pouziti.js

// před tim
<TouchableOpacity onPress={() => this.handleToggleDay('Mo')} style={[styles.weekIcontouch, this.selected('Mo')]}>
  <Text style={[styles.weekIcon, this.selectedText('Mo')]}>{I18n.t('_general.week.mondayShort')}</Text>
</TouchableOpacity>
<TouchableOpacity onPress={() => this.handleToggleDay('Tu')}>
  <Text>{I18n.t('_general.week.tuesdayShort')}</Text>
</TouchableOpacity>
... a dalsi dny v tydnu

//komponenta
class TouchableDay extends React.Component {
  _handlePress = () => {
    this.props.onDayPress(this.props.dayCode)
  }
  
  return() {
    return (
      <TouchableOpacity onPresst={this._handlePress} style={this.props.style}>
        {this.props.children}
      </TouchableOpacity>
    )
  }
}


// použití
class Days extends React.Component {
  _handleDayPress = (dayCode) => {
    console.log(dayCode)
  }

  render() {
    const days = ['mo', 'tu', 'we', 'th', 'fr', 'sa', 'su']
    return (
      days.map(day => {
        return <TouchableDay dayCode={day} onDayPress={this._handleDayPress}><Text>{I18n.t('_general.week.%s', day)}</Text></TouchableDay>
      })
    )
  }
}