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POUICollectionView Not Appearing
 

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    <p>I am trying to set up <code>UICollectionView</code> <strong>programatically</strong> in my view controller which extends <code>UIViewController</code>. For some reason, my collection view is not showing up at all. Below is what I have.</p> <p>Why is it not appearing? I am hooking it up to the delegate and data source and adding it as a subview to <code>self.view</code>. What's missing in my code?</p> <p><strong>In my <code>.h</code> file:</strong></p> <pre><code>@interface MainViewController : UIViewController { @private UICollectionView *_collectionView; NSMutableArray *_results; // data source array } @end </code></pre> <p><strong>In my <code>.m</code> file:</strong></p> <pre><code>@interface MainViewController () &lt;UICollectionViewDataSource, UICollectionViewDelegateFlowLayout&gt; @property (nonatomic, retain) UICollectionView *collectionView; @property (nonatomic, retain) NSMutableArray *results; @end @implementation MainViewController @synthesize collectionView = _collectionView; @synthesize results = _results; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // some init stuff - nothing to do with collection view. } return self; } - (void)loadView { self.results = [NSMutableArray array]; UIImage *image1 = [UIImage imageNamed:@"img1.jpg"]; UIImage *image2 = [UIImage imageNamed:@"img2.jpg"]; [self.results addObject:image1]; [self.results addObject:image2]; self.collectionView.dataSource = self; self.collectionView.delegate = self; UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init]; UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:flowLayout]; self.collectionView = collectionView; [self.view addSubview:self.collectionView]; [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"Cell"]; [self.collectionView reloadData]; } - (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section { return [self.results count]; } - (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView { return 1; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"Cell" forIndexPath:indexPath]; cell.backgroundColor = [UIColor colorWithPatternImage:[self.results objectAtIndex:indexPath.row]]; return cell; } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { UIImage *image = [self.results objectAtIndex:indexPath.row]; return CGSizeMake(image.size.width, image.size.height); } - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { return UIEdgeInsetsMake(50, 20, 50, 20); } </code></pre>
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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.

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