我可以提供两种方法来处理这个函数。你可以在循环更新中用最大最小值匹配对象的坐标，或者你可以在屏幕边界之外添加游戏结束触发区域。例如：

bool isGameOver;
float xMaxValue = 10; // X value (or -X) of Your right/left screen borders
float yMaxValue = 15; // Y value of Your top screen border
float yMinValue = -5;// Y value of Your bottom screen border
private void Update() {
    Vector3 playerPos = transform.position;
    If (playerPos.x < -xMaxValue || playerPos.x > xMaxValue  ||
        playerPos.y < yMinValue || playerPos.y > yMaxValue ) {
        isGameOver = true;
    }

或边界区域上的脚本（选中其collaider组件“Is trigger”复选框）：

void OnTriggerEnter2D(Collider2D col) {
    // PlayerScriptName - name of script on Your player GameObject
    // Or You can compare tags, or use other approaches to check 
    // is triggered object a player
    if (col.gameObject.TryGetComponent<PlayerScriptName>
        (out PlayerScriptName playerScript)) {
        // In this case field isGameOver must have 
        // public access level (in PlayerScriptName class):
        playerScript.isGameOver = true;
    }
}

如果你的意思是它从一个环境中掉下来，然后显示游戏结束。你只需要下面的简单代码。

[SerializeField]
private float fallYThreshold = -10; // Limit y fall
private void Update()
{
    if (transform.position.y <= fallYThreshold)
    {
        GameOver() //Run game over method here too
    }
}