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异常Crash之 NSGenericException,NSArray was mutated while being enumerated

  *** Terminating app due to uncaught exception ‘NSGenericException‘, reason: ‘*** Collection <__NSArrayM: 0x17542520> was mutated while being enumerated.‘

  从字面上不难理解,Crash的原因在于我们一边遍历数组,一边修改该数组数据。例如:
      NSMutableArray *OriginalArray = [NSMutableArray arrayWithObjects:@"1",@"2",@"3",@"3",@"4",nil];
  for (id obj in OriginalArray){
    if ([obj isEqualToString:@"3"]){
      [OriginalArray removeObject:obj]
    }
  }

      很自然我们会想到copy一个数组,在副本数组中进行遍历操作,如果符合条件我们就在原始数组中进行处理。
      NSMutableArray *DuplicateArray = [OriginalArray mutableCopy];
      for(id obj in DuplicateArray){
    if ([ob isEqualToString:@"3"]){
      [OriginalArray removeObject:obj];
    }
  }

异常Crash之 NSGenericException,NSArray was mutated while being enumerated