React Native Auto Size Text

React Native component for Android and iOS that provides several ways to resize text within a certain dimension/parent.

React Native component that provides several ways to resize text within a certain dimension/parent.

Installation

yarn react-native-auto-size-text

npm i react-native-auto-size-text

Usage

Import react-native-auto-size-text and ResizeTextMode

import { AutoSizeText, ResizeTextMode } from 'react-native-auto-size-text';

Choose one of the modes below:

MaxLines

Required props: fontSize, numberOfLines and mode.

<AutoSizeText
	fontSize={32}
	numberOfLines={2}
	mode={ResizeTextMode.max_lines}>
	This string will be automatically resized to fit on two lines.
</AutoSizeText>

MinFontSize

Required props: minFontSize, numberOfLines and mode.

<AutoSizeText
	numberOfLines={3}
	minFontSize={21}
	mode={ResizeTextMode.min_font_size}>
	This string's size will not be smaller than 21. It will be automatically 
	resized to fit on 3 lines.
</AutoSizeText>

Group

Required props: mode.

<AutoSizeText
	mode={ResizeTextMode.group}>
	This mode will fit the available space and sync their text size
</AutoSizeText>

StepGranularity

Required props: fontSize, numberOfLines, granularity and mode.

<AutoSizeText
	fontSize={48}
	numberOfLines={4}
	granularity={10}
	mode={ResizeTextMode.step_granularity}>
	This String changes its size with a stepGranularity of 10. It will be automatically 
	resized to fit on 4 lines.
</AutoSizeText>

PresetFontSizes

Required props: fontSizePresets, numberOfLines and mode.

<AutoSizeText
	fontSizePresets={[64,  42,  24]}
	numberOfLines={4}
	mode={ResizeTextMode.preset_font_sizes}>
	This String has only three allowed sizes: 64, 42 and 24. 
	It will be automatically resized to fit on 4 lines. 
	With this setting, you have most control
</AutoSizeText>

OverflowReplacement

Required props: fontSize, numberOfLines, overFlowReplacement and mode.

<AutoSizeText
	fontSize={32}
	numberOfLines={3}
	overFlowReplacement={'Text overflowing'}
	mode={ResizeTextMode.overflow_replacement}>
	This String's size will not be smaller than 32. 
	It will be automatically resized to fit on 3 lines. 
	Otherwise it will be replaced by a replacement string. Here's an example.
</AutoSizeText>

Props

name description type default fontSize Font size number 14 numberOfLines Number of lines before rescaling number none mode Resize text mode ResizeTextMode ResizeTextMode.max_lines minFontSize Minimum font size number none granularity Text resize granularity number none fontSizePresets Font size presets number[] none Overflowreplacement Replacement if the text overflows parent string '' style Text style

function: () => {} TextProps All other props

function: () => {}

Example with all modes

import React, {useState} from 'react';
import {ScrollView, StyleSheet, Text, TextInput, View} from 'react-native';
import {AutoSizeText, ResizeTextMode} from 'react-native-auto-size-text';

const App = () => {
  const [text, setText] = useState<string>('');

  return (
    <ScrollView
      style={styles.scrollViewContainer}
      contentContainerStyle={styles.container}>
      <TextInput
        style={styles.input}
        onChangeText={e => setText(e)}
        value={text}
      />

      <Text>MaxLines</Text>

      <View style={styles.textWrapper}>
        <AutoSizeText
          fontSize={64}
          numberOfLines={2}
          mode={ResizeTextMode.max_lines}>
          {text}
        </AutoSizeText>
      </View>

      <Text>MinFontSize</Text>
      <View style={styles.textWrapper}>
        <AutoSizeText
          numberOfLines={3}
          minFontSize={18}
          mode={ResizeTextMode.min_font_size}>
          {text}
        </AutoSizeText>
      </View>

      <Text>PresetFontSizes</Text>
      <View style={styles.textWrapper}>
        <AutoSizeText
          fontSizePresets={[50, 30, 10]}
          numberOfLines={3}
          mode={ResizeTextMode.preset_font_sizes}>
          {text}
        </AutoSizeText>
      </View>

      <Text>OverflowReplacement</Text>
      <View style={styles.textWrapper}>
        <AutoSizeText
          fontSize={12}
          numberOfLines={1}
          mode={ResizeTextMode.overflow_replacement}
          overFlowReplacement={'Text overflowing'}>
          {text}
        </AutoSizeText>
      </View>

      <Text>Group</Text>

      <View style={styles.textWrapper}>
        <AutoSizeText mode={ResizeTextMode.group} fontSize={2048}>
          {text}
        </AutoSizeText>
      </View>

      <Text>StepGranularity</Text>
      <View style={styles.textWrapper}>
        <AutoSizeText
          mode={ResizeTextMode.step_granularity}
          fontSize={64}
          numberOfLines={2}
          granularity={10}>
          {text}
        </AutoSizeText>
      </View>
    </ScrollView>
  );
};

const styles = StyleSheet.create({
  container: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  textWrapper: {
    borderColor: '#bcbcbc',
    borderRadius: 10,
    width: '80%',
    margin: 16,
    height: 200,
    borderWidth: 2,
  },

  scrollViewContainer: {
    flex: 1,
  },
  input: {
    height: 80,
    width: '100%',
    margin: 12,
    borderWidth: 1,
  },
});

export default App;

GitHub

https://github.com/juniorklawa/react-native-auto-size-text