无法自动从ng类添加/删除类以切换所选选项卡

我就是这么做的:

        <ul class="nav nav-tabs" style="margin-bottom: 2px !important; margin-left: 1px; border: none; color: black; font-weight: bold;">
            <li ng-class="{'mainTabs-active' : isActive(1) == true}" class="mainTabs" ng-click="activeTab = 1" ng-if="userAccess == 1">
                <a href="#/main/clients"> Clientes </a>
            </li>
            <li ng-class="{'mainTabs-active' : isActive(2) == true}" class="mainTabs" ng-click="activeTab = 2" ng-if="userAccess == 1">
                <a href="#/main/inventory"> Catálogos </a>
            </li>
            <li ng-class="{'mainTabs-active' : isActive(3) == true}" class="mainTabs" ng-click="activeTab = 3" ng-if="userAccess == 1">
                <a href="#/main/configuration"> Configuración </a>
            </li>
            <li ng-class="{'mainTabs-active' : isActive(4) == true}" class="mainTabs" ng-click="activeTab = 4" ng-if="userAccess == 1">
                <a href="#/main/employees"> Empleados </a>
            </li>
            <li ng-class="{'mainTabs-active' : isActive(5) == true}" class="mainTabs" ng-click="activeTab = 5" ng-if="userAccess == 2">
                <a href="#/main/sales"> Autorizaciones </a>
            </li>
            <li ng-class="{'mainTabs-active' : isActive(6) == true}" class="mainTabs" ng-click="activeTab = 6" ng-if="userAccess == 3">
                <a href="#/main/conciliation"> Conciliación </a>
            </li>
        </ul>

$scope.isActive = function(value){
    if($scope.activeTab==value){
        return true;
    }
    else{
        return false;
    }
}

我尝试在没有函数的情况下进行比较,只是通过执行ng class=“{mainTabs-active”:active==n}直接比较值,但也不起作用。

我已经尝试过寻找类似的变量名和CSS,可能会影响这一点,但找不到东西。这很简单,但我已经坚持了一段时间了,似乎还没有找到解决办法。