app.js

....
$stateProvider.state('app.reply', {
                url: '/reply',
                views: {
                    'menuContent': {
                        templateUrl: 'reply.html',
                        controller: 'replyCtrl'
                    }
                }
            });
...

controller.js

....
Ctrls.controller('replyCtrl',
    ['$scope',function ($scope) {
            $scope.send = function (data) {
                console.log(data, $scope.textarea);
              
            };
        }]);
....

reply.html

<!--reply.html-->
<ion-view view-title="reply">
  <ion-content>
    <ion-list>
      <form>
        <div class="item item-input">
          <textarea ng-model="textarea" name="content" rows="3" placeholder="正文"></textarea>
        </div>
      </form>
    </ion-list>
    <div class="padding">
      <button ng-click="send(textarea)" class="button button-block button-positive">发送</button>
    </div>
  </ion-content>
</ion-view>