Unity脚本功能正常但触发编辑器崩溃问题求助

Hey there! Let's break down why your Unity editor might be crashing when stopping play mode or entering Build mode, even though your loop doesn't seem to be stuck. Here are the most likely culprits and fixes:

1. Null Reference Errors During Play Mode Shutdown #

When you stop play mode, Unity starts destroying scene objects and cleaning up systems in the background—but your Update method might still run one last frame while these references are already null. Accessing things like Camera.main, Mouse.current, or shipController after they've been destroyed will trigger a hard crash.

Fix: Add null checks for all critical references at the start of your Update method:

void Update() {
    // Exit early if any core reference is missing
    if (shipController == null || Camera.main == null || Mouse.current == null) {
        return;
    }

    // Rest of your original code...
}

2. Race Condition with Instantiated Object Cleanup #

Your currentPlacementBlock is instantiated and destroyed dynamically, but when stopping play mode, Unity's object destruction order might cause conflicts. For example, if the editor tries to destroy your script's GameObject while you're still modifying currentPlacementBlock in Update, it can lead to a crash.

Fix: Add cleanup logic in OnDisable or OnDestroy to ensure the placement block is properly disposed of when the script is disabled or destroyed:

void OnDisable() {
    // Clean up the placement block if it exists
    if (currentPlacementBlock != null) {
        Destroy(currentPlacementBlock);
        currentPlacementBlock = null;
    }
}

3. Floating-Point Precision Risks in Loop Logic #

While you confirmed your loop iterates a small number of times, comparing posToTarget == Vector2.zero directly with floating-point values is risky. Tiny precision errors could cause unexpected behavior in edge cases (like when the mouse position aligns almost perfectly with grid steps), which might trigger crashes in rare scenarios.

Fix: Replace the direct vector comparison with a magnitude threshold check:

// Replace if (posToTarget == Vector2.zero) with:
if (posToTarget.sqrMagnitude < 0.0001f) { // Use sqrMagnitude for better performance
    shotPastTargetOrExact = true;
}

4. Input System Object Access During Shutdown #

If you're using Unity's new Input System, Mouse.current might get cleaned up before your Update method finishes running when stopping play mode. Accessing a destroyed input system object can cause a low-level crash.

Fix: Double-check that you're only accessing Mouse.current when it's valid (the null check in point 1 covers this, but you can also add a guard clause specifically for input):

var mousePosition = Mouse.current.position.ReadValue();
if (float.IsNaN(mousePosition.x) || float.IsNaN(mousePosition.y)) {
    return; // Skip frame if input is invalid
}

Start with the null checks and OnDisable cleanup first—those are the most common causes of this type of crash. Let me know if any of these fixes resolve your issue!

内容的提问来源于stack exchange，提问作者Gary Gary