gistfile1.swift

import UIKit

class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
    var items: [String] = ["We", "Aenean lacinia bibendum nulla sed consectetur.", "Vestibulum id ligula porta felis euismod semper. Maecenas sed diam eget risus varius blandit sit amet non magna. Sed posuere consectetur est at lobortis. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Cras mattis consectetur purus sit amet fermentum. Etiam porta sem malesuada magna mollis euismod. Sed posuere consectetur est at lobortis. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum", "Blah", "one two three", "Donec sed odio dui. Cras justo odio, dapibus ac facilisis in, egestas eget quam.", "gum gum gum gum"]

    @IBOutlet var tableView: UITableView!
    
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.items.count
    }
    
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        var cell: TestCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as TestCell
        
        cell.labl.preferredMaxLayoutWidth = self.view.frame.width
        cell.labl.text = self.items[indexPath.row]
        
        return cell
    }
    
//    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//        println("You selected cell #\(indexPath.row)!")
//    }
    
    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        var cell: TestCell = self.tableView.dequeueReusableCellWithIdentifier("cell") as TestCell
        
        cell.labl.preferredMaxLayoutWidth = self.view.frame.width
        cell.labl.text = self.items[indexPath.row]
        
        cell.setNeedsUpdateConstraints()
        cell.updateConstraintsIfNeeded()
//        cell.bounds.width = tableView.bounds.width
        cell.setNeedsLayout()
        cell.layoutIfNeeded()
        
        let size = cell.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)
        let height = size.height
        
        println(height)
//        var height: CGFloat = cell.textLabel?.frame.height! as CGFloat
        
        return height
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
    
        tableView.estimatedRowHeight = 3.0
        tableView.rowHeight = UITableViewAutomaticDimension

        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    override func prefersStatusBarHidden() -> Bool { return true }
}

gistfile2.txt

# TestCell.swift
import UIKit

class TestCell: UITableViewCell {
    @IBOutlet weak var labl: UILabel!
    
    override init(style: UITableViewCellStyle, reuseIdentifier: String!) {
        super.init(style: style, reuseIdentifier: reuseIdentifier)
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
    
    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

}