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)