was mutated while being enumerated
来源：互联网 发布：哥白尼式革命 知乎 编辑：程序博客网 时间：2024/05/24 03:37
翻译: "在枚举的时候发生了变化"
for...in...利用了快速枚举NSFastEnumerate，当我们想要改变数组变量中的数据或者删除数组中的数据的时候,不能用for...in...
Objective-C中的foreach循环与Java中的类似，在内部是用iterator（迭代器）实现遍历的。而不管是在Java还是C++中，一旦修改了被遍历对象，在修改前生成的iterator都会失效。
NSArray的枚举操作中有一条需要注意：对于可变数组进行枚举操作时，你不能通过添加或删除对象这类操作来改变数组容器。如果你这么做了，枚举器会很困惑，而你将得到未定义的结果。
解决办法：用for循环
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