效果：

代码

<div class="layui-form-item">
   <label class="layui-form-label layui-required-title">对此次活动内容输出是否满意？</label>
    <div class="layui-input-block">
        <input type="radio" name="activityContent" value="1" title="是" lay-verify="radioReq">
        <input type="radio" name="activityContent" value="0" title="否" lay-verify="radioReq">
    </div>
</div>

//自定义验证规则
form.verify({
    // 单选
    radioReq: function(value,item){
        let $ = layui.$;
        let verifyName=$(item).attr('name')
            , verifyType=$(item).attr('type')
            ,formElem=$(item).parents('.layui-form')//获取当前所在的form元素，如果存在的话
            ,verifyElem=formElem.find('input[name='+verifyName+']')//获取需要校验的元素
            ,isTrue= verifyElem.is(':checked')//是否命中校验
            ,focusElem = verifyElem.next().find('i.layui-icon');//焦点元素
        if(!isTrue || !value){
            //定位焦点
            focusElem.css(verifyType=='radio'?{"color":"#FF5722"}:{"border-color":"#FF5722"});
            //对非输入框设置焦点
            focusElem.first().attr("tabIndex","1").css("outline","0").blur(function() {
                focusElem.css(verifyType=='radio'?{"color":""}:{"border-color":""});
            }).focus();
            return '必填项不能为空';
        }
    }
});