helvetica Neue", size: 20.0),
      headline: .init(name: "Helvetica Neue", size: 18.0),
    )
  )
}

Light and Dark Mode Support

Clerk iOS components automatically support both light and dark mode appearance, adapting seamlessly to the user's system preferences.

Light Mode Dark Mode

Using Asset Catalog Colors

For more sophisticated appearance support, create colors in your Asset Catalog with separate light and dark variants:

extension ClerkTheme {
  static let brandTheme = ClerkTheme(
    colors: .init(
      primary: Color(.brandPrimary), // Asset with light/dark variants
      background: Color(.brandBackground),
      foreground: Color(.brandText),
      danger: Color(.brandDanger)
    )
  )
}

If Clerk's prebuilt theming doesn't meet your specific needs, you can create completely custom authentication flows using the Clerk API. For more information, see the custom flow guides.

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