Unity VideoPlayer播放视频 Slider控制播放进度

[code]using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Video;
public class ToPlayVideo : MonoBehaviour
{
public VideoClip[] videoClips;      // 视频的文件 参数
public Text videoTimeText;          // 视频的当前时间 Text
public Text videoNameText;          // 视频的总时长 Text
public Slider videoTimeSlider;      // 视频的时间 Slider
// 定义参数获取VideoPlayer组件和RawImage组件
internal VideoPlayer videoPlayer;
private RawImage rawImage;
public Texture pingBao;             // 屏保图片
// 当前视频的总时间值和当前播放时间值的参数
private int currentHour;
private int currentMinute;
private int currentSecond;
private int clipHour;
private int clipMinute;
private int clipSecond;

public Sprite play;
public Sprite pause;
private bool isPlay = true;          //是否正在播放视频
public Button playPauseButton;       //播放暂停按钮
public Button stopButton;            //停止播放按钮
public Button button1;
public Button button2;
public Button button3;
public Button button4;

// Use this for initialization
void Start()
{
//清空文本
videoNameText.text = "";
videoTimeText.text = "";

//获取场景中对应的组件
videoPlayer = this.GetComponent<VideoPlayer>();
rawImage = this.GetComponent<RawImage>();
videoPlayer.audioOutputMode = VideoAudioOutputMode.AudioSource;
videoPlayer.SetTargetAudioSource(0, this.GetComponent<AudioSource>());
videoPlayer.playOnAwake = false;
videoPlayer.IsAudioTrackEnabled(0);

playPauseButton.onClick.AddListener(PlayOrPause);
stopButton.onClick.AddListener(StopVideo);
button1.onClick.AddListener(delegate { OnClick(0); });
button2.onClick.AddListener(delegate { OnClick(1); });
button3.onClick.AddListener(delegate { OnClick(2); });
button4.onClick.AddListener(delegate { OnClick(3); });
}

// Update is called once per frame
void Update()
{
//如果videoPlayer没有对应的视频texture，则返回屏保
if (videoPlayer.texture == null)
{
rawImage.texture = pingBao;
return;
}
//把VideoPlayerd的视频渲染到UGUI的RawImage
rawImage.texture = videoPlayer.texture;
ShowVideoTime();
}

/// <summary>
/// 显示当前视频的时间
/// </summary>
private void ShowVideoTime()
{
// 当前的视频播放时间
currentHour = (int)videoPlayer.time / 3600;
currentMinute = (int)(videoPlayer.time - currentHour * 3600) / 60;
currentSecond = (int)(videoPlayer.time - currentHour * 3600 - currentMinute * 60);
// 把当前视频播放的时间显示在 Text 上
videoTimeText.text = string.Format("{0:D2}:{1:D2}:{2:D2}",
currentHour, currentMinute, currentSecond);
// 把当前视频播放的时间比例赋值到 Slider 上
videoTimeSlider.value = (float)(videoPlayer.time / videoPlayer.clip.length);
}

/// <summary>
/// 显示视频的总时长
/// </summary>
/// <param name="videos">当前视频</param>
void ShowVideoLength(VideoClip videos)
{
videoPlayer.clip = videos;
videoPlayer.Play();
videoTimeSlider.gameObject.SetActive(true);
clipHour = (int)videoPlayer.clip.length / 3600;
clipMinute = (int)(videoPlayer.clip.length - clipHour * 3600) / 60;
clipSecond = (int)(videoPlayer.clip.length - clipHour * 3600 - clipMinute * 60);
videoNameText.text = string.Format("{0:D2}:{1:D2}:{2:D2} ",
clipHour, clipMinute, clipSecond);
}

private void OnClick(int num)
{
switch (num)
{
case 0:
ShowVideoLength(videoClips[0]);
break;
case 1:
ShowVideoLength(videoClips[1]);
break;
case 2:
ShowVideoLength(videoClips[2]);
break;
case 3:
ShowVideoLength(videoClips[3]);
break;
case 4:
ShowVideoLength(videoClips[4]);
break;
default:
break;
}
}

/// <summary>
/// 视频播放暂停
/// </summary>
void PlayOrPause()
{
//如果视频片段不为空，并且视频画面没有播放完毕
if (videoPlayer.clip != null && (ulong)videoPlayer.frame < videoPlayer.frameCount)
{
//如果视频正在播放
if (isPlay)
{
playPauseButton.image.sprite = pause;
videoPlayer.Pause();
isPlay = false;
}
else
{
playPauseButton.image.sprite = play;
videoPlayer.Play();
isPlay = true;
}
}
}

void StopVideo()
{
videoPlayer.Stop();
playPauseButton.image.sprite = play;
videoTimeSlider.gameObject.SetActive(false);
videoNameText.text = "";
videoTimeText.text = "";
isPlay = true;
}
}

[code]using UnityEngine;
using UnityEngine.EventSystems;
/// <summary>
/// 继承 拖拽接口
/// </summary>
public class SliderEvent : MonoBehaviour, IDragHandler, IEndDragHandler
{
[SerializeField]
public ToPlayVideo toPlayVideo;        // 视频播放的脚本

// Use this for initialization
void Start()
{

}

// Update is called once per frame
void Update()
{

}

/// <summary>
/// 给 Slider 添加开始拖拽事件
/// </summary>
/// <param name="eventData"></param>
public void OnDrag(PointerEventData eventData)
{
toPlayVideo.videoPlayer.Pause();
SetVideoTimeValueChange();
}

/// <summary>
/// 当前的 Slider 比例值转换为当前的视频播放时间
/// </summary>
private void SetVideoTimeValueChange()
{
toPlayVideo.videoPlayer.time = toPlayVideo.videoTimeSlider.value * toPlayVideo.videoPlayer.clip.length;
}

/// <summary>
/// 给 Slider 添加结束拖拽事件
/// </summary>
/// <param name="eventData"></param>
public void OnEndDrag(PointerEventData eventData)
{
toPlayVideo.videoPlayer.Play();
}
}