import React from "react";
import { StyleSheet, View } from "react-native";
import TimerCountdown from "react-native-timer-countdown";

const App = () => (
  <View style={styles.container}>
    <TimerCountdown
      initialSecondsRemaining={1000 * 60}
      onTick={(secondsRemaining) => console.log("tick", secondsRemaining)}
      onComplete={() => console.log("complete")}
      formatSecondsRemaining={(milliseconds) => {
        const remainingSec = Math.round(milliseconds / 1000);
        const seconds = parseInt((remainingSec % 60).toString(), 10);
        const minutes = parseInt(((remainingSec / 60) % 60).toString(), 10);
        const hours = parseInt((remainingSec / 3600).toString(), 10);
        const s = seconds < 10 ? '0' + seconds : seconds;
        const m = minutes < 10 ? '0' + minutes : minutes;
        let h = hours < 10 ? '0' + hours : hours;
        h = h === '00' ? '' : h + ':';
        return h + m + ':' + s;
      }}
      allowFontScaling={true}
      style={{ fontSize: 20 }}
    />
  </View>
);

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center"
  }
});

export default App;

import React, { Component } from "react";
import { StyleSheet, Button, View } from "react-native";
import TimerCountdown from "react-native-timer-countdown";

const A = () => (
  <View style={styles.container}>
    <B />
    <TimerCountdown initialSecondsRemaining={1000 * 60} />
  </View>
);
export default A;

class B extends Component {
  state = { isPressed: false };
  render() {
    return (
      <View styles={{ flex: 1 }}>
        <Button
          title={`${this.state.isPressed ? "Button Pressed" : "Button"}`}
          onPress={() => {
            this.setState({ isPressed: true });
          }}
        />
      </View>
    );
  }
}


const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center"
  }
});