wxr
2020-03-05 0bdc0a135dbe31761b53f432ed34f347f0a4e36b
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//using System;
//using AVFoundation;
//using Foundation;
//using MediaPlayer;
//using Shared;
//using UIKit;
 
//namespace com.hdl.on
//{
//    public static class Volume
//    {
//        /// <summary>
//        /// 声音变化事件
//        /// </summary>
//        public static Action<int> VolumeChange;
//        /// <summary>
//        /// 设置当前音量
//        /// </summary>
//        /// <param name="volume">Volume.</param>
//        public static int MusicVolume
//        {
//            set
//            {
//                if ((DateTime.Now - dateTime).TotalMilliseconds < 2000)
//                {
//                    return;
//                }
//                foreach (var view in BaseViewController.MPVolumeView.Subviews)
//                {
//                    if (view.GetType().Name == "UISlider")
//                    {
//                        (view as UISlider).SetValue((float)Math.Round(value / 100.0f, 2, MidpointRounding.AwayFromZero), false);
//                        beforeVolume = (view as UISlider).Value;
//                        //System.Console.WriteLine("接收到更新音量:" + (float)Math.Round(value / 100.0f, 2, MidpointRounding.AwayFromZero) + "  " + beforeVolume);
//                        break;
//                    }
//                }
//            }
//        }
//        static System.DateTime dateTime = DateTime.MinValue;
//        /// <summary>
//        /// 之前的音量
//        /// </summary>
//        static float beforeVolume;
//        public static void Init()
//        {
//            NSNotificationCenter.DefaultCenter.AddObserver(new NSString("AVSystemController_SystemVolumeDidChangeNotification"),
//                                                                       (obj) =>
//                                                                       {
//                                                                           //如果应用进入后台,不执行音量变化
//                                                                           if (UIApplication.SharedApplication.ApplicationState != UIApplicationState.Active || "Audio/Video" != obj.UserInfo.ObjectForKey(new NSString("AVSystemController_AudioCategoryNotificationParameter")).ToString())
//                                                                           {
//                                                                               return;
//                                                                           }
//                                                                           //System.Console.WriteLine("接收到音量变化事件");
//                                                                           dateTime = DateTime.Now;
//                                                                           var tempValue = obj.UserInfo.ObjectForKey(new NSString("AVSystemController_AudioVolumeNotificationParameter"));
//                                                                           if (tempValue == null)
//                                                                           {
//                                                                               return;
//                                                                           }
//                                                                           try
//                                                                           {
//                                                                               //有时转换失败,可能有时值有问题
//                                                                               var volume = 100 * float.Parse(tempValue.ToString());
//                                                                               volume = (float)Math.Round(volume, 2, MidpointRounding.AwayFromZero);
//                                                                               //System.Console.WriteLine("音量变化事件:" + volume + "  " + beforeVolume * 100);
//                                                                               if (VolumeChange != null && beforeVolume * 100 != volume)
//                                                                               {
//                                                                                   VolumeChange((int)volume);
//                                                                               }
//                                                                           }
//                                                                           catch { }
//                                                                       });
//        }
//    }
//}