@td-design/rn-hooks/lib/commonjs/useCountdown/index.js

从ahooks里面抽取的一些在rn项目里可以使用的hooks。提高开发效率

'use strict';

var _tslib = require('../_virtual/_tslib.js');
var react = require('react');
var index = require('../useAppState/index.js');
var index$1 = require('../useMemoizedFn/index.js');

function useCountDown(seconds) {
    var appState = index();
    var timer = react.useRef();
    var _a = _tslib.__read(react.useState(null), 2), target = _a[0], setTarget = _a[1];
    var _b = _tslib.__read(react.useState(0), 2), count = _b[0], setCount = _b[1];
    var start = index$1(function () {
        setTarget(add(new Date(), seconds));
    });
    var stop = index$1(function () {
        setTarget(null);
        setCount(0);
    });
    react.useEffect(function () {
        if (target === null || appState !== 'active')
            return;
        setCount(diff(new Date(), target));
        timer.current = setInterval(function () {
            setCount(diff(new Date(), target));
        }, 1000);
        return function () {
            if (timer.current) {
                clearInterval(timer.current);
                timer.current = undefined;
            }
        };
    }, [target]);
    react.useEffect(function () {
        if (count === 0) {
            stop();
        }
    }, [count, stop]);
    return {
        count: count,
        start: start,
        stop: stop,
    };
}
function add(date, seconds) {
    return new Date(date.getTime() + seconds * 1000);
}
function diff(now, target) {
    return Math.max(Math.trunc((target.getTime() - now.getTime()) / 1000 + 0.5), 0);
}

module.exports = useCountDown;