shenhuan111 2014-12-20 13:28 采纳率: 64.3%
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unity c#中为什么不能直接更改transform.position.x的值?

The reason you can't directly alter the position vector is because it's actually a copy, not the actual position stored on the transform.

transform.position <--- returns a copy of the position
transform.position.x <--- the "x" value of the copy
transform.position.x = 7.0f <--- sets the "x" value on the copy

C# throws an error because you're setting the "x" value on a copy, which is then destroyed. It's a pointless line that if the compiler didn't pick up on it, could cause a tonne of hair pulling.

UnityScript gets around this when it compiles by converting your code and firing the C# setter:
transform.position.x = 7.0f
when compiled in UnityScript, translates (more or less) to:
var tempVector : Vector3 = transform.position;
tempVector.x = 7.0f;
transform.position = tempVector;

You can infer that because if you replicate this with a custom C# class, you can track as the getters/setters are invoked.

权威资料是这样解释的。这个如何解释,transform.position(position是Vector3类型的),transform是类。vector3是结构体的,vector3创建的可以直接修改x值,为什么这个position.x就不可以,实在不明白了?

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