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