有关设置NavigationbarItem.titleView的一个坑

今天遇到一个bug，
仅仅是设置了titleView，然后发现push出去再pop回来，内存和CPU占用暴涨，界面锁死。
然后去查了内存泄露发现没有任何问题。
后来去跑了Time Profile发现NavigationBar一直在做LayoutSubviews
后来才发现titleView里重写了layoutSubviews方法。
用autolayout实现了相关布局，就解决了问题。

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