How to create dynamic self-sizing height UITableViewCell in swift? - swift

Question

Hey I have a tableview controller and I want to create dynamic cell height with label and ImageViews. I tried something like below but it doesn't work for me. Where is the mistake about code. Any idea ?
class NotificationsPageController: UITableViewController{
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(NotificationCell.self, forCellReuseIdentifier: notCell)
view.backgroundColor = .black
tableView.estimatedRowHeight = 60
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableView.automaticDimension
}
override func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 60
}
class NotificationCell: UITableViewCell {
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
backgroundColor = UIColor(red: 18/255, green: 18/255, blue: 18/255, alpha: 1)
setNotificationAnchors()
}
fileprivate func setNotificationAnchors() {
addSubview(notiType)
notiType.anchor(top: topAnchor, left: leftAnchor, bottom: nil, right: rightAnchor, paddingTop: 4, paddingLeft: 6, paddingBottom: 0, paddingRight: 20, width: 0, height: 0)
//notiType.centerYAnchor.constraint(equalTo: notiImage.centerYAnchor).isActive = true
addSubview(notiImage)
notiImage.anchor(top: nil, left: nil, bottom: nil, right: rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 4, width: 0, height: 0)
notiImage.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}

Answer 1

First, I strongly recommend you learn how constraints and auto-layout work. The fact that the code you posted shows you are using a .anchor(top:left:bottom:right:...) type of "constraint helper" indicates that you don't understand it yet.
So, here is a simple example. Note that this is not a complete implementation, but it should get you headed in the right direction:
class NotificationCell: UITableViewCell {
let notiType: UILabel = {
let v = UILabel()
v.translatesAutoresizingMaskIntoConstraints = false
v.numberOfLines = 0
return v
}()
let notiImage: UIImageView = {
let v = UIImageView()
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
backgroundColor = UIColor(red: 18/255, green: 18/255, blue: 18/255, alpha: 1)
setNotificationAnchors()
}
fileprivate func setNotificationAnchors() {
contentView.addSubview(notiType)
contentView.addSubview(notiImage)
let g = contentView.layoutMarginsGuide
NSLayoutConstraint.activate([
// constrain label Top, Leading, Bottom to contentView margins
notiType.topAnchor.constraint(equalTo: g.topAnchor, constant: 0.0),
notiType.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 0.0),
notiType.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: 0.0),
// constrain image view Right and centerY to contentView margins
notiImage.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: 0.0),
notiImage.centerYAnchor.constraint(equalTo: g.centerYAnchor, constant: 0.0),
// guessing square (1:1 ratio) image view, 24 x 24
notiImage.widthAnchor.constraint(equalToConstant: 24.0),
notiImage.heightAnchor.constraint(equalTo: notiImage.widthAnchor),
// leave 8-pts space between label and image view
notiType.trailingAnchor.constraint(equalTo: notiImage.leadingAnchor, constant: -8.0),
])
// during development, so we can easily see the element frames
notiType.backgroundColor = .cyan
notiImage.backgroundColor = .red
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class ExampleTableViewController: UITableViewController {
let notCell = "notCell"
let theData: [String] = [
"Single line label.",
"This lable will have enough text that it will need to wrap onto multiple lines.",
"Another single line cell.",
"Here is a description of a table view cell: Defines the attributes and behavior of cells in a table view. You can set a table cell's selected-state appearance, support editing functionality, display accessory views (such as a switch control), and specify background appearance and content indentation.",
"This is the fifth row.",
]
override func viewDidLoad() {
super.viewDidLoad()
tableView.register(NotificationCell.self, forCellReuseIdentifier: notCell)
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return theData.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: notCell, for: indexPath) as! NotificationCell
cell.notiType.text = theData[indexPath.row]
// set image here...
//cell.notiImage.image = ...
return cell
}
}
Result - Multi-line label (cyan background) and 24x24 image (red background):
By the way... Step-by-step tutorials on this can be found in many, many places - a little tough to think you searched and couldn't find anything like this.

Answer 2

Follow the steps below:
Add the below lines in ViewDidLoad
tableView.dataSource = self
tableView.delegate = self
// Set automatic dimensions for row height
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = UITableViewAutomaticDimension
In XIB or Cell if you have label update the numberOLines = 0 and make the lineBreakMode = truncateTail
Update constraints to top, bottom, right and left to its superView