获取-[NSNull countByEnumeratingWithState:objects:count:]

Question

我试图通过一个数组过滤，并摆脱所有重复的字符串。

    NSMutableArray *initialWomensCategoryArray = [NSMutableArray new];

    for(NSArray *womensCategoryInnner in [objects valueForKey:@"womensCategory"])
    {
        for(id object in womensCategoryInnner)
        {

            [initialWomensCategoryArray addObject:object];

            womensDataArray = [[NSMutableArray alloc]init];
            for (id obj in initialWomensCategoryArray)
            {
                if (![womensDataArray containsObject:obj])
                {
                    [womensDataArray addObject: obj];
                }
            }
        }
    }

Answer 1

在将对象添加到数组中时，上面的错误想要说“您有空值”。因此，您有两种可能出现此错误

1) [initialWomensCategoryArray addObject:object]

2) [womensDataArray addObject: obj]

我认为你必须检查第一个([initialWomensCategoryArray addObject:object])