在viewDidUnload之后调用dealloc吗?

A quick question, after viewDidUnload does the dealloc also get called? I am asking with regards to pickerData, it was my understanding that the variable would be released when the dealloc gets called. My reason for asking is that I have noticed in one book that the author sets pickerData to nil in the viewDidUnload. Is this harmless overkill, maybe even good practice, or is there no scenario where one would not be called without the other.A quick question, after viewDidUnload does the