SwiftUI code generation template for SwiftGen

SwiftUI code generation template for SwiftGen.md

Example of generated code

internal extension Color {
  // Assets.xcassets
  static var midnightBlue : Color { Color("midnightBlue", bundle: BundleToken.bundle) }
}

internal extension Image {
// Assets.xcassets
  static var abc : Color { Image("abc", bundle: BundleToken.bundle) }
}

Usage

  Color.midnightBlue // Color
  Image.abc // Image

swiftui-xcassets.stencil

// swiftlint:disable all
// Generated using SwiftGen — https://github.com/SwiftGen/SwiftGen

{% if catalogs %}
{% set forceNamespaces %}{{param.forceProvidesNamespaces|default:"false"}}{% endset %}
{% set accessModifier %}{% if param.publicAccess %}public{% else %}internal{% endif %}{% endset %}
import SwiftUI

{% macro casesBlock assets type prefix %}
  {% for asset in assets %}
  {% if asset.type == type %}
  static var {% if prefix %}{{prefix}}{% endif %}{{asset.name|swiftIdentifier:"pretty"|lowerFirstWord|escapeReservedKeywords}} : {{type|capitalize}} { {{type|capitalize}}("{{asset.value}}", bundle: BundleToken.bundle) }
  {% elif asset.items and ( forceNamespaces == "true" or asset.isNamespaced == "true" ) %}
    {% set prefixed_asset %}{% if prefix == "" %}{{asset.name|lowerFirstWord|swiftIdentifier:"pretty"}}_{% else %}{{prefix}}{{asset.name|lowerFirstWord|swiftIdentifier:"pretty"}}_{% endif %}{% endset %}
    {% call casesBlock asset.items type prefixed_asset %}
  {% elif asset.items %}
  {% call casesBlock asset.items type prefix %}
  {% endif %}
  {% endfor %}
{% endmacro %}
{{accessModifier}} extension Color {
  {% if catalogs.count > 1 %}
  {% for catalog in catalogs %}
  // {{catalog.name}}.xcassets
    {% set prefixed_catalog %}{{catalog.name|swiftIdentifier:"pretty"|lowerFirstWord}}_{% endset %}
    {% if forceNamespaces == "true" %} {% call casesBlock catalog.assets "color" prefixed_catalog %}{% else %}{% call casesBlock catalog.assets "color" "" %}{% endif %}
  {% endfor %}
  {% else %}
  // {{catalogs.first.name}}.xcassets
  {% set prefixed_catalog %}{{catalogs.first.name|swiftIdentifier:"pretty"|lowerFirstWord}}_{% endset %}
  {% if forceNamespaces == "true" %} {% call casesBlock catalogs.first.assets "color" prefixed_catalog %}{% else %}{% call casesBlock catalogs.first.assets "color" "" %}{% endif %}
  {% endif %}
}

{{accessModifier}} extension Image {
  {% if catalogs.count > 1 %}
  {% for catalog in catalogs %}
  // {{catalog.name}}.xcassets
    {% set prefixed_catalog %}{{catalog.name|swiftIdentifier:"pretty"|lowerFirstWord}}_{% endset %}
    {% if forceNamespaces == "true" %} {% call casesBlock catalog.assets "image" prefixed_catalog %}{% else %}{% call casesBlock catalog.assets "image" "" %}{% endif %}
  {% endfor %}
  {% else %}
  // {{catalogs.first.name}}.xcassets
  {% set prefixed_catalog %}{{catalogs.first.name|swiftIdentifier:"pretty"|lowerFirstWord}}_{% endset %}
  {% if forceNamespaces == "true" %} {% call casesBlock catalogs.first.assets "image" prefixed_catalog %}{% else %}{% call casesBlock catalogs.first.assets "image" "" %}{% endif %}
  {% endif %}
}

{% if resourceCount.image > 0 %}
{% endif %}
private final class BundleToken {
  static let bundle: Bundle = {
    Bundle(for: BundleToken.self)
  }()
}
{% else %}
// No assets found
{% endif %}

One more nice thing about extending Color and Image is getting type inference in places where it's applicable. For example:

Text("foo").foregroundColor(.carrot)

Not a major thing by any means, but still :)

Ah very good point! And you're right, it's not too hard to name custom colours a little more "custom-ly" than just "Red" 😅