react-native-wheel-time-picker

Simple and pure js time picker for react-native. It provides the same UI for Android and IOS. You can use the Wheel component independantly.

| Android | IOS | | :----------------------------------------------------------------------------------------------------------------------------: | :----------------------------------------------------------------------------------------------------------------------------: | | | |

Installation

npm install react-native-wheel-time-picker

Props

TimePicker Props

| | necessary | types | default | info | | -------------- | :-------: | ------------------------------ | ---------- | ------------------------------------------------------------------------------------------------------------------ | | label | | string | undefined | | | value | | number | undefined | millisecond value after 0 0 | | onChange | | (newValue: number) => void | undefined | changing value function | | containerStyle | | ViewStyle | undefined | container style | | onScroll | | (scrollState: boolean) => void | undefined | a callback function. it may be used when the TimePicker is inside of a scroll view to preventing the outer scroll. | | textStyle | | TextStyle | undefined | text style | | timeFormat | | ( TimeType | string )[] | ['ampm', 'hours12', ':', 'min'] | | wheelProps | | StyleProps type of Wheel | undefined | see next |

Wheel StyleProps

| | necessary | types | default | info | | -------------- | :-------: | --------- | --------- | ---------------------------------------------- | | wheelHeight | | number | 70 | Wheel height | | displayCount | | number | 5 | Number of items to show in front of the wheel. | | containerStyle | | ViewStyle | undefined | Wheel container style | | itemHeight | | number | 15 | Wheel item height | | selectedColor | | string | 'black' | Selected item color | | disabledColor | | string | 'gray' | Other items color | | textStyle | | TextStyle | undefined | Text style of each item |

Other Wheel Props

Below props are provided by the TimePicker component.

| | necessary | types | default | info | | -------- | :-------: | ------------------------------ | --------- | ------------------------------------------------------------------------------------------------------------------ | | value | v | string | | item value | | setValue | v | (newValue: string) => void | | Changing value function | | values | v | string[] | | List of values to choose from | | onScroll | | (scrollState: boolean) => void | undefined | a callback function. it may be used when the TimePicker is inside of a scroll view to preventing the outer scroll. |

Usage

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

import TimePicker from 'react-native-wheel-time-picker';
import { useMemo } from 'react';

const MILLISECONDS_PER_MINUTE = 60 * 1000;
const MILLISECONDS_PER_HOUR = 60 * 60 * 1000;
const MILLISECONDS_PER_DAY = 24 * MILLISECONDS_PER_HOUR;

export default function App() {
  const [timeValue, setTimeValue] = useState(Date.now() % MILLISECONDS_PER_DAY);
  const [hour, min] = useMemo(() => {
    return [
      Math.floor(timeValue / MILLISECONDS_PER_HOUR),
      Math.floor((timeValue % MILLISECONDS_PER_HOUR) / MILLISECONDS_PER_MINUTE),
      Math.floor((timeValue % MILLISECONDS_PER_MINUTE) / 1000),
    ];
  }, [timeValue]);
  return (
    <View style={styles.container}>
      <TimePicker
        value={timeValue}
        wheelProps={{
          wheelHeight: 70,
          itemHeight: 15,
        }}
        onChange={(newValue) => setTimeValue(newValue)}
      />
      <Text style={styles.timeValue}>{`${hour < 10 ? '0' : ''}${hour}:${
        min < 10 ? '0' : ''
      }${min}`}</Text>
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
  },
  timeValue: {
    marginVertical: 20,
  },
});

Animated sine function

The sin function of the AnimatedMath.ts file is really inspired by 'react-native-animated-math' package. We tried to import the package and use it, but there was a performance issue, so we created a new function that omitted some terms. The function uses the Taylor series approximation as below.

 x - x^3 / 3! + x^5 / 5! - x^7 / 7!

The x value range is [-PI , PI] so it's maximum error will be

PI^9 / 9! = 0.08214 .....

If the x range is [-PI/2, PI/2] than the maximum error will be about 0.00016 ....

Contributing

See the contributing guide to learn how to contribute to the repository and the development workflow.

License

MIT