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原创 OC 中 for循环和for in循环的区别

关于OC的for in 循环机制。     废话少说直接上代码  如下的代码在运行时是会报错的 错误信息是（<__NSArrayM: 0xa4fc000> was mutated while being enumerated.）NSMutableArray* arr = [NSMutableArray arrayWithObjects:@"1",@"2",@"3", nil];for ...