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Unity：在GameObject上实例化预制 - 错误对象为空

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在我的Unity游戏中，我有一个车辆预制件与Edy的车辆物理资产一起工作 . 我试图在GameObject的位置和旋转上实例化一个选定的车辆预制件 .

在我的场景中运行我的代码以生成车辆时，我收到此错误

ArgumentException：要实例化的Object为null ArgumentException：要实例化的Object为null . UnityEngine.Object.CheckNullArgument（System.Object arg，System.String message）（at C：/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs：239）UnityEngine.Object.Instantiate（UnityEngine.Object original，Vector3 position ，Quaternion rotation）（在C：/buildslave/unity/build/Runtime/Export/UnityEngineObject.cs：151）UnityEngine.Object.Instantiate [VehicleController]（EVP.VehicleController原始，Vector3位置，四元数旋转）（在C：/ buildslave / unity / build / Runtime / Export / UnityEngineObject.cs：206）VehicleSpawner.spawnVehiclesInFirstGarage（）（在Assets / Scripts / VehicleSpawner.cs：44）HandleGarage.Start（）（在Assets / Scripts / HandleGarage.cs：59）

script

车辆预制件是空的，因为车辆将由用户在游戏中选择 . （即使我选择了车辆预制件，我仍然会得到同样的错误）

我的代码用于在游戏对象上实例化车辆预制件

public EVP.VehicleTelemetry telemetryComponent;
public EVP.VehicleController vehiclePrefab;
public GameObject spawnObject;

public void spawnVehiclesInFirstGarage ()
{
    // Load saved JSON
    string jsonData = SecurePlayerPrefs.GetString ("vehicleNames");

    // Convert to Class
    Database loadedData = JsonUtility.FromJson<Database> (jsonData);

    // Loop through Owned Vehicles Garage
    for (int i = 0; i < loadedData.vehicleNames.Count; i++) {

        // Set up instantiate
        var vehicle = Resources.Load("Prefabs/" + (loadedData.vehicleNames [i]));
        vehiclePrefab = vehicle as EVP.VehicleController;

        // Spawn vehicle on game object
        EVP.VehicleController newVehicle = Instantiate(vehiclePrefab, spawnObject.transform.position, spawnObject.transform.rotation) as EVP.VehicleController;
        telemetryComponent.target = newVehicle;
    }
}
unity3d instantiation gameobject

1 回答

  • 1

    可能的解决方案

    • vehiclePrefab = vehicle as EVP.VehicleController; 可能导致问题，因为日志 var vehicle = Resources.Load("Prefabs/" + (loadedData.vehicleNames [i])); 已经给出 Sport Coupe (UnityEngine.GameObject) ，这是正确的类型 .

    而不是使用 as EVP.VehicleController ，尝试：

    // Set up instantiate
var vehiclePrefab = Resources.Load("Prefabs/" + (loadedData.vehicleNames [i])) as GameObject;

// Spawn vehicle on game object
GameObject newVehicle = Instantiate(vehiclePrefab, spawnObject.transform.position, spawnObject.transform.rotation);
EVP.VehicleController controller = newVehicle.GetComponent<EVP.VehicleController>();
telemetryComponent.target = newVehicle;

    这是Unity's documentation for loading prefabs via scripting .

    • 从错误消息中，似乎 void Start() 正在调用 spawnVehiclesInFirstGarage() . 如果是这样，请尝试将其放入 void Update() ，添加 if( prefab != null && !isInstantiated) 检查 .

    其他故障排除（如果解决方案不起作用）

    • 尝试通过检查器分配预制件，看看是否遇到同样的问题 .

    • 在现有代码上，尝试 Debug.Log(vehiclePrefab) .

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