我正在使用 Unity 增强现实。如果我调用其他类的公共值,为什么我的应用程序返回空值?
这些是我的课:
using UnityEngine;
using System.Collections;
public class GUIControlScript : MonoBehaviour {
public GUISkin MenuSkin;
public Texture BoxBackground;
public DefaultTrackableEventHandler DTEH;
public string ttx;
void OnGUI(){
Screen.orientation = ScreenOrientation.Landscape;
GUI.skin = MenuSkin;
GUI.Box(new Rect(0, 0, Screen.width, 600), BoxBackground);
GUI.BeginGroup(new Rect(Screen.width / 2 - 150, Screen.height / 2 - 150, 300, 300));
try
{
GUI.Button(new Rect(0, 0, 500, 500), ttx);
}
catch(System.Exception e)
{
}
GUI.EndGroup();
}
void Update()
{
ttx = DTEH.TrackableText; //This is the problem!
}
这是我调用变量的类
using UnityEngine;
public class DefaultTrackableEventHandler : MonoBehaviour,
ITrackableEventHandler
{
#region PRIVATE_MEMBER_VARIABLES
private TrackableBehaviour mTrackableBehaviour;
public string TrackableText = "";
#endregion // PRIVATE_MEMBER_VARIABLES
#region UNTIY_MONOBEHAVIOUR_METHODS
void Start()
{
mTrackableBehaviour = GetComponent<TrackableBehaviour>();
if (mTrackableBehaviour)
{
mTrackableBehaviour.RegisterTrackableEventHandler(this);
}
OnTrackingLost();
}
#endregion // UNTIY_MONOBEHAVIOUR_METHODS
#region PUBLIC_METHODS
// Implementation of the ITrackableEventHandler function called when the
// tracking state changes.
public void OnTrackableStateChanged(
TrackableBehaviour.Status previousStatus,
TrackableBehaviour.Status newStatus)
{
if (newStatus == TrackableBehaviour.Status.DETECTED ||
newStatus == TrackableBehaviour.Status.TRACKED)
{
OnTrackingFound();
}
else
{
OnTrackingLost();
}
}
#endregion // PUBLIC_METHODS
#region PRIVATE_METHODS
private void OnTrackingFound()
{
Renderer[] rendererComponents = GetComponentsInChildren<Renderer>();
// Enable rendering:
foreach (Renderer component in rendererComponents) {
component.enabled = true;
}
if (mTrackableBehaviour.TrackableName.Equals("farmasi"))
{
TrackableText = "farmasi";
}
Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " found");
}
private void OnTrackingLost()
{
Renderer[] rendererComponents = GetComponentsInChildren<Renderer>();
// Disable rendering:
foreach (Renderer component in rendererComponents) {
component.enabled = false;
}
Debug.Log("Trackable " + mTrackableBehaviour.TrackableName + " lost");
}
#endregion // PRIVATE_METHODS