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iOS 13 Semantic UI: Dark Mode, Dynamic Type, and SF Symbols
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aaronbrethorst Adds examples of semantic text colors to Color Stack
The intent of the label text is derived from WWDC 2019 Session 808 "What's New in iOS Design". See https://developer.apple.com/videos/play/wwdc2019/808/?time=328

It isn't clear to me why UIColor.tertiaryLabel and UIColor.placeholderText both exist, but at least they seem to have essentially the same RGB values, so whatev.
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Semantic Colors Adds examples of semantic text colors to Color Stack Nov 13, 2019
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README.md

iOS 13 Semantic UI: Dark Mode, Dynamic Type, and SF Symbols

This sample project makes it easy to visualize all of iOS 13's semantic and adaptable colors, preferred fonts for text styles, and built-in icons.

Semantic colors automatically adapt to system settings, like Dark Mode, to give your app a UI that is always legible.

Semantic fonts are used in Dynamic Type to make sure that your font sizes always scale with to meet the user's needs.

SF Symbols is an icon font that gives you and your apps access to over 1,000 Apple designer-created icons.

Light Mode

Screenshot of the example project

Dark Mode

Screenshot of the example project in Dark Mode

Fonts

Screenshot of the example project's fonts viewer

SF Symbols

Screenshot of the example project's SF Symbols viewer

Colors

Adaptable Colors

Some colors are used by system elements and applications. These return named colors whose values may vary between different contexts and releases. Do not make assumptions about the color spaces or actual colors used.

  • .systemRed
  • .systemGreen
  • .systemBlue
  • .systemIndigo
  • .systemOrange
  • .systemPink
  • .systemPurple
  • .systemTeal
  • .systemYellow

Adaptable Grays

Shades of gray. systemGray is the base gray color. The numbered variations, systemGray2 through systemGray6, are grays which increasingly trend away from systemGray and in the direction of systemBackgroundColor.

In UIUserInterfaceStyleLight: systemGray1 is slightly lighter than systemGray. systemGray2 is lighter than that, and so on.

In UIUserInterfaceStyleDark: systemGray1 is slightly darker than systemGray. systemGray2 is darker than that, and so on.

  • .systemGray
  • .systemGray2
  • .systemGray3
  • .systemGray4
  • .systemGray5
  • .systemGray6

Label Colors

Foreground colors for static text and related elements.

  • .label
  • .secondaryLabel
  • .tertiaryLabel
  • .quaternaryLabel

Text Colors

Foreground color for placeholder text in controls or text fields or text views.

  • .placeholderText

Link Color

Foreground color for standard system links.

  • .link

Separators

Foreground colors for separators (thin border or divider lines). separatorColor may be partially transparent, so it can go on top of any content. opaqueSeparatorColor is intended to look similar, but is guaranteed to be opaque, so it will completely cover anything behind it. Depending on the situation, you may need one or the other.

  • .separator
  • .opaqueSeparator

Fill Colors

Fill colors for UI elements. These are meant to be used over the background colors, since their alpha component is less than 1.

systemFillColor is appropriate for filling thin and small shapes. Example: The track of a slider.

secondarySystemFillColor is appropriate for filling medium-size shapes. Example: The background of a switch.

tertiarySystemFillColor is appropriate for filling large shapes. Examples: Input fields, search bars, buttons.

quaternarySystemFillColor is appropriate for filling large areas containing complex content. Example: Expanded table cells.

  • .systemFill
  • .secondarySystemFill
  • .tertiarySystemFill
  • .quaternarySystemFill

Background Colors

We provide two design systems (also known as "stacks") for structuring an iOS app's backgrounds. Each stack has three "levels" of background colors. The first color is intended to be the main background, farthest back. Secondary and tertiary colors are layered on top of the main background, when appropriate.

Inside of a discrete piece of UI, choose a stack, then use colors from that stack. We do not recommend mixing and matching background colors between stacks. The foreground colors above are designed to work in both stacks.

Stack 1: systemBackground - Use this stack for views with standard table views, and designs which have a white primary background in light mode.

  • .systemBackground
  • .secondarySystemBackground
  • .tertiarySystemBackground

Grouped Background Colors

Stack 2: systemGroupedBackground - Use this stack for views with grouped content, such as grouped tables and platter-based designs. These are like grouped table views, but you may use these colors in places where a table view wouldn't make sense.

  • .systemGroupedBackground
  • .secondarySystemGroupedBackground
  • .tertiarySystemGroupedBackground

Non-Adaptable Colors

lightTextColor is always light, and darkTextColor is always dark, regardless of the current UIUserInterfaceStyle. When possible, we recommend using labelColor and its variants, instead.

  • .lightText
  • .darkText

Fonts

Font text styles, semantic descriptions of the intended use for a font returned by UIFont.preferredFont(forTextStyle:).

  • .largeTitle
  • .title1
  • .title2
  • .title3
  • .headline
  • .subheadline
  • .body
  • .callout
  • .footnote
  • .caption1
  • .caption2

Icons (SF Symbols)

SF Symbols provides a set of over 1,500 consistent, highly configurable symbols you can use in your app. Apple designed SF Symbols to integrate seamlessly with the San Francisco system font, so the symbols automatically ensure optical vertical alignment with text for all weights and sizes.

Third Party Libraries

SFSymbol Library

https://github.com/Nirma/SFSymbol

MIT License

Copyright (c) 2019 Nicholas Maccharoli 

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

License

Color names, fonts, icons, and descriptive text (c) Apple Inc. All code in this repository is:

MIT License

Copyright (c) 2019 Aaron Brethorst

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
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