ewindso/react-native-measure-text

Measure text height without laying it out.

React Native Measure Text

Measure text height without laying it out.

Installation

Automatic installation

$ yarn add react-native-measure-text

$ react-native link react-native-measure-text

Manual installation

iOS

1. In XCode, in the project navigator, right click Libraries ➜ Add Files to [your project's name]
2. Go to node_modules ➜ react-native-measure-text and add RNMeasureText.xcodeproj
3. In XCode, in the project navigator, select your project. Add libRNMeasureText.a to your project's Build Phases ➜ Link Binary With Libraries
4. Run your project (Cmd+R)<

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import io.github.airamrguez.RNMeasureTextPackage; to the imports at the top of the file
• Add new RNMeasureTextPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-measure-text'
   project(':react-native-measure-text').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-measure-text/android')
   

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-measure-text')
   

Usage

import MeasureText from 'react-native-measure-text';

const texts = [
  'This is an example',
  'This is the second line'
];
const width = 100;
const fontSize = 15;

class Test extends Component {
  state = {
    heights: [],
  }
  async componentDidMount() {
    const heights = await MeasureText.measure({(
      texts, /* texts to measure */
      width, /* container width */
      fontSize
    );
    this.setState({ heights });
  }
  render() {
    const { heights } = this.state;
    return (
      <View>
        {texts.map((text, i) => (
          <Text
            key={`text-${i}`}
            style={{
              width,
              fontSize,
              height: heights[i],
            }}
          >
            {text}
          </Text>
        ));
      );}
    </View>
  }
}