Cannot Set Dynamic TableView Row Height-CodePudding

I'm trying to set dynamic row height in TableView. But unfortunately is not working.

The only thing is working is to set the heightForRowAt indexPath to a constant number.

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 470 //or any other number
}

If I delete this function, or try to set it to automatic the cell will not show at all. Something like this:

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableView.automaticDimension
}

I also tried to use:

self.tableView.estimatedRowHeight = UITableView.automaticDimension //Tried even with a number
self.tableView.rowHeight = UITableView.automaticDimension

But seems nothing to work besides using a constant height in heightForRowAt indexPath function. Which is not what I want, I want cell to be expanded based on content inside the cell.

I also tried to set height in heightForRowAt indexPath function to automatic but set a fixed height on constraints in the content of the cell xib file, still same (I did just to see what happens). So seems, something is wrong around this function.

Note: My TableView and UITableViewCell are divided in a storyboard and a xib files.

CodePudding user response：

If you want to set the dynamic tableview row height, you must use autolayout.

Please set the constraint on the UI components in the cell as shown in the image below.

I used UILabel as sample code. For UILabel, be sure to set Lines to 0.

Here is the sample code

class ViewController: UIViewController {
    
    let stringArr = ["aaaaaaaaaaaaaaaaaa", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"]
    
    @IBOutlet weak var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tableView.dataSource = self
        
        tableView.estimatedRowHeight = 100
        tableView.rowHeight = UITableView.automaticDimension
    }
}

extension ViewController: UITableViewDataSource {
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return stringArr.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(withIdentifier: "TestCell", for: indexPath) as? TestCell else {
            return UITableViewCell()
        }
        
        cell.label.text = stringArr[indexPath.row]
        
        return cell
    }
}

You need to register the cell in the tableview.

tableView.register(UINib(nibName: “YourCellNibName”, bundle: nil), forCellReuseIdentifier: “YourCellReuseIdentifier”)