简单的解决方法(感谢Chris LaPollo，作者 RW )

The easy fix (thanks to Chris LaPollo, an author on RW)

[self runAction:[SKAction scaleTo:0.5 duration:0]];

没有其他需要了.

奇怪的是你做不到

[self setScale:0.5];

收到此警告后，它确实起作用了-但是执行操作确实很奇怪！

As you get this warning, and it doenst work - but running an action does -- weird!!!

SKScene:设置SKScene的比例无效.

SKScene: Setting the scale of a SKScene has no effect.