Set TableView height by the number or rows - ios

Question

I have got TableView in the MainstoryBoard and the number of rows is random every time.
I want the height of the whole TableView to be flexible - by that I mean, for example: if I got 4 rows in the TableView and each TableView row height is 22 so the TableView height will be 88.
Another example:
number of rows: 2
row height = 22
TableView will be 44.
How can I make it?

Answer 1

You can change the UITableView height as per the contentSize as below:
Swift 2.2
tableView.frame = CGRectMake(tableView.frame.origin.x, tableView.frame.origin.y, tableView.frame.size.width, tableView.contentSize.height)
Swift 3 or 4+
tableView.frame = CGRect(x: tableView.frame.origin.x, y: tableView.frame.origin.y, width: tableView.frame.size.width, height: tableView.contentSize.height)
and make sure you write the above line in viewDidAppear method
You need to write the above line in viewDidLayoutSubviews also.
Swift 2.2
func viewDidLayoutSubviews(){
tableView.frame = CGRectMake(tableView.frame.origin.x, tableView.frame.origin.y, tableView.frame.size.width, tableView.contentSize.height)
tableView.reloadData()
}
Swift 3 or 4+
func viewDidLayoutSubviews(){
tableView.frame = CGRect(x: tableView.frame.origin.x, y: tableView.frame.origin.y, width: tableView.frame.size.width, height: tableView.contentSize.height)
tableView.reloadData()
}

Answer 2

Simply take outlet for tableview height constraint and update it in willDisplay cell: UITableViewCell method of UITableView
#IBOutlet weak var tblHConstraint: NSLayoutConstraint!
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
self.tblHConstraint.constant = self.tblView.contentSize.height
}

Answer 3

nothing worked here is the solution i ended up using which gives accurate height.
extension UITableView {
var contentSizeHeight: CGFloat {
var height = CGFloat(0)
for section in 0..<numberOfSections {
height = height + rectForHeader(inSection: section).height
let rows = numberOfRows(inSection: section)
for row in 0..<rows {
height = height + rectForRow(at: IndexPath(row: row, section: section)).height
}
}
return height
}
}
Usage:
tableView.contentSizeHeight
will give you the actual calculated height of your table view content.

Answer 4

Take outlet of the Height Constraint of the parent view and assign it the height of table view's content + constant(extra height of other contents in the view)
heightConstraintView.constant = tableView.contentSize.height + constantValue //use the value of constant as required.
and write this code in the cellForRowAt method.

Answer 5

To use with with autolayout:
Somewhere in viewDidLoad()
tableView.anchor(top: view.topAnchor, leading: view.leadingAnchor, bottom: nil, trailing: view.trailingAnchor)
and then in your viewDidLayoutSubViews()
tableView.heightAnchor.constraint(equalToConstant: tableView.contentSize.height).isActive = true

Answer 6

DispatchQueue.main.async {
var frame = tableView.frame
frame.size.height = tableView.contentSize.height
tableView.frame = frame
}
OR
DispatchQueue.main.async {
self.TblViewHeightConstraint.constant = CGFloat((self.array.count) * 30)//Here 30 is my cell height
self.TblView.reloadData()
}

Answer 7

Please find the below code.
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UIScreen.main.bounds.height
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let tableViewHeight = self.tableView.frame.height
let contentHeight = self.tableView.contentSize.height
let centeringInset = (tableViewHeight - contentHeight) / 2.0
let topInset = max(centeringInset, 0.0)
self.tableView.contentInset = UIEdgeInsets(top: topInset, left: 0.0, bottom: 0.0, right: 0.0)
}

Answer 8

Use this for Swift 3
override func viewDidLayoutSubviews(){
tableView.frame = CGRect(x: tableView.frame.origin.x, y: tableView.frame.origin.y, width: tableView.frame.size.width, height: tableView.contentSize.height)
tableView.reloadData()
}

Answer 9

Note: when your are increasing the tableview height it will goes out side the view. and you will get a problem with scrolling.
Ex: take a view inside that keep tableview and give constraints to left,right,bottom,top to Zero(0).
now reload the tableview assume 2 rows each row height is 20 now total rows height is 40. its fine and gave those height to table view, Table view will show only 40 height (you can assign tableview height by taking constraints (or) table view content size both are give same height according to rows height).
But if you reload 50 rows you will get scrolling problem because those rows height given to table view height, here table view height expands more than your screen height.
To solve this problem you should use scroll view outside the tableview.

Answer 10

Take outlet of tableview height and set it with your tableview row height in cellForRowAt like this,
tableviewHeight.constant = (tableView.contentSize.height * no_of_rows) + bottom_space