加载SKTexutre崩溃在枚举时发生突变。

I'm having problems with the following code, which loads an SKTexture by calling its size. The code crashes at random about 1 out of every 100 runs at the line where size is called. There are some other SKTexture methods for pre-loading the images but they also cause a crash even more frequently! I use TextureAtlases and to prevent the crash all of my SKTexure loads happen through this method. I'm having problems with the following code, wh