UICollectionView 数据库元素分组 多种section分开显示

第一遍 复杂方法 ： 数据库查询一个表中userID 然后进行分类 中间去重 获得ID个数  放到section 中  显示 

#pragma mark -  查询不同的ID 各数 

- (void)checkIDsWithCount{

    

    RLMRealm * realm = [[RealmConfigurationshared]realm];

//    RLMResults * selectIDResults = [[CarVideoInfoObj objectsInRealm:realm where:@"userID !=0"] sortedResultsUsingKeyPath:@"hostID" ascending:NO];

    RLMResults * selectIDResults = [[CarVideoInfoObj  allObjectsInRealm:realm] sortedResultsUsingKeyPath:@"hostID"ascending:NO];

    NSLog(@"selectIDResults  is  %@",selectIDResults);

    

    NSMutableArray *userID = [NSMutableArrayarray];

    allSectionDic = [NSMutableDictionarynew];

    for(CarVideoInfoObj  * obj in selectIDResults){

        NSInteger userId = obj.userID;

        NSNumber * key = @(userId);

        NSMutableArray  * objects = [allSectionDicobjectForKey:key];

        if(objects == nil){

                objects = [NSMutableArraynew];

                [allSectionDicsetObject:objects forKey:key];

        }

        [objects  addObject:obj];

//        NSLog(@"objectID==== %ld",(long)userId);

//        [userID addObject:@(userId)];

    }

    NSLog(@"all carVideoInfo object list is %@",allSectionDic);

    // 去重查询个数

    NSLog(@"%lu",(unsignedlong)allSectionDic.count);

     //统计数组相同元素的个数

    sectionDic = [[NSMutableDictionaryalloc] init];

    set = [NSSetsetWithArray:userID];

    for (NSString *setString  inset){

        //需要去掉的元素数组

        NSMutableArray *filteredArray = [[NSMutableArrayalloc]initWithObjects:setString, nil];

        NSMutableArray *dataArray = userID;

        NSPredicate * filterPredicate = [NSPredicatepredicateWithFormat:@"NOT (SELF IN %@)",filteredArray];

        //过滤数组

        NSArray * reslutFilteredArray = [dataArray filteredArrayUsingPredicate:filterPredicate];

        NSLog(@"Reslut Filtered Array = %@",reslutFilteredArray);

        int number = (int)(dataArray.count-reslutFilteredArray.count);

        NSLog(@"number :%d",number);

        [sectionDicsetObject:[NSStringstringWithFormat:@"%d",number] forKey:setString];

    }

    NSLog(@"dic  is%@", sectionDic);

        _userIDdic = [[NSDictionaryalloc]init];

        _userIDdic = sectionDic;

    

        NSArray * keys = [_userIDdicallKeys] ;

       dicArray =[NSArrayarray];

        dicArray = keys;

}

 

#pragma mark - UICollectionView delegate dataSource

#pragma mark 定义展示的Section的个数

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

    // section  个数

       returnset.count;

}

#pragma mark 定义展示的UICollectionViewCell的个数

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

//    sectionDic  is{

//        10006 = 14;

//        10003 = 23;

//    }

    NSString *key = [dicArrayobjectAtIndex:section];

    NSString * count = [_userIDdicobjectForKey:key];

    return count.integerValue;

    

//        return 2;

    //    NSLog(@"2222_videoMode%@",self.videoMode);

    //    NSLog(@"_videoMode.videos count  is   %lu",(unsigned long)[self.videoMode.carVideoInfoObjArray count]);

    //    return [self.videoMode.carVideoInfoObjArray count];

    

}

 第二种方法  查询表格  讲userID 设置为字典的key 不进获取到了以userID不同的个数作为 section 而且每个 userI获取了每个userID的数据  为赋值显示 打好了基础 (仍不完善)

#pragma mark -  查询不同的ID 各数 

- (void)checkIDsWithCount{

    

    RLMRealm * realm = [[RealmConfigurationshared]realm];

    RLMResults * selectIDResults = [[CarVideoInfoObj  allObjectsInRealm:realm] sortedResultsUsingKeyPath:@"hostID"ascending:NO];

    NSLog(@"selectIDResults  is  %@",selectIDResults);

    allSectionDic = [NSMutableDictionarynew];

    for(CarVideoInfoObj  * obj in selectIDResults){

        NSInteger userId = obj.userID;

        NSNumber * key = @(userId);

        NSMutableArray  * objects = [allSectionDicobjectForKey:key];

        if(objects == nil){

                objects = [NSMutableArraynew];

                [allSectionDicsetObject:objects forKey:key];

        }

        [objects  addObject:obj];

    }

    NSLog(@"all carVideoInfo object list is %@",allSectionDic);

    _userIDdic = [[NSDictionaryalloc]init];

    _userIDdic = allSectionDic;

    NSArray * keys = [_userIDdicallKeys] ;

    dicArray =[NSArrayarray];

    dicArray = keys;

}

#pragma mark - UICollectionView delegate dataSource

#pragma mark 定义展示的Section的个数

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

    // section  个数

       returnallSectionDic.count;

}

#pragma mark 定义展示的UICollectionViewCell的个数

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

    NSString *key = [dicArrayobjectAtIndex:section];

//    NSString * count = [_userIDdic objectForKey:key];

    

    return [[_userIDdicobjectForKey:key] count];

}

 

 第三种： 完善后的方法 及赋值