Timeline PlayableBehaviour和PlayableAsset
做个例子，在timeline中，控制某text在不同时间，更新text内容并显示
上图的PlayableTrack即是PlayableBehaviour
而后面的内容，既是PlayableAsset
先将PlayableTrack拖到timeline前面
然后将创建好的PlayableAsset拖拽到PlayableTrack轨道上
接下来分别创建这两个脚本
在创建PlayableBehaviour时，会自动生成一些方法，如下
// Called when the owning graph starts playing
public override void OnGraphStart(Playable playable) {
}
// Called when the owning graph stops playing
public override void OnGraphStop(Playable playable) {
}
// Called when the state of the playable is set to Play
public override void OnBehaviourPlay(Playable playable, FrameData info) {
}
// Called when the state of the playable is set to Paused
public override void OnBehaviourPause(Playable playable, FrameData info) {
}
// Called each frame while the state is set to Play
public override void PrepareFrame(Playable playable, FrameData info) {
}
我们创建文件PlayableTrackTalk修改内容如下
using UnityEngine.Playables;
using UnityEngine.UI;
// A behaviour that is attached to a playable
public class PlayableTrackTalk : PlayableBehaviour
{
public Text talkText1;
public string talkStr1;
// Called when the state of the playable is set to Play
public override void OnBehaviourPlay(Playable playable, FrameData info) {
talkText1.text = talkStr1;
}
}
接下来创建PlayableAsset时会自动生产以下内容
using UnityEngine.Playables;
[System.Serializable]
public class NewPlayableAsset : PlayableAsset
{
// Factory method that generates a playable based on this asset
public override Playable CreatePlayable(PlayableGraph graph, GameObject go) {
return Playable.Create(graph);
}
}
我们创建文件PlayableAssetTalk并修改内容如下
using UnityEngine.Playables;
using UnityEngine.UI;
[System.Serializable]
public class PlayableAssetTalk : PlayableAsset
{
public ExposedReference
public string talkStr;
// Factory method that generates a playable based on this asset
public override Playable CreatePlayable(PlayableGraph graph, GameObject go) {
return Playable.Create(graph);
}
}
我们要通过ExposedReference来将一些unity控件，显示在inspector上，并获取它
可以看见，我们可以将场景内的控件拖进来了，
然而此时，将这个PlayableAsset拖到轨道上并为控件赋值，点运行，结果并没有什么卵用=。=
接下来我们需要通过在PlayableAsset中实例化对应PlayableBehaviour【即PlayableTrackTalk】，并将，PlayableAsset的值赋予PlayableBehaviour，
using UnityEngine.Playables;
using UnityEngine.UI;
[System.Serializable]
public class PlayableAssetTalk : PlayableAsset
{
public ExposedReference
public string talkStr;
// Factory method that generates a playable based on this asset
public override Playable CreatePlayable(PlayableGraph graph, GameObject go) {
PlayableTrackTalk talkPlayable = new PlayableTrackTalk();
talkPlayable.talkText1 = talkText.Resolve(graph.GetResolver());
talkPlayable.talkStr1 = talkStr;
return ScriptPlayable
}
}
同时，要使控件在轨道上可以被playableTrack控制，我们需要在PlayableAsset的CreatePlayable中，实例化对应playableTrack【即PlayableTrackTalk】，并将PlayableAsset中的对应值赋予playableTrack，
赋值时要使用Resolve(graph.GetResolver())来为unity的控件赋值
talkPlayable.talkText1 = talkText.Resolve(graph.GetResolver());
接下来，将PlayableTrackTalk拖到Timeline上，在将PlayableAssetTalk拖到PlayableTrackTalk的轨道上，赋值，运行即可