关于UnityEnging.Object==null的建议

[oOtroyOo]

因为faq教程中提到了这个问题，所以我只是想提一个建议，加在教程里。 可惜的是，如果没有按照教程，没有预先配置一个IsNull()方法，那这个问题在Lua里写代码就很尴尬了。 经过我尝试，可以用以下代码解决，我这里版本为2019.4 ，其他Unity多种版本还没测试

参考Unity引擎源码为： https://github.com/Unity-Technologies/UnityCsReference/blob/2019.4/Runtime/Export/Scripting/UnityEngineObject.bindings.cs

        public override bool Equals(object other)
        {
            Object otherAsObject = other as Object;
            // A UnityEngine.Object can only be equal to another UnityEngine.Object - or null if it has been destroyed.
            // Make sure other is a UnityEngine.Object if "as Object" fails. The explicit "is" check is required since the == operator
            // in this class treats destroyed objects as equal to null
            if (otherAsObject == null && other != null && !(other is Object))
                return false;
            return CompareBaseObjects(this, otherAsObject);
        }

        public static bool operator==(Object x, Object y) { return CompareBaseObjects(x, y); }

也就是说可以Equals 正好调用了==重载的判断方法CompareBaseObjects 则可以用Equals来做判断

    if self.image ~= nil and self.image:Equals(nil) == false then
       ---
    end

[chexiongsheng]

我记得Equals不一定行

[XiuMingLin]

Equals有的时候并不能进行判空 if(self.m_Panel:GetComponent(typeof(CS.UnityEngine.Canvas)):Equals(nil)) then m_Panel上并没有Canvas组件但返回的为false

[oOtroyOo]

我不觉得@570189458你的案例有什么问题