iOS 9 / Swift Custom Dynamic TableViewCell height

README.md

Note

This was done by dragging in a TableViewController into IB and then dragging a TableView into it. (Like any sane person would.)

I previously tried this with dragging in a ViewController then dragging a TableView onto that. Then I dragged an Object into it and assigned that Object's class as my TableViewController, then set my TableView's delegate and data source to that Object. This has always worked for me (I do this because I like to separate all of that tableView's logic out to a different file rather than having the VC's and TVC's code in the same place), but you lose viewDidLoad (it never fires, neither does viewWillAppear and the like), and we need the ever-so-necessary code below inside viewDidLoad for dynamic cell height to trigger.

	tableView.rowHeight = UITableViewAutomaticDimension
	tableView.estimatedRowHeight = 70.0
	tableView.reloadData()

Result

Here's my tableView and tableViewCell in IB:

TableView - Nothing fancy- no separator, no selection, no scroll bars

TableView - Assign data source & delegate to your TVC

TableViewCell - Assign class

TableViewCell - Assign reuse identifier

FeedTableViewCell.swift

//
//  FeedTableViewCell.swift
//  Created by Damion Nabarrete on 1/18/16.
//

import UIKit
import PureLayout


class FeedTableViewCell: UITableViewCell {

	private var hasBeenViewed: Bool!
	private var timeWrap: UIView!
	private var separatorWrap: UIView!
	private var separator: UIView!
	private var separatorWidthConstraint: NSLayoutConstraint!
	private var subtitleWrap: UIView!
	private var addEventButton: UIButton!
	var titleLabel: UILabel!
	var descriptionLabel: UILabel!
	var timeLabel: UILabel!
	var timePeriodLabel: UILabel!


	init() {
		super.init(style: UITableViewCellStyle.Default, reuseIdentifier: "FeedCell")
	}

	required init?(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
	}


	// MARK: - Cell methods

	func setAsViewed() {
		hasBeenViewed = true
		separatorWidthConstraint.constant = 1
		separator.backgroundColor = UIColor.groupTableViewBackgroundColor()
	}


	// MARK: - Setup

	private func setupViews(eventType: String) {
		hasBeenViewed = false

		timeWrap  = UIView.newAutoLayoutView()
		timeLabel = UILabel.newAutoLayoutView()
		timeLabel.textColor = UIColor.customPlaceholderColor()
		timeLabel.font = UIFont.systemFontOfSize(11)
		timeLabel.textAlignment = .Right
		timePeriodLabel = UILabel.newAutoLayoutView()
		timePeriodLabel.textColor = UIColor.customPlaceholderColor()
		timePeriodLabel.font = UIFont.systemFontOfSize(11)
		timePeriodLabel.textAlignment = .Right

		separatorWrap = UIView.newAutoLayoutView()
		separator = UIView.newAutoLayoutView()
		separator.backgroundColor = UIColor.customGreenColor()

		titleLabel = UILabel.newAutoLayoutView()
		titleLabel.preferredMaxLayoutWidth = 280
		titleLabel.numberOfLines = 0
		titleLabel.lineBreakMode = .ByWordWrapping
		titleLabel.textColor = UIColor.customTextColor()

		subtitleWrap = UIView.newAutoLayoutView()

		descriptionLabel = UILabel.newAutoLayoutView()
		descriptionLabel.preferredMaxLayoutWidth = 280
		descriptionLabel.numberOfLines = 0
		descriptionLabel.lineBreakMode = .ByWordWrapping
		descriptionLabel.font = UIFont.systemFontOfSize(11)
		descriptionLabel.textColor = UIColor.customPlaceholderColor()

  	addEventButton = UIButton.newAutoLayoutView()
		addEventButton.setTitle("+", forState: UIControlState.Normal)
		addEventButton.setTitleColor(UIColor.groupTableViewBackgroundColor(), forState: .Normal)
		if #available(iOS 8.2, *) {
	    addEventButton.titleLabel!.font = UIFont.systemFontOfSize(24, weight: UIFontWeightLight)
		} else {
	    addEventButton.titleLabel!.font = UIFont.systemFontOfSize(24)
		}
		

		var views: [String : UIView] = [
  		"timeWrap": timeWrap,
  		"titleLabel": titleLabel,
  		"descriptionLabel": descriptionLabel,
  		"separatorWrap": separatorWrap,
  		"addEventButton": addEventButton,
		]

		timeWrap.addSubview(timeLabel)
		timeWrap.addSubview(timePeriodLabel)
		separatorWrap.addSubview(separator)
		subtitleWrap.addSubview(descriptionLabel)

		for (_, view) in views {
      contentView.addSubview(view)
		}
	}

	var didSetupConstraints = false
	override func updateConstraints() {

		if !didSetupConstraints {
			let xPadding: CGFloat = 5
			let xPaddingPlus: CGFloat = 7
			let xTimeWrapWidth: CGFloat = 36
			let xTimeInset: CGFloat = 16
			let xTitleInset: CGFloat = 10

			timeWrap.autoSetDimension(.Width, toSize: xTimeWrapWidth)
			timeWrap.autoPinEdgeToSuperviewEdge(.Leading)
			timeWrap.autoPinEdgeToSuperviewEdge(.Top, withInset: xTimeInset)

			timeLabel.autoPinEdgeToSuperviewEdge(.Trailing)
			timeLabel.autoPinEdgeToSuperviewEdge(.Top)

			timePeriodLabel.autoPinEdgeToSuperviewEdge(.Trailing)
			timePeriodLabel.autoPinEdge(.Top, toEdge: .Bottom, ofView: timeLabel, withOffset: xPaddingPlus)

			separatorWrap.autoSetDimension(.Width, toSize: 2)
			separatorWrap.autoPinEdge(.Leading, toEdge: .Trailing, ofView: timeWrap, withOffset: xPaddingPlus)
			separatorWrap.autoPinEdgeToSuperviewEdge(.Top, withInset: xPadding)
			separatorWrap.autoPinEdgeToSuperviewEdge(.Bottom, withInset: xPadding)

			separatorWidthConstraint = separator.autoSetDimension(.Width, toSize: 2)
			separator.autoPinEdgeToSuperviewEdge(.Leading)
			separator.autoPinEdgeToSuperviewEdge(.Top)
			separator.autoPinEdgeToSuperviewEdge(.Bottom)

// I ended up not needing compression resistance set
//			NSLayoutConstraint.autoSetPriority(UILayoutPriorityRequired) {
//				self.titleLabel.autoSetContentCompressionResistancePriorityForAxis(.Vertical)
//				self.descriptionLabel.autoSetContentCompressionResistancePriorityForAxis(.Vertical)
//			}

			titleLabel.autoPinEdge(.Leading, toEdge: .Trailing, ofView: separatorWrap, withOffset: xPadding)
  		titleLabel.autoPinEdgeToSuperviewEdge(.Top, withInset: xTitleInset)

			descriptionLabel.autoPinEdge(.Top, toEdge: .Bottom, ofView: titleLabel, withOffset: 6)

			descriptionLabel.autoPinEdge(.Leading, toEdge: .Trailing, ofView: separatorWrap, withOffset: xPadding)
			descriptionLabel.autoPinEdgeToSuperviewEdge(.Bottom, withInset: xTitleInset)

			addEventButton.autoPinEdgeToSuperviewEdge(.Trailing)
			addEventButton.autoPinEdgeToSuperviewEdge(.Top, withInset: -2)

			didSetupConstraints = true
		}

		super.updateConstraints()
	}

}

FeedTableViewController.swift

//
//  FeedTableViewController.swift
//  Created by Damion Nabarrete on 1/18/16.
//

import UIKit


class FeedTableViewController: UITableViewController {

	override func viewDidLoad() {
		super.viewDidLoad()

		tableView.registerClass(FeedTableViewCell.self, forCellReuseIdentifier: "FeedCell")

		tableView.rowHeight = UITableViewAutomaticDimension
		tableView.estimatedRowHeight = 70.0
		tableView.reloadData()
	}

	override func viewDidAppear(animated: Bool) {
		super.viewDidAppear(animated)
		NSNotificationCenter.defaultCenter().addObserver(self, selector: "contentSizeCategoryChanged:", name: UIContentSizeCategoryDidChangeNotification, object: nil)
	}

	override func viewDidDisappear(animated: Bool) {
		super.viewDidDisappear(animated)
		NSNotificationCenter.defaultCenter().removeObserver(self, name: UIContentSizeCategoryDidChangeNotification, object: nil)
	}

	// Called when the Dynamic Type user setting changes (from the system Settings app)
	func contentSizeCategoryChanged(notification: NSNotification) {
		tableView.reloadData()
	}

	override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
		return 3
	}

	override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
		return 6
	}

	override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
		let cell = FeedTableViewCell()

		cell.timeLabel.text = "8:00"
		cell.timePeriodLabel.text = "pm"
		cell.titleLabel.text = "LIVE: Levi Panther and the Panther Party rocking all night long. In attendance: Alice Cooper along with the KISS Army!"
		cell.descriptionLabel.text = "Music: Rock, Classic Rock"

		if indexPath.row != 3 {
			NSTimer.schedule(4) { timer -> Void in
  			cell.setAsViewed()
			}
		} else {
  		cell.timeLabel.text = "10:00"
  		cell.timePeriodLabel.text = "pm"
  		cell.titleLabel.text = "Open Mic: Acoustic"
  		cell.descriptionLabel.text = "Music: Rock"
		}

    // Ensure contraints have been added
    cell.setNeedsUpdateConstraints()
    cell.updateConstraintsIfNeeded()

    return cell
	}

	override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
		let header = UIView()
		header.backgroundColor = UIColor.customTextLightColor()

		let dateFormatter = NSDateFormatter()
		dateFormatter.dateStyle  = NSDateFormatterStyle.LongStyle
		dateFormatter.dateFormat = "E MMM dd"

		let headerLabel = UILabel()
		headerLabel.translatesAutoresizingMaskIntoConstraints = false
		headerLabel.textColor = UIColor.grayColor().colorWithAlphaComponent(0.8)
		let text = section == 0
			? dateFormatter.stringFromDate(NSDate())
			: dateFormatter.stringFromDate(NSDate().dateByAddingTimeInterval(
				NSTimeInterval(60 * 60 * 24 * section)))

		let textArr = text.componentsSeparatedByString(" ")
		let weekday   = textArr[0]
		let dateMonth = textArr[1]
		let dateDay   = textArr[2]

		headerLabel.text = "\(weekday)    \(dateMonth) \(dateDay)"


		header.addSubview(headerLabel)
		// These are just old constraints I need to convert to PureLayout
		header.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat(
			"H:|-10-[headerLabel]", options: [], metrics: nil, views: ["headerLabel": headerLabel]))
		header.addConstraint(NSLayoutConstraint(
			item: headerLabel, attribute: .CenterY, relatedBy: .Equal,
			toItem: header, attribute: .CenterY, multiplier: 1, constant: 0))

		return header
	}
}

If anyone knows how to fix xcode's ugly indentation, I'd love to hear it.