the for statement in unity 3d for iphone

Questions & Answers
1

hello!

I want transfer a unity project to iphone platform.

After I deal with #pragma strict and Getcomponent issue ,I found runtime error still happen:

the error message: NullReferenceException: Object reference not set to an instance of an object

the statement:

var gos : Renderer[];
gos = GetComponentsInChildren(Renderer) as Renderer[];

var go : Renderer;

---> for( go in gos ){ 

    go.enabled=false;</p>

}

it seems the original use of "for" can not use in iphone platform,WHY?????

thank you.

2

It's because you're trying to cast a `Component[]` to a `Renderer[]`, which won't work. The as operator will silently return null if the cast did not work.

Try this instead:

var components = GetComponentsInChildren(Renderer);
for (var component in components)
{
    var renderer = component as Renderer; // Renderer is a Component, so it's OK.
    renderer.enabled = false;
}

The line of code that was faulty in your provided code snippet wasn't the for loop. It was this:

gos = GetComponentsInChildren(Renderer) as Renderer[];

The cast (`as Renderer[]`) would return `null`, because `Renderer[]` isn't derived from `Component[]` and vice versa.