一、無序去重

這個(gè)很簡單了，如果對排序無所謂只想去重的話，這個(gè)方法很簡便實(shí)用

//無序去重
    NSMutableArray *resultArray = [[NSMutableArray alloc] init];
    NSMutableDictionary *mutableDic = [NSMutableDictionary dictionary];
    for (UserInfo *info in self.dataArray) {
        [mutableDic setObject:info forKey:info.userid];
    }
    resultArray = [NSMutableArray arrayWithArray:[mutableDic allValues]];

二、有序去重

一個(gè)for循環(huán)解決這個(gè)問題，能用一個(gè)for循環(huán)搞定的堅(jiān)決不用兩個(gè)

//有序去重
    NSMutableArray *ids = [[NSMutableArray alloc] init];
    NSMutableArray *resultArray = [[NSMutableArray alloc] init];
    for (UserInfo *info in self.dataArray) {
        if (info.userid.length && ![ids containsObject:info.userid]) {
            [ids addObject:info.userid];
            [resultArray addObject:info];
        }
    }

讓人不經(jīng)意的小細(xì)節(jié)