Layout

Flexbox

Flexbox is a layout mode providing for the arrangement of elements on a page such that the elements behave predictably when the page layout must accommodate different screen sizes and different display devices. By default flexbox arranges children in a column. But you can change it to row using flexDirection: 'row'.

flexDirection

const Direction = (props)=>{
  return (
    <View style={styles.container}>
      <Box/>
      <Box/>
      <Box/>
      <View style={{flexDirection:'row'}}>
        <Box/>
        <Box/>
        <Box/>
      </View>
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex:1,
    backgroundColor: '#AED581',
  }
});

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Alignment axis

const AlignmentAxis = (props)=>{
  return (
    <View style={styles.container}>
      <Box />
      <View style={{flex:1, alignItems:'flex-end', justifyContent:'flex-end'}}>
        <Box />
        <Box />
      </View>
      <Box />
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex:1,
    backgroundColor: `#69B8CC`,
  },
  text:{
    color: 'white',
    textAlign:'center'
  }
});

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Alignment

const Alignment = (props)=>{
  return (
    <View style={styles.container}>
      <Box/>
      <View style={{alignItems:'center'}}>
        <Box/>
        <View style={{flexDirection:'row'}}>
          <Box/>
          <Box/>
          <Box/>
        </View>
        <Box/>
      </View>
      <Box/>
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex:1,
    backgroundColor: `#69B8CC`,
  },
  text:{
    color: 'white',
    textAlign:'center'
  }
});

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Flex size

const FlexSize = (props)=>{
  return (
    <View style={styles.container}>
      <View style={{flex:0.1}}>
        <Box style={{flex:0.7}}/>
        <Box style={{backgroundColor: 'yellow'}}/>
        <Box/>
        <Box style={{flex:0.3, backgroundColor: 'yellow'}}/>
      </View>
      <View style={{flex:0.1}}>
        <Box style={{flex:1}}/>
        <Box style={{backgroundColor: 'yellow'}}/>
        <Box/>
        <Box style={{flex:1, backgroundColor: 'yellow'}}/>
      </View>
    </View>
  )
}

const styles = StyleSheet.create({
  container: {
    flex:1,
    flexDirection:'row',
    backgroundColor: colors[1],
  },
});

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More about Facebook's flexbox implementation here (opens new window).