【错误处理：】Collection <__NSArrayM: 0x12ec10e0> was mutated while being enumerated.
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- *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSArrayM: 0x12ec10e0> was mutated while being enumerated.'
用个for循环去读取一个数组A，然后删除一些元素的操作，就会出现上面的错误
这个是因为一个数组不能同时有一个线程去读取，然后另个线程去写，所以出错
解决方法：新建temp Array ，再做处理！
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