javascript determine what browser is being used on iPhone devices

Question

This is the code I'm using to determine what browser user is using on iphone.

var browser = (function (agent) {
        switch (true) {
            case agent.indexOf("edge") > -1: return "MS Edge (EdgeHtml)";
            case agent.indexOf("edg") > -1: return "MS Edge Chromium";
            case agent.indexOf("opr") > -1 && !!window.opr: return "opera";
            case agent.indexOf("chrome") > -1 && !!window.chrome: return "chrome";
            case agent.indexOf("trident") > -1: return "Internet Explorer";
            case agent.indexOf("firefox") > -1: return "firefox";
            case agent.indexOf("safari") > -1: return "safari";
            default: return "other";
        }
    })(window.navigator.userAgent.toLowerCase());

However, Here it states that all browsers must use safari user agent so the code above will return safari even when using chrome on iphone. Is there a way to determine if chrome is being used in iPhone?