How to set heightForRowAt based the number of numberOfItemsInSection? - ios

Question

I'm using UITableViewController and put UICollectionView in second row in Table View Cell. The problem is how I can get heightForRowAt dynamically.
I have tried using return UITableViewAutomaticDimension. But not working.
Any help is really appreciated.
viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.estimatedRowHeight = self.tableView.rowHeight
self.tableView.rowHeight = UITableViewAutomaticDimension
}
UITableViewController
Option 1
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return self.tableView.bounds.width + 15
}
Option 2
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
Currently, I hard code the number of returns.
UICollectionViewDataSource
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 15
}
UICollectionViewDelegate, UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let layout = collectionViewLayout as! UICollectionViewFlowLayout
layout.minimumLineSpacing = 2.5
layout.minimumInteritemSpacing = 2.5
itemWidth = (collectionView.bounds.width - 5.0) / 3.0
return CGSize(width: itemWidth, height: itemWidth)
}
Here is the image of UI using return self.tableView.bounds.width + 15 :
Here is the image of UI using return UITableViewAutomaticDimension :
Here is the image of Constraints :

Answer 1

In your viewDidLoad() try adding this -:
override func viewDidLoad() {
super.viewDidLoad()
yourTableView.estimatedRowHeight = 70 // this is your storyboard default cell height
yourtableView.rowHeight = UITableViewAutomaticDimension //Automatic dimensions
}
Then try this -:
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}

Answer 2

In your case, you have to give dynamic height for your cell which has a collection view depending on the content height of your collection view, but while loading your table view that time may be your collection view would not be loaded completely thus that time your collection view's content height might not be right.
In order to get the right content height you have to calculate collection view's content height like below:
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
//Your cell which has a collectionview
if indexPath.row == 1{
let contentHeight = (numberOfCollectionViewcell*itemHeight)+collectionViewContentOffset
return contentHeight
}
return self.tableView.bounds.width + 15
}

Answer 3

From CollectionViewDelegate yon can identify when collectionview is fully loaded
get the CollectionView content height.
Send this content height to the tableView VC by creating delegate.
In delegate method reload tableView.
In tableViewCell CollectionView is already reloading so every time when you do above method compiler goes to infinity for reloading tableView and collectionView. For this you need to add a flag (isForcefullyReloadCollectionView), flag is true when tableview is tableview is need to reload otherwise false. You need to add this flag where you going to forcely reload the tableView.
Do this above, If you need further help you can ask. If I got any other solution then I update you.