dealloc 报错

在dealloc 中报错 It is possible that this object was over-released, or is in the process of deallocation.

问题代码：

[self.popView removeFromSuperview];

self.popView = nil;

分析原因，因为我没有使用到self.popView，self.popView在dealloc中会先初始化，这时候就报错了。

解决方法：

[_popView removeFromSuperview];

self.popView = nil;