![]() If flex is a negative number it also uses height and width but if there is not enough space it will shrink to its minHeight and minWidth. When flex: 0 - it’s sized accordingly to the height and width and is inflexible. That means that flex equates to flexGrow:, flexShrink: 1, flexBasis: 0. When flex prop is a positive number, then components become flexible and will adjust to the screen respective to its flex value. It’s created to keep the proportions and consistency of the layout on different screen sizes.įlexbox works very similar to CSS on the Web with just a few exceptions which are really easy to learn. First of all, FLEXBOXĬomponents can control layout with a flexbox algorithm. In this short article I’ll try to show you a few tools and tricks which can help you deal with the huge range of devices without going crazy! 1. When you code an app with React Native you can add up these numbers and then multiply it by two, since every device can be rotated. Native Apps developers always put a lot of effort into making beautiful apps with a rich UI and which are stable on every supported device. This article was originally published on on Oct. This way, UI elements scale up and down depending on device resolutions.How to Create Responsive Layouts in React Native Similarly, if you use heightPercentageToDP instead of widthPercentageToDP, then it will translate accordingly to the device's height. So no matter what the device width is, the above View will translate it to 80% of its device’s width. Similarly, heightPercentageToDP takes in a percentage of a screen's height that a UI element should cover and returns a calculated DP, depending on the current device's screen height.Ĭonsider an example where the device has a width of 480 DP. WidthPercentageToDP takes in a percentage of a screen's width that a UI element should cover and returns a calculated, DP depending on the current device's screen width. The two most important functions we need for making a responsive layout are widthPercentageToDP and heightPercentageToDP. However, density-independent pixels (DP) vary from device to device, so it cannot be directly used for creating a responsive layout. The bigger the device, the more DP it has. Only padding, margin, width, height, minWidth, minHeight, maxWidth, maxHeight, flexBasis can have percentage values according to this commit.ĭensity independent pixels (DP) are different than traditional pixels. ![]() Percentages work well on the web, but they don’t support all the style properties in React Native. React Native accepts either percentages or density-independent pixels (DP) for its styles. What happens in these cases, is those different devices have different pixel ratios. As such, when you open the same app in another device of another dimension, it looks distorted. When you make a React Native app, you make it work with a device of one dimension. Problem with responsive layout in React Native Otherwise, it will throw an error in the terminal. Note that the emulator must be installed and started already before typing a. This will automatically run the iOS Simulator even if it's not opened. Type the following to start running the app: $ yarn start Now go ahead and change the directory to responsive-react-native-layout using the following command: $ cd responsive-react-native-layout This will create a folder called responsive-react-native-layout, which will bootstrap a new Expo project. It will then prompt you to choose a template. To create a new project using expo-cli, type the following in the terminal: $ expo init responsive-react-native-layout ![]() Make sure to update expo-cli if you haven't updated it in a while, since expo releases are quickly out of date. To make sure we’re on the same page, the following are the versions used in this tutorial. If it’s not installed already, then go ahead and install it: $ yarn global add expo-cli ![]() If you don't have yarn already installed, then install it here.Īlso, make sure you’ve already installed expo-cli. Throughout this tutorial, we’ll be using yarn. You’ll also need the Expo client installed on your mobile device or a compatible simulator installed on your computer Instructions on how to do this can be found here. Prerequisitesįor this tutorial, you need a basic knowledge of React Native and some familiarity with Expo. To make the app look good on phone, tablets, and a variety of other devices, we need to scale all of our styles. Unlike CSS, there is no such thing as media queries in React Native. But a problem arises when trying to make the app responsive. React Native makes it easy to write code once and run your apps on both Android and iOS at the same time. ![]()
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