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POUICollectionView: header view programmatically
 

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    <p>This is the way i am working on header.</p> <pre><code> // viewDidLoad [self.collectionView registerClass:[UICollectionViewCell class]forCellWithReuseIdentifier:@"Cell"]; [self.collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header"]; UICollectionViewFlowLayout *layout= [[UICollectionViewFlowLayout alloc]init]; self.collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, 390, 300) collectionViewLayout:layout]; layout.collectionView.backgroundColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:230.0/255.0 alpha:1.0]; [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"]; self.collectionView.delegate=self; self.collectionView.dataSource=self; layout.minimumInteritemSpacing = 15; [layout setScrollDirection:UICollectionViewScrollDirectionVertical]; self.collectionView.collectionViewLayout = layout; self.collectionView.showsHorizontalScrollIndicator = NO; self.collectionView.showsVerticalScrollIndicator = NO; [self.collectionView setBounces:YES]; self.collectionView.allowsMultipleSelection = YES; [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"HorizontalPickerCell"]; [self.view addSubview:self.collectionView]; - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section { if (section == 0) { return CGSizeMake(0, kHeaderHeight); } return CGSizeMake(0, kHeaderHeight + kInterSectionMargin); } - (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView { NSLog(@"levels count:%d", [arrLevels count]); return [arrLevels count]; } - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { NSLog(@"vals count:%d", [arrSeats count]); for(int i=0; i&lt;[arrLevels count]; i++) { if(section == i) { int c; NSString *cnt = [NSString stringWithFormat:@"%@",[arrTot objectAtIndex:i]]; c = [cnt intValue]; return c; } } return 1; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath]; //cell.selectedBackgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"blue_s.png"]]; if (cell.selected) { [UIColor colorWithPatternImage:[UIImage imageNamed:@"blue_s.png"]]; // highlight selection } else { cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"yellow_seat.png"]]; // Default color } return cell; } - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { return UIEdgeInsetsMake(10, 12, 10, 10); } - (CGSize)collectionView:(UICollectionView *)collectionView layout: (UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { CGSize retval = CGSizeMake(22, 20); return retval; } - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { UICollectionReusableView *reusableview = nil; if (kind == UICollectionElementKindSectionHeader) { UICollectionReusableView *headerView = [self.collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:nil forIndexPath:indexPath]; self.lblHeader = [[UILabel alloc]initWithFrame:CGRectMake(120, 10, 100, 30)]; self.lblHeader.backgroundColor = [UIColor whiteColor]; self.lblHeader.textColor = [UIColor redColor]; self.lblHeader.text = @"Level 1"; [self.collectionView addSubview:self.lblHeader]; } return reusableview; } - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { printf("Selected View index=%d",indexPath.row); itemPaths = [self.collectionView indexPathsForSelectedItems]; UICollectionViewCell* cell=[self.collectionView cellForItemAtIndexPath:indexPath]; cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"blue_s.png"]]; } - (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell* cell=[self.collectionView cellForItemAtIndexPath:indexPath]; cell.contentView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"yellow_seat.png"]]; } </code></pre>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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