NGUI中删除Big Eye Road子物体后无法重新实例化求助

Let's walk through what's causing your Big Eye Road to fail at instantiating after deletion, and fix it up:

1. The #1 Culprit: Null Reference Exception Crashing Your Code #

Looking at your Big Eye Road logic, you're reusing a shared p variable across both redBead and blueBead checks. Here's the problem:

• If redBead is true and isWholeColumnNull is true, you call NGUITools.SetActive(p, false) before ever assigning p an instance.
• If p is null (which it will be on first run, or if no prior instantiation happened), this throws a NullReferenceException. Unity will immediately stop executing the rest of myFunction—so your instantiation code never even gets to run.

Compare this to your Big Road/Bead Road code: they don't have any risky calls to null objects, so they run all the way through.

2. Missing (or Misplaced) Child Deletion for Big Eye Road #

You mentioned you're calling DeleteChildrens(pos_big_eye_road[0]), but that line doesn't appear in the code snippet you shared for myFunction. If:

• You're deleting children after calculating isWholeColumnNull, the check will use the old child state to decide whether to instantiate.
• You're not deleting them at all, new instances will stack on top of old ones (but you said deletion works, so this is less likely).

Fixes to Get Your Big Eye Road Working #

Fix 1: Guard Against Null Before Calling SetActive

Add a null check every time you try to modify p before it's been instantiated:

if (redBead) {
    if (isWholeColumnNull) {
        // Only deactivate if p actually exists
        if (p != null) {
            NGUITools.SetActive(p, false);
        }
    } else {
        // Your existing instantiation code here
    }
}

// Do the same for the blueBead block
if (blueBead) {
    if (isWholeColumnNull) {
        if (p != null) {
            NGUITools.SetActive(p, false);
        }
    } else {
        // Your existing instantiation code here
    }
}

Fix 2: Explicitly Delete Big Eye Road Children First

Make sure you call your deletion method before processing the redBead/blueBead logic. This ensures old children are gone, and any state checks (like isWholeColumnNull) use the fresh, empty parent:

// Add this right before your redBead/blueBead checks
DeleteChildrens(pos_big_eye_road[0]);

if (redBead) {
    // ... existing code
}

Fix 3: Stop Reusing the Same p Variable (Optional but Safer)

Reusing p means you'll only ever have a reference to the last instantiated Big Eye Road object. If you need to manage multiple instances, use a local variable instead:

if (redBead) {
    if (isWholeColumnNull) {
        // If you need to turn off all existing children, loop through them instead
        foreach (Transform child in pos_big_eye_road[0]) {
            NGUITools.SetActive(child.gameObject, false);
        }
    } else {
        // Use a local variable instead of the shared p
        GameObject bigEyeInstance = Instantiate(prefab_big_eye_road[0]) as GameObject;
        bigEyeInstance.transform.SetParent(pos_big_eye_road[0]);
        bigEyeInstance.transform.localScale = Vector3.one;
        bigEyeInstance.GetComponent<UISprite>().spriteName = "symble_banker_bigroad-bigeyeroad";
        NGUITools.SetActive(bigEyeInstance, true);
    }
}

These changes should resolve the execution crash and ensure your Big Eye Road instantiation runs just like your other roads do.

内容的提问来源于stack exchange，提问作者Ginxxx