IOS UICollectionView pure code, no xib

IOS UICollectionView pure code, no xib
//

1)You must use the following method to register the Cell class:

// -(Void) registerClass: forCellWithReuseIdentifiEr:

// -(Void) registerClass: forSupplementaryViewOfKiNd: withReuseIdentifier:

// -(Void) registerNib: forCellWithReuseIdentifiEr:

// -(Void) registerNib: forSupplementaryViewOfKiNd: withReuseIdentifier:

-(Void) viewDidLoad

{

// Initialization

UICollectionViewFlowLayoUt * flowLayout = [[UICollectionViewFlowLayoUtalloc] init];

[FlowLayout setScrollDirection: UICollectionViewScrollDiRectionVertical];

Self. collectionView = [[UICollectionViewalloc] initWithFrame: CGRectMake (0, kNavHeight, kDeviceWidth, kDeviceHeight-kNavHeight * 2-ktabbarheight20) collectionViewLayout: flowLayout];

// Register

[Self. collectionView registerClass: [VideoCell class] forCellWithReuseIdentifiEr: @ "cell"];

// Set proxy

Self. collectionView. delegate = self;

Self. collectionView. dataSource = self;

[Self. view addSubview: self. collectionView];

}

# Pragma mark-collectionView delegate

// Set partitions

-(NSInteger) numberOfSectionsInCollecTionView :( UICollectionView *) collectionView

{

Return 1;

}

// Number of elements in each partition

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

{

Return 24;

}

// Set the Element Content

-(UICollectionViewCell *) collectionView :( UICollectionView *) collectionView cellForItemAtIndexPath :( NSIndexPath *) indexPath

{

Static NSString * identify = @ "cell ";

VideoCell * cell = [collectionView dequeueReusableCellWithREuseIdentifier: identify forIndexPath: indexPath];

[Cell sizeToFit];

If (! Cell ){

}

VideoModel * model = [self. videoModels objectAtIndex: indexPath. row];

NSURL * url = [NSURL URLWithString: model. videoImgURL];

[Cell. imgView setImageWithURL: url];

Cell. titleLbale. text = model. videoTitle;

Return cell;

}

// Set the element size box

-(UIEdgeInsets) collectionView :( UICollectionView *) collectionView layout :( UICollectionViewLayout *) collectionViewLayout insetForSectionAtIndex :( NSInteger) section

{

UIEdgeInsets top = {5, 10, 15, 5 };

Return top;

}

// Set the top size

-(CGSize) collectionView :( UICollectionView *) collectionView layout :( UICollectionViewLayout *) collectionViewLayout referenceSizeForHeaderInSection :( NSInteger) section

{

CGSize size = {0, 0 };

Return size;

}

// Set the element size

-(CGSize) collectionView :( UICollectionView *) collectionView layout :( UICollectionViewLayout *) collectionViewLayout sizeForItemAtIndexPath :( NSIndexPath *) indexPath

{

Return CGSizeMake (240, (kDeviceHeight-kNavHeight * 2-ktabbarheight20)/4.0 );

}

// Click an element to trigger the event

-(Void) collectionView :( UICollectionView *) collectionView didSelectItemAtIndexPath:( NSIndexPath *) indexPath

{

NSLog (@ "% @", indexPath );

DetailVideoViewControlleR * detailVC = [[DetailVideoViewControlleRalloc] init];

[Self. navigationController pushViewController: detailVCanimated: YES];

}