Does this work for you?
angular.directive('extLabel', function() {
return {
restrict: 'E',
scope: {
api: '='
},
link: function(scope, iElement, iAttrs) {
scope.api = {
doSomething: function() { },
doMore: function() { }
};
}
};
});
From containing parent
<ext:label api="myCoolApi"></ext:label>
And in controller
$scope.myCoolApi.doSomething();
$scope.myCoolApi.doMore();