Thursday, 20 December 2018

React native - Checkboxes and date pickers for IoS

This article will look at checkboxes and date pickers for IoS apps in React Native. For checkboxes, we use the built-in Switch control. For Date pickers we use the built-in DatePickerIOS control.
This is the basic JS / JSX to get you started! Note the use of a basic state variable to keep track of the chosenDate. The onDateChange callback uses an arrow inline function to update the state variable. We also set the minimum and maximum datetime allowed and some othern nice props of the control! App.js

import React from 'react';
import { StyleSheet, Text, View, DatePickerIOS, Switch } from 'react-native';

export default class App extends React.Component {

  constructor(props){
    super(props);
    this.state = { chosenDate : new Date(), isDatePickerVisible: false };

    this.setDate = this.setDate.bind(this);
  }

  setDate(newDate){
    this.setState({chosenDate: newDate })
  }


  render() {
    return (
      <View style={styles.container}>
 
        <Switch onValueChange={(val) => this.setState({ isDatePickerVisible : val })} value={this.state.isDatePickerVisible} ios_backgroundColor={"aliceblue"} trackColor={true} />
        <Text style={{ display: this.state.isDatePickerVisible ? "none" : "flex"}}>Choose datetime..</Text>
          
        <View style={{ display: this.state.isDatePickerVisible ? "flex" : "none" }}>
         <DatePickerIOS locale="no" mode={"datetime"} minuteInterval={10} minimumDate={new Date(2018,11,1)} maximumDate={new Date(2018,11,31)}
          style={{ borderWidth: 1, borderColor: 'gray'}} onDateChange={this.setDate} date={this.state.chosenDate} />
         <Text>{this.state.chosenDate.toLocaleDateString() + " " + this.state.chosenDate.toLocaleTimeString()}</Text>
        </View>
  
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
  },
});





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