Define a Theme ObjectĪ carefully put together design system following the spacing, colour, and typography practices above should be defined in the app‘s codebase as a theme object. Your “Body” text might use the “Merriweather” family with a regular font weight, and size 16.
Your “Header” text might be size 36, have a bold weight, and use the font family “Raleway”. A grouping of these typographic elements are defined together as a named text variant. Similar to spacing, it‘s best to stick to a limited set of font families, weights and sizes to achieve a coherent look throughout the app. As long as elements are using the “Background” semantic color, you can swap it between a light and dark color based on the chosen color scheme. It also allows you to easily swap out color schemes on the fly to, for example, easily accommodate a light and dark mode version of the app. This makes it easy to later change, for example, the “Primary” color to be green instead of blue. When referring to a color in the app, it should be through the semantic color mapping. Note that multiple semantic colors can be mapped to the same palette color, for example, both the “Danger” and “Failure” color could both map to “Dark Red”. Some examples are “Primary”, “Background”, “Danger”, “Failure”. The semantic colors - A set of names that map to and describe how the color palette should be applied, that is, what their functions are.“Blue”, “Light Orange”, “Dark Red”, “White”, “Black”. The color palette - This is the set of colors that’s used.I like to split these definitions up into two layers: When defining colors in a design system, it’s important not only to choose which colors to stick with, but also how and when they should be used. The order of sizes are easy to understand, and the system is extensible in both directions by prefixing with more X’s.
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There are many conventions to choose between when deciding how to name your spacing constants, but I've found the t-shirt size scale (XS, S, M, L, XL, etc) work best. This means that it’s preferred to stick to a small set of predefined spacing constants that’s used for all margins and paddings in the app. While sizes often vary greatly between different components presented on a screen, the spacing between them should often stay as consistent as possible to create a coherent look. Size and spacing are the two parameters used when defining the layout of an app.
Building a complete design system is a topic far too big to dig into here, but I want to point out three important areas that the system should define its rules for. A design system is commonly defined as a set of rules, constraints and principles that lay the foundation for how the app should look and feel.
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Create a Design SystemĪ prerequisite for being able to write clean and consistent styling code is for the design of the app to be based on a clean and consistent design system. With these questions in place, we came up with the following best practices that provided answers to them. Can we make working with styles in React Native a more enjoyable experience?.How do we allow the app to dynamically adapt its theme according to the user’s preferences, to support for example dark mode?.What can we do to make it easy to style the app to look great on multiple different device sizes and formats?.With a growing team working in different countries and time zones, how do we make sure that the app keeps a consistent style throughout all of its different screens?.We faced a number of problems with our current approach in Arrive, and these were the questions we needed to answer to take our styling workflow to the next level: However anyone working with a React app can benefit from applying these best practices, with or without using our library. They served as the guiding principles for the design of Restyle.
I'll walk you through the styling best practices we learned through this process. The end-product became Restyle, our open source library that allowed us to move forward quickly and easily in our transformation from Arrive to Shop. While our product designers worked on introducing a whole new design system that would decide the look and feel of the app, we on the engineering side took the initiative to evolve our thinking around how we work with styling of screens and components. The Shop app started from our React Native codebase for our previous package tracking app Arrive, with every screen receiving a complete visual overhaul to fit the new branding. In April, we announced Shop, our digital shopping assistant that brings together the best features of Arrive and Shop Pay.
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