text: //
  // Copyright 2016 Google Inc. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  // http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  //
  #import <UIKit/UIKit.h>
  
  @interface ViewController : UIViewController
  
  @property (strong, nonatomic) IBOutlet UIButton *recordButton;
  @property (strong, nonatomic) IBOutlet UIButton *stopButton;
  - (IBAction)recordAudio:(id)sender;
  - (IBAction)stopAudio:(id)sender;
  
  @end