Manage Collection View height inside the Table View Cell using swift 4

Collection View height inside the Table View Cell

In Most of time we use the collection view inside the table view cell if the collection view flow is vertical then we need to increase the height of table view cell or if flow layout is horizontal then we fix some constant height for table view cell .

Here I am discussing about how to manage the table view cell height automatically if collection view flow layout is vertical

Follow the Steps:

1: Go to Table view Cell class & create the outlet of collection view & collection view Height Constraints.

class ProductTableViewCell: UITableViewCell {

@IBOutlet weak var prodcutCollectionView: UICollectionView!

@IBOutlet weak var productCollectionViewHeight: NSLayoutConstraint!

}

2: Now Register the Collection view cell so we can use .

override func awakeFromNib() {

super.awakeFromNib()

productCollectionViewHeight.constant = 20

prodcutCollectionView.register(UINib(nibName: "ProductImageCell", bundle: nil), forCellWithReuseIdentifier: "productimagecell")

prodcutCollectionView.delegate = self

prodcutCollectionView.dataSource = self

}

3: Now write their All delegate & data source method inside the table view cell class.

extension ProductTableViewCell: UICollectionViewDelegate, UICollectionViewDataSource , UICollectionViewDelegateFlowLayout{

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

return productCollectionModel.count

}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "productimagecell", for: indexPath) as! ProductImageCell

cell.layer.cornerRadius = 8

NetworkManager.sharedInstance.getImageFromUrl(imageUrl:productCollectionModel[indexPath.row].bannerImage , imageView: cell.productImage)

cell.productName.text = productCollectionModel[indexPath.row].name

cell.productPrice.text = productCollectionModel[indexPath.row].price

headerTitle.text = titles

return cell

}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {

return CGSize(width: collectionView.frame.size.width/2 - 16 , height: collectionView.frame.size.width/2 + 70)

}

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

delegate.productClick(name: productCollectionModel[indexPath.row].name, image: productCollectionModel[indexPath.row].bannerImage, id: productCollectionModel[indexPath.row].Id)

}

4: Now the Collection View delegate & data source are set , now move to Table View Delegate & Data source.

5: Now register the tableview cell

class ViewController: UIViewController ,featureViewControllerHandlerDelegate,bannerViewControllerHandlerDelegate,productViewControllerHandlerDelegate,UITabBarControllerDelegate{

@IBOutlet weak var homeTableView: UITableView!

override func viewDidLoad() {

super.viewDidLoad()

homeTableView?.register(ProductTableViewCell.nib, forCellReuseIdentifier: ProductTableViewCell.identifier)

self.homeTableView?.dataSource = self;

self.homeTableView?.delegate = self

homeTableView.rowHeight = UITableViewAutomaticDimension

self.homeTableView.estimatedRowHeight = 100

self.homeTableView.separatorColor = UIColor.clear

}

6: After register the Tableview Cell & we have to define their delegate & Data source.

extension viewController : UITableViewDelegate , UITableViewDataSource {

public func numberOfSections(in tableView: UITableView) -> Int{

return 1;

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int{

return 1

}

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {

return UITableViewAutomaticDimension

}

7: Now its Time to return the cell , here i am creating the vertical flow of collection view where the collection view height is fixed, so its automatically increase the table view cell size.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

let cell:ProductTableViewCell = tableView.dequeueReusableCell(withIdentifier: ProductTableViewCell.identifier) as! ProductTableViewCell

cell.productCollectionModel = ((item as? HomeViewModelProductItem)?.productCollectionModel)!

cell.frame = tableView.bounds

cell.layoutIfNeeded()

cell.prodcutCollectionView.reloadData()

cell.productCollectionViewHeight.constant = cell.prodcutCollectionView.collectionViewLayout.collectionViewContentSize.height

return cell;

}

8 Notes : these are the important part to automate your table view cell

cell.frame = tableView.bounds

cell.layoutIfNeeded()

cell.prodcutCollectionView.reloadData()

cell.productCollectionViewHeight.constant = cell.prodcutCollectionView.collectionViewLayout.collectionViewContentSize.height

9: Now your Table View Cell automatically increase without calculating the height of each collection view.

kunal prasad 29 December 2018

. . .

7 comments

ilham Feb 7, 2019 at 4:22 pm

any example code

kunal prasad (Moderator) Feb 11, 2019 at 1:57 pm
Hi we have already given a example code.

Reply

iBrahim Mar 29, 2019 at 3:18 pm

Hi, thanks for this helpful post. Just one problem that is when I scroll through my tableview
the first cell resize and get to long like the same size of the cell underneath it

kunal prasad (Moderator) Mar 31, 2019 at 10:32 am
Hi ,
Just replace the code where you reload the table view by this extension .

yourTableviewRefrence.reloadDataWithAutoSizingCellWorkAround()

extension UITableView {
func reloadDataWithAutoSizingCellWorkAround() {
self.reloadData()
self.setNeedsLayout()
self.layoutIfNeeded()
self.reloadData()

}
}

Reply
kunal prasad (Moderator) Jun 21, 2019 at 12:54 pm
Do this work on main thread.

Reply

srikanth Apr 16, 2019 at 5:52 pm

there is lag in table view while loading a new cell in table view
lag occurred because of reloading collection view and adding collection view height

Muhammed Eviz Dec 10, 2019 at 4:26 pm

do you have any github link for this example code because, I did not understand about “where I will write these codes” So, may i get a github link about this example project.

Manage Collection View height inside the Table View Cell using swift 4

Collection View height inside the Table View Cell

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