//=========================================//
// UNITY METHODS
//=========================================//
protected void Awake()
{
CSingletionAttribute attribute = Attribute.GetCustomAttribute(typeof(T), typeof(CSingletionAttribute)) as CSingletionAttribute;
bool persistent = false;
// Get set attribute
if (attribute != null)
{
persistent = attribute.IsPersistent;
}
// Create instance
if (_instance == null)
{
InstantiateSingleton();
// Is this singleton marked to live forever?
if (persistent)
{
DontDestroyOnLoad(this.gameObject);
}
return;
}
// Is this singleton marked to live forever?
if (persistent)
{
DontDestroyOnLoad(this.gameObject);
}
// Isn't this singleton first selected?
if (this.GetInstanceID() != _instance.GetInstanceID())
{
Destroy(this.gameObject);
}
}
//=========================================//
// PUBLIC METHODS
//=========================================//
/// <summary>
/// Instantiate singleton if not yet
/// </summary>
public static void InstantiateSingleton()
{
// Is inited?
if (IsInstantiated || IsDestroyed)
{
return;
}
// Check if singleton exists in scene yet
Type type = typeof(T);
T[] singletons = FindObjectsOfType <T>();
int singletonsMax = singletons.Length;
if (singletonsMax > 0)
{
if (singletonsMax > 1)
{
Debug.LogWarning("In scene is more than one singleton of type " + type + ". First will stay, others die!");
for (int i = 1; i < singletonsMax; i++)
{
Destroy(singletons[i].gameObject);
}
}
// Set first as live singleton
_instance = singletons[0];
_instance.gameObject.SetActive(true);
_instance.Init();
IsInstantiated = true;
IsDestroyed = false;
return;
}
//NOTE: moved IsInstantiated to the end
// Set as inited
//IsInstantiated = true;
IsDestroyed = false;
// Create singleton gameobject into scene
GameObject go;
CSingletionAttribute attribute = Attribute.GetCustomAttribute(type, typeof(CSingletionAttribute)) as CSingletionAttribute;
// If class doesn't have singleton attribute
if (attribute == null || string.IsNullOrEmpty(attribute.Name))
{
go = new GameObject();
}
else
{
string prefabName = attribute.Name;
go = Instantiate(Resources.Load <GameObject>(prefabName));
if (go == null)
{
Debug.LogError("Couldn't find singleton prefab in Resources dir. Name: " + prefabName + " | Type: " + type);
}
}
// Set name
if (attribute == null)
{
go.name = "-S-" + type.Name;
}
else
{
go.name = "-S" + (attribute.IsPersistent ? "P-" : "-") + type.Name;
}
// Set inherited script as component
if (_instance == null)
{
_instance = go.GetComponent <T>() ?? go.AddComponent <T>();
}
//NOTE: IsInstantiated has been moved here
IsInstantiated = true;
_instance.Init();
}
