问UIcollectionview没有显示data.The、numberOfItemsInSection和cellForItemAtIndexPath方法，是不是firing.How可以在标签上显示数据？

EN

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return  departureTimesArray.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
    User *user = [departureTimesArray objectAtIndex:indexPath.row];
    UILabel *label = (UILabel*)[cell.contentView viewWithTag:100];
    if (!label)
    {
        label = [[UILabel alloc] initWithFrame:CGRectMake(12.0, 90.0,90.0, 30.0)];
       label.textColor = [UIColor redColor];
        label.backgroundColor = [UIColor clearColor];
        label.font = [UIFont boldSystemFontOfSize:16];
        label.textColor = [UIColor colorWithRed:46.0/255.0 green:63.0/255.0 blue:81.0/255.0 alpha:1.0];
        label.tag = 100;

        [cell.contentView addSubview:label];
    }
    //    label.text=user.departureTime_Bus;
    label.text = [NSString stringWithFormat:@"%@",user.departureTime_Bus];

    return cell;
}

-(void)repaint:(NSMutableArray *)retrievedData
{
    if (retrievedData.count > 0)
    {
        NSLog(@"%@is the value",retrievedData);
        userObj = [retrievedData objectAtIndex:0];

        [departureTimesArray addObjectsFromArray:retrievedData];
        [mycollectionView reloadItemsAtIndexPaths:departureTimesArray];
    }
}