UnityEngine.Object 并不是真正的C#对象，并非引用后就可以一直使用了，如果有外部释放的可能性，需要在使用前判空。
void TestDestroy()
{
var test = new GameObject("test");
Debug.Log(test == null); // False
Debug.Log(object.ReferenceEquals(test, null)); // False
Object.DestroyImmediate(test);
Debug.Log(test == null); // True
Debug.Log(object.ReferenceEquals(test, null)); // False
}另外不要继承 UnityEngine.Object, 判空是不正确的,
void TestInherit()
{
var test = new StringObj();
test.Value = "test";
UnityEngine.Object testObj = test;
UnityEngine.Object testObjNull = null;
Debug.Log("TestObject begin");
Debug.Log(test == null); // True
Debug.Log(testObj == null); // True
Debug.Log(testObj is StringObj); // True
Debug.Log(test.Value); // test
Debug.Log(((StringObj)testObj).Value); // test
Debug.Log(object.ReferenceEquals(testObj, null)); // False
Debug.Log(object.ReferenceEquals(testObjNull, null)); // True
Object.DestroyImmediate(test);
Debug.Log("TestObject end");
}参考
- Forums > Unity Community Support > UnityEngine.Object
-
Playmaker Forum » Playmaker Help & Tips » Playmaker Help » Making custom FsmObject types?
WARNING: Unity.Object do not obey garbage collections, they only get cleaned up if you call manually Resources.UnloadUnusedAssets() else on mobile you might get to a memory crash eventually if you use a lot of these.