在iOS8下没问题，但是在ios7下某几个页面出现莫名的卡死，CPU占用99%，用工具查了下，发现大部分卡的都是一些与scrollview、autolayout有关的函数，ui用到scrollview内嵌tableview，用storyboard和masonry结合写的约束，有人遇到类似问题的吗？
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Supplement 1 · Jul 10, 2015
换成普通代码布局之后就正常了，估计是scrollview用autolayout计算contentsize的某些函数占用的时间
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