Sample JS plugin for iOS app

jsPluginCode.js

const circle1 = 1;
const circle2 = 2;
const circle3 = 3;

let time = 0.0;
let step = 0;

function tick(delta) {
    time += delta;
    if (time >= 1000) {
        time -= 1000;
        loopStep();
    }
}

function loopStep() {
    switch (step) {
        case 0:
            updateProperty(circle1, 'color', '#50ff0000');
            updateProperty(circle2, 'color', '#ffffff00');
            updateProperty(circle3, 'color', '#5000ff00');
            break;

        case 1:
            updateProperty(circle1, 'color', '#50ff0000');
            updateProperty(circle2, 'color', '#50ffff00');
            updateProperty(circle3, 'color', '#ff00ff00');
            break;

        case 2:
            updateProperty(circle1, 'color', '#ffff0000');
            updateProperty(circle2, 'color', '#50ffff00');
            updateProperty(circle3, 'color', '#5000ff00');
            break;
    }
    step = (step + 1) % 3;
}

function start(width, height) {
    const circleRadius = height / 10;
    addWidget('Circle', {
        tag: circle1,
        x: width / 2,
        y: circleRadius * 2,
        radius: circleRadius,
        color: '#ffff0000',
    });

    addWidget('Circle', {
        tag: circle2,
        x: width / 2,
        y: circleRadius * 5,
        radius: circleRadius,
        color: '#50ffff00',
    });

    addWidget('Circle', {
        tag: circle3,
        x: width / 2,
        y: circleRadius * 8,
        radius: circleRadius,
        color: '#5000ff00',
    });
}