//
// ContextViewController.swift
// Foo2
//
// Created by Jonathan Rasmusson (Contractor) on 2019-10-16.
// Copyright © 2019 Jonathan Rasmusson. All rights reserved.
//
import UIKit
class ContextViewController: UIViewController {
let menuView = UIView()
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
}
func setupViews() {
view.backgroundColor = .systemBackground
menuView.backgroundColor = .systemBlue
menuView.frame.size = .init(width: 100, height: 100)
view.addSubview(menuView)
let interaction = UIContextMenuInteraction(delegate: self)
menuView.addInteraction(interaction)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
menuView.center = view.center
}
}
extension ContextViewController: UIContextMenuInteractionDelegate {
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { suggestedActions in
// Create an action for sharing
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up")) { action in
// Show system share sheet
self.present(ShareViewController(), animated: true)
}
// Create an action for renaming
let rename = UIAction(title: "Rename", image: UIImage(systemName: "square.and.pencil")) { action in
// Perform renaming
}
// Here we specify the "destructive" attribute to show that it’s destructive in nature
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash"), attributes: .destructive) { action in
// Perform delete
}
// Create and return a UIMenu with all of the actions as children
return UIMenu(title: "", children: [share, rename, delete])
}
}
}
class ShareViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupViews()
}
func setupViews() {
view.backgroundColor = .systemRed
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.text = "Swipe down to dismiss"
view.addSubview(label)
label.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
label.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
}
}No need to explicitly register interaction. Simple create and return the menu for each cell.
import UIKit
class TableViewController: UITableViewController {
// MARK: ContextMenuDemo
static var title: String { return "Table View" }
// MARK: TableViewController
private let identifier = "identifier"
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = Self.title
tableView.allowsSelection = false
tableView.register(UITableViewCell.self, forCellReuseIdentifier: identifier)
}
// MARK: - UITableViewDelegate
/*
In a table view, there's no need to register an interaction -
this delegate method is where you create and return a menu.
*/
override func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { suggestedActions in
// Create an action for sharing
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up")) { action in
// Show system share sheet
self.present(ShareViewController(), animated: true)
}
// Create an action for renaming
let rename = UIAction(title: "Rename", image: UIImage(systemName: "square.and.pencil")) { action in
// Perform renaming
}
// Here we specify the "destructive" attribute to show that it’s destructive in nature
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash"), attributes: .destructive) { action in
// Perform delete
}
// Create and return a UIMenu with all of the actions as children
return UIMenu(title: "", children: [share, rename, delete])
}
}
// MARK: - UITableViewDataSource
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Fixtures.lorem.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
cell.textLabel?.text = Fixtures.lorem[indexPath.row]
return cell
}
}
import UIKit
/*
This view controller displays a square that can open a menu, and uses a view controller for the menu preview.
When the preview is tapped, it pushes that view controller.
*/
/// A view controller used for previewing and when an item is selected
private class MountainsPreviewViewController: UIViewController {
private let imageView = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
let mountains = UIImage(named: "tron")!
imageView.image = mountains
imageView.clipsToBounds = true
imageView.contentMode = .scaleAspectFill
imageView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(imageView)
NSLayoutConstraint.activate([
imageView.leftAnchor.constraint(equalTo: view.leftAnchor),
imageView.rightAnchor.constraint(equalTo: view.rightAnchor),
imageView.topAnchor.constraint(equalTo: view.topAnchor),
imageView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
])
// The preview will size to the preferredContentSize, which can be useful
// for displaying a preview with the dimension of an image, for example.
// Unlike peek and pop, it doesn't automatically scale down for you.
let width = view.bounds.width
let height = mountains.size.height * (width / mountains.size.width)
preferredContentSize = CGSize(width: width, height: height)
}
}
class VCPreviewSingleViewController: UIViewController, ContextMenuDemo {
// MARK: ContextMenuDemo
static var title: String { return "UIViewController (Single View)" }
// MARK: CustomPreviewController
private let photoView = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = self.title
view.backgroundColor = .systemBackground
photoView.image = UIImage(named: "tron")
photoView.contentMode = .scaleAspectFill
photoView.clipsToBounds = true
photoView.isUserInteractionEnabled = true // important!
photoView.frame.size = .init(width: 100, height: 100)
view.addSubview(photoView)
/*
Here we create an interaction, give it a delegate, and
add it to a view. This tells UIKit to call the delegate
methods when the view is long-press or 3D touched, and
display a menu if the delegate returns one.
*/
let interaction = UIContextMenuInteraction(delegate: self)
photoView.addInteraction(interaction)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
photoView.center = view.center
}
}
extension VCPreviewSingleViewController: UIContextMenuInteractionDelegate {
/*
The `previewProvider` argument needs a function
that returns a view controller. You can do this with a
closure, or pass in a method that creates the view controller
(in this case, the preview view controller initializer).
We can also implement `willPerformPreviewActionForMenuWith`
to respond to the user tapping on the preview.
*/
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, configurationForMenuAtLocation location: CGPoint) -> UIContextMenuConfiguration? {
return UIContextMenuConfiguration(identifier: nil, previewProvider: MountainsPreviewViewController.init) { suggestedActions in
return self.makeDefaultDemoMenu()
}
}
func contextMenuInteraction(_ interaction: UIContextMenuInteraction, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
// If we used a view controller for our preview, we can pull it out of the animator and show it once the commit animation is complete.
animator.addCompletion {
if let viewController = animator.previewViewController {
self.show(viewController, sender: self)
}
}
}
}
import UIKit
protocol ContextMenuDemo {
static var title: String { get }
}
extension ContextMenuDemo {
func makeDefaultDemoMenu() -> UIMenu {
// Create a UIAction for sharing
let share = UIAction(title: "Share", image: UIImage(systemName: "square.and.arrow.up")) { action in
// Show system share sheet
}
// Create an action for renaming
let rename = UIAction(title: "Rename", image: UIImage(systemName: "square.and.pencil")) { action in
// Perform renaming
}
// Here we specify the "destructive" attribute to show that it’s destructive in nature
let delete = UIAction(title: "Delete", image: UIImage(systemName: "trash"), attributes: .destructive) { action in
// Perform delete
}
// Create and return a UIMenu with all of the actions as children
return UIMenu(title: "", children: [share, rename, delete])
}
}