检查检查器中的数组是否为空 [英] Check whether an array in the inspector is empty

问题描述

我有一个公共数组，应该在检查器中填充该数组，如果该数组为空，我想做些事情.该数组在检查器大小= 0"中为空

I have a public array that should be filled in the inspector, and I want to do something if that array is empty. That array is empty in the inspector "size = 0"

public GameObject[] objects;

    void CheckArray ()
    {
        if (objects.Length < 0 ) // this doesn't work
        {
            Debug.Log("Empty!");  
        }
        else 
        {
            Debug.Log("Not Empty"); // this gets logged out
        }
    }

以上操作无效，我尝试了其他操作，但也无效:

The above doesn't work, I tried something else but also doesn't work:

void CheckArray ()
    {
        if (objects == null ) // this doesn't work
        {
            Debug.Log("Empty!");  
        }
        else 
        {
            Debug.Log("Not Empty");  // this gets logged out
        }
    }

推荐答案

您的if语句 if(objects.Length< 0)错误.

数组为空时通常为 0 .当它为 0 时， if(objects.Length< 0)永远不会为真，因为您正在检查数组长度是否小于 0 而不是如果数组长度等于 0 ..

Array is usually 0 when empty. When it is 0, if (objects.Length < 0 ) will never be true because you are checking if array length is less than 0 instead of if array length is equals to 0..

应为 if(objects.Length == 0)或 if(objects.Length == 0)

好吧，这行得通，但是对我来说没有任何意义，因为当我添加时一个对象并检查"objects [0]"，它将返回该对象，这意味着包含1个对象的数组的索引将为0，但索引相同时间长度"为0表示它为空?

Ok this worked but it doesn't make any sense to me, because when I add an object and check for "objects[0]" it returns that object, meaning an array with 1 object in it will be indexed at 0, but at the same time a "Length" of 0 means it's empty?

有一个数组大小，有元素.当我说为空时，我的意思是不要在编辑器中设置尺寸.由于 objects 是公共变量，因此Editor将为其赋予默认值 0 .那个 0 是我说空数组时的意思. Debug.Log(objects.Length); 将输出 0 .

There is an array size, there are elements. When I say empty, I meant not setting the size from the Editor. Since objects is a public variable, Editor will give it default value of 0. That 0 is what I meant when I say empty array.The Debug.Log(objects.Length); will output 0.

空数组:

非空数组:

在这种情况下，即使 Element 1 为 null ，否则 Debug.Log(objects.Length); 应该打印3.分配给它. objects.Length 将始终等于编辑器中设置的大小.

In this case, Debug.Log(objects.Length); should print 3 even though that Element 1 is null or nothing is assigned to it. objects.Length will always equals to the size set in the Editor.

GameObject camera = objects[0];
GameObject someObj = objects[1]; //ELEMENT IS NULL
GameObject dLight = objects[2];

是否要检查每个单个元素是否为空?

Want to check if each individual element is null?

for (int i = 0; i < objects.Length; i++)
{
    if (objects[i] == null)
    {
        Debug.Log("Empty!: " + i);
    }
    else
    {
        Debug.Log("Not Empty: " + i);
    }
}

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