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UITableView Header and Footer In Section

How to set the header and footer in a section.

Simple

Simplest thing you can do just to get a title in their is implement

// Simple
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    guard let vm = viewModel else { return nil }
    return vm.sections[section].title
}

Custom

If you want a custom section header you need to:

  • Create a custom section header view
final class SectionHeaderView: UITableViewHeaderFooterView {
    static let reuseIdentifier: String = String(describing: self)

    var label = UILabel()
    
    override init(reuseIdentifier: String?) {
        super.init(reuseIdentifier: reuseIdentifier)

        contentView.addSubview(label)
        
        label.translatesAutoresizingMaskIntoConstraints = false
                
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: centerXAnchor),
            label.centerYAnchor.constraint(equalTo: centerYAnchor),
        ])
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
}
  • Register it's reuse identifier


    

  • Then comment out the simple, and implement viewForHeaderISection along with the estimated and actual methods to adjust height.
    • 



extension ViewController: UITableViewDelegate {

    // Simple
//    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
//        guard let vm = viewModel else { return nil }
//        return vm.sections[section].title
//    }

    // Complex - comment out above func if you want custom
    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        guard let view = tableView.dequeueReusableHeaderFooterView(withIdentifier: SectionHeaderView.reuseIdentifier)
                as? SectionHeaderView
        else {
            return nil
        }

        guard let vm = viewModel else { return nil }
        view.label.text = vm.sections[section].title

        return view
    }
    
    // To make height variable implement these two methods
    func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        return 100
    }
    
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 60
    }
}




Getting rid of floating headers


If you don't want the headers to group and float as you scroll up try changing the styling to Grouped.




Plain


let tableView = UITableView(frame: .zero, style: .plain)




Grouped


let tableView = UITableView(frame: .zero, style: .grouped)




Group-inset


let tableView = UITableView(frame: .zero, style: .insetGrouped)




Full source


import UIKit

struct Game: Codable {
    let title: String
}

struct YearSection {
    let title: String
    let transactions: [Game]
}

class ViewController: UIViewController {

    let tableView = UITableView(frame: .zero, style: .plain)
    let cellId = "cellId"
    
    var sections: [YearSection]?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        data()
        setup()
        layout()
    }

    func data() {
        let g1 = Game(title: "Space Invaders")

        let g2 = Game(title: "Lunar Lander")
        let g22 = Game(title: "Asteroids")
        
        let g3 = Game(title: "Tempest")
        let g33 = Game(title: "Donkey Kong")
        let g333 = Game(title: "Frogger")

        let section1 = YearSection(title: "1978", transactions: [g1])
        let section2 = YearSection(title: "1979", transactions: [g2, g22])
        let section3 = YearSection(title: "1981", transactions: [g3, g33, g333])

        sections = [section1, section2, section3]
    }

    func setup() {
        tableView.delegate = self
        tableView.dataSource = self
        navigationItem.title = "History"
        
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
        tableView.register(SectionHeaderView.self,forHeaderFooterViewReuseIdentifier:SectionHeaderView.reuseIdentifier)
    }
    
    func layout() {
        tableView.translatesAutoresizingMaskIntoConstraints = false
        
        view.addSubview(tableView)
        
        NSLayoutConstraint.activate([
            tableView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor),
            tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            tableView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor),
        ])
    }
}

// MARK: UITableViewDataSource

extension ViewController: UITableViewDataSource {

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let sections = sections else { return UITableViewCell() }

        let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
        let section = indexPath.section

        let text = sections[section].transactions[indexPath.row].title
        cell.textLabel?.text = text

        return cell
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        guard let sections = sections else { return 0 }
        return sections[section].transactions.count
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        guard let sections = sections else { return 0 }
        return sections.count
    }
}

// MARK: UITableViewDataSource

extension ViewController: UITableViewDelegate {

    // Simple
//    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
//        guard let vm = viewModel else { return nil }
//        return vm.sections[section].title
//    }

    // Complex - comment out above func if you want custom
    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        guard let view = tableView.dequeueReusableHeaderFooterView(withIdentifier: SectionHeaderView.reuseIdentifier)
                as? SectionHeaderView
        else {
            return nil
        }

        guard let sections = sections else { return nil }
        view.label.text = sections[section].title

        return view
    }
    
    // To make height variable implement these two methods
    func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        return 100
    }
    
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 60
    }
}

final class SectionHeaderView: UITableViewHeaderFooterView {
    static let reuseIdentifier: String = String(describing: self)

    var label = UILabel()
    
    override init(reuseIdentifier: String?) {
        super.init(reuseIdentifier: reuseIdentifier)

        contentView.addSubview(label)
        
        label.translatesAutoresizingMaskIntoConstraints = false
                
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: centerXAnchor),
            label.centerYAnchor.constraint(equalTo: centerYAnchor),
        ])
    }

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


Same thing with nibs


Get rid of storyboards. Setup AppDelegate like you always do manually loading a hard coded ViewController.


The add a new xib file for ViewController called ViewController.xib.


Set File's Owner.




Then drag outlet's view to xib's view.




At this point your xib and view controller are connected and hooked up.


Drag out a table view into the nib. Pin it to the edges. And drag it as an outlet property into your view controller.




Design your section header


Create a new nib and class called SectionHeaderView and set your subclass as the “Custom Class” for both File’s Owner and the top-level view.




import UIKit

final class SectionHeaderView: UITableViewHeaderFooterView {
    static let reuseIdentifier: String = String(describing: self)

    static var nib: UINib {
        return UINib(nibName: String(describing: self), bundle: nil)
    }
    
}






When you drag your outlet's in be sure to make them... not File Owner. If you don't you will get key code runtime errors.






Taking care not to disrupt the output of the tableView, you can now copy in the following code and leverage your nib header view.


import UIKit

struct Game: Codable {
    let title: String
}

struct YearSection {
    let title: String
    let transactions: [Game]
}

class ViewController: UIViewController {

    let cellId = "cellId"
    var sections: [YearSection]?

    @IBOutlet var tableView: UITableView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        data()
        setup()
    }

    func data() {
        let g1 = Game(title: "Space Invaders")

        let g2 = Game(title: "Lunar Lander")
        let g22 = Game(title: "Asteroids")
        
        let g3 = Game(title: "Tempest")
        let g33 = Game(title: "Donkey Kong")
        let g333 = Game(title: "Frogger")

        let section1 = YearSection(title: "1978", transactions: [g1])
        let section2 = YearSection(title: "1979", transactions: [g2, g22])
        let section3 = YearSection(title: "1981", transactions: [g3, g33, g333])

        sections = [section1, section2, section3]
    }

    func setup() {
        tableView.delegate = self
        tableView.dataSource = self
        navigationItem.title = "History"
        
        tableView.register(UITableViewCell.self, forCellReuseIdentifier: cellId)
        tableView.register(SectionHeaderView.nib, forHeaderFooterViewReuseIdentifier:SectionHeaderView.reuseIdentifier)
    }
}

// MARK: UITableViewDataSource

extension ViewController: UITableViewDataSource {

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let sections = sections else { return UITableViewCell() }

        let cell = tableView.dequeueReusableCell(withIdentifier: cellId, for: indexPath)
        let section = indexPath.section

        let text = sections[section].transactions[indexPath.row].title
        cell.textLabel?.text = text

        return cell
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        guard let sections = sections else { return 0 }
        return sections[section].transactions.count
    }

    func numberOfSections(in tableView: UITableView) -> Int {
        guard let sections = sections else { return 0 }
        return sections.count
    }
}

// MARK: UITableViewDataSource

extension ViewController: UITableViewDelegate {

    // Complex - comment out above func if you want custom
    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        guard let view = tableView.dequeueReusableHeaderFooterView(withIdentifier: SectionHeaderView.reuseIdentifier)
                as? SectionHeaderView
        else {
            return nil
        }

        guard let sections = sections else { return nil }
        view.yearLabel.text = sections[section].title

        return view
    }
    
    // To make height variable implement these two methods
    func tableView(_ tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat {
        return 100
    }
    
    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 60
    }
}


Design your cell


Repeat the same process above for your UITableViewCell for nib.


Note: When setting color or subviews, do everything on the contentView of the cell.


contentView.backgroundColor = .systemOrange


FailedTransactionCell.swift


import UIKit

final class FailedTransactionCell: UITableViewCell {
    static let reuseIdentifier: String = String(describing: self)

    static var nib: UINib {
        return UINib(nibName: String(describing: self), bundle: nil)
    }

    @IBOutlet var titleLabel: UILabel!
    @IBOutlet var bodyLabel: UILabel!
    
    override func awakeFromNib() {
        super.awakeFromNib()
        commonInit()
    }

    private func commonInit() {
        titleLabel.textColor = .systemGray
        bodyLabel.textColor = .systemGray
    }
}


Then register and load like this:


tableView.register(FailedTransactionCell.nib, forCellReuseIdentifier: FailedTransactionCell.reuseIdentifier)

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    guard let sections = sections else { return UITableViewCell() }

    let cell = tableView.dequeueReusableCell(withIdentifier: FailedTransactionCell.reuseIdentifier, for: indexPath) as! FailedTransactionCell

    let section = indexPath.section

    let text = sections[section].transactions[indexPath.row].title
    cell.titleLabel.text = text

    return cell
}


And set your row height like this.


func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return 96
}




How to set the table view footer height


This is the trick. Reset the footer view after autolayout and reset the frame.


override func viewDidLayoutSubviews() {
  super.viewDidLayoutSubviews()
  guard let footerView = self.tableView.tableFooterView else {
    return
  }
  let width = self.tableView.bounds.size.width
  let size = footerView.systemLayoutSizeFitting(CGSize(width: width, height: UIView.layoutFittingCompressedSize.height))
  if footerView.frame.size.height != size.height {
    footerView.frame.size.height = size.height
    self.tableView.tableFooterView = footerView
  }
}


Links that help