为什么在使用ARC + NSZombieEnabled时，对象不是dealloc ?

I converted my app to ARC and noticed that an object alloc'ed in one of my view controllers was not being dealloc'ed when that view controller was dealloc'ed. It took a while to figure out why. I have Enable Zombie Objects on for my project while debugging and this turned out to be the cause. Consider the following app logic:I converted my app to ARC and noticed that an o