今天上班打开昨天的程序运行，昨天跑的很溜的程序今天竟然crash了，好郁闷啊！下面附上crash的栈打印信息：

经过一番调试终于找到了原因，程序crash是因为CALayer的位置中含有不存在的数,就是有的地方除以0了。
如果程序总出现上述崩溃信息，就是在某个地方除以0了。

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