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update playground for Swift 5 and Xcode 12 #3

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22 changes: 11 additions & 11 deletions ...ew Controllers.playground/Pages/Container View Controller.xcplaygroundpage/Contents.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -6,16 +6,16 @@

import UIKit

let url = NSURL(string: "http://localhost:8000/episode.json")!
let url = URL(string: "http://localhost:8000/episode.json")!
let episodeResource = Resource<Episode>(url: url, parseJSON: { anyObject in
(anyObject as? JSONDictionary).flatMap(Episode.init)
})


final class LoadingViewController: UIViewController {
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
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@azarovalex azarovalex Nov 28, 2020 •
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.Gray style is now deprecated in favor of .medium

let spinner = UIActivityIndicatorView(style: .medium)

init<A>(load: ((Result<A>) -> ()) -> (), build: (A) -> UIViewController) {
init<A>(load: (@escaping (Result<A>) -> ()) -> (), build: @escaping (A) -> UIViewController) {
super.init(nibName: nil, bundle: nil)
spinner.startAnimating()
load() { [weak self] result in
Expand All @@ -28,7 +28,7 @@ final class LoadingViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .whiteColor()
view.backgroundColor = .white
spinner.hidesWhenStopped = true
spinner.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(spinner)
Expand All @@ -39,12 +39,12 @@ final class LoadingViewController: UIViewController {
fatalError("init(coder:) has not been implemented")
}

func add(content content: UIViewController) {
addChildViewController(content)
func add(content: UIViewController) {
addChild(content)
view.addSubview(content.view)
content.view.translatesAutoresizingMaskIntoConstraints = false
content.view.constrainEdges(toMarginOf: view)
content.didMoveToParentViewController(self)
content.didMove(toParent: self)
}
}

Expand All @@ -58,7 +58,7 @@ final class EpisodeDetailViewController: UIViewController {
}

override func viewDidLoad() {
view.backgroundColor = .whiteColor()
view.backgroundColor = .white

view.addSubview(titleLabel)
titleLabel.translatesAutoresizingMaskIntoConstraints = false
Expand All @@ -70,11 +70,11 @@ final class EpisodeDetailViewController: UIViewController {
let sharedWebservice = Webservice()

let episodesVC = LoadingViewController(load: { callback in
sharedWebservice.load(episodeResource, completion: callback)
sharedWebservice.load(resource: episodeResource, completion: callback)
}, build: EpisodeDetailViewController.init)

episodesVC.view.frame = CGRect(x: 0, y: 0, width: 250, height: 300)


import XCPlayground
XCPlaygroundPage.currentPage.liveView = episodesVC
import PlaygroundSupport
PlaygroundPage.current.liveView = episodesVC
18 changes: 9 additions & 9 deletions Loading View Controllers.playground/Pages/Protocol.xcplaygroundpage/Contents.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

import UIKit

let url = NSURL(string: "http://localhost:8000/episode.json")!
let url = URL(string: "http://localhost:8000/episode.json")!
let episodeResource = Resource<Episode>(url: url, parseJSON: { anyObject in
(anyObject as? JSONDictionary).flatMap(Episode.init)
})
Expand All @@ -24,27 +24,27 @@ protocol Loading {
extension Loading where Self: UIViewController {
func load(resource: Resource<ResourceType>) {
spinner.startAnimating()
sharedWebservice.load(resource) { [weak self] result in
sharedWebservice.load(resource: resource) { [weak self] result in
self?.spinner.stopAnimating()
guard let value = result.value else { return } // TODO loading error
self?.configure(value)
self?.configure(value: value)
}
}
}


final class EpisodeDetailViewController: UIViewController, Loading {
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
let spinner = UIActivityIndicatorView(style: .medium)
let titleLabel = UILabel()

convenience init(episode: Episode) {
self.init()
configure(episode)
configure(value: episode)
}

convenience init(resource: Resource<Episode>) {
self.init()
load(resource)
load(resource: resource)
}

func configure(value: Episode) {
Expand All @@ -53,7 +53,7 @@ final class EpisodeDetailViewController: UIViewController, Loading {

override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .whiteColor()
view.backgroundColor = .white

spinner.hidesWhenStopped = true
spinner.translatesAutoresizingMaskIntoConstraints = false
Expand All @@ -71,5 +71,5 @@ let episodesVC = EpisodeDetailViewController(resource: episodeResource)
episodesVC.view.frame = CGRect(x: 0, y: 0, width: 250, height: 300)


import XCPlayground
XCPlaygroundPage.currentPage.liveView = episodesVC
import PlaygroundSupport
PlaygroundPage.current.liveView = episodesVC
12 changes: 6 additions & 6 deletions Loading View Controllers.playground/Pages/Starting Point.xcplaygroundpage/Contents.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@

import UIKit

let url = NSURL(string: "http://localhost:8000/episode.json")!
let url = URL(string: "http://localhost:8000/episode.json")!
let episodeResource = Resource<Episode>(url: url, parseJSON: { anyObject in
(anyObject as? JSONDictionary).flatMap(Episode.init)
})
Expand All @@ -16,7 +16,7 @@ let sharedWebservice = Webservice()


final class EpisodeDetailViewController: UIViewController {
let spinner = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
let spinner = UIActivityIndicatorView(style: .medium)
let titleLabel = UILabel()

convenience init(episode: Episode) {
Expand All @@ -27,7 +27,7 @@ final class EpisodeDetailViewController: UIViewController {
convenience init(resource: Resource<Episode>) {
self.init()
spinner.startAnimating()
sharedWebservice.load(resource) { [weak self] result in
sharedWebservice.load(resource: resource) { [weak self] result in
self?.spinner.stopAnimating()
guard let value = result.value else { return } // TODO loading error
self?.titleLabel.text = value.title
Expand All @@ -36,7 +36,7 @@ final class EpisodeDetailViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .whiteColor()
view.backgroundColor = .white

spinner.hidesWhenStopped = true
spinner.translatesAutoresizingMaskIntoConstraints = false
Expand All @@ -54,5 +54,5 @@ let episodesVC = EpisodeDetailViewController(resource: episodeResource)
episodesVC.view.frame = CGRect(x: 0, y: 0, width: 250, height: 300)


import XCPlayground
XCPlaygroundPage.currentPage.liveView = episodesVC
import PlaygroundSupport
PlaygroundPage.current.liveView = episodesVC
55 changes: 37 additions & 18 deletions Loading View Controllers.playground/Sources/Helpers.swift
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Original file line number Diff line number Diff line change
@@ -1,38 +1,57 @@
import UIKit

extension UIView {
public func constrainEqual(attribute: NSLayoutAttribute, to: AnyObject, multiplier: CGFloat = 1, constant: CGFloat = 0) {
constrainEqual(attribute, to: to, attribute, multiplier: multiplier, constant: constant)
public func constrainEqual(
attribute: NSLayoutConstraint.Attribute,
to: AnyObject,
multiplier: CGFloat = 1,
constant: CGFloat = 0
) {
constrainEqual(attribute: attribute, to: to, attribute, multiplier: multiplier, constant: constant)
}

public func constrainEqual(attribute: NSLayoutAttribute, to: AnyObject, _ toAttribute: NSLayoutAttribute, multiplier: CGFloat = 1, constant: CGFloat = 0) {
NSLayoutConstraint.activateConstraints([
NSLayoutConstraint(item: self, attribute: attribute, relatedBy: .Equal, toItem: to, attribute: toAttribute, multiplier: multiplier, constant: constant)
]
)
public func constrainEqual(
attribute: NSLayoutConstraint.Attribute,
to: AnyObject,
_ toAttribute: NSLayoutConstraint.Attribute,
multiplier: CGFloat = 1,
constant: CGFloat = 0
) {
NSLayoutConstraint.activate([
NSLayoutConstraint(
item: self,
attribute: attribute,
relatedBy: .equal,
toItem: to,
attribute: toAttribute,
multiplier: multiplier,
constant: constant
)
])
}

public func constrainEdges(toMarginOf view: UIView) {
constrainEqual(.Top, to: view, .TopMargin)
constrainEqual(.Leading, to: view, .LeadingMargin)
constrainEqual(.Trailing, to: view, .TrailingMargin)
constrainEqual(.Bottom, to: view, .BottomMargin)
constrainEqual(attribute: .top, to: view, .topMargin)
constrainEqual(attribute: .leading, to: view, .leadingMargin)
constrainEqual(attribute: .trailing, to: view, .trailingMargin)
constrainEqual(attribute: .bottom, to: view, .bottomMargin)
}

public func center(inView view: UIView) {
centerXAnchor.constrainEqual(view.centerXAnchor)
centerYAnchor.constrainEqual(view.centerYAnchor)
centerXAnchor.constrainEqual(anchor: view.centerXAnchor)
centerYAnchor.constrainEqual(anchor: view.centerYAnchor)
}
}

extension NSLayoutAnchor {
public func constrainEqual(anchor: NSLayoutAnchor, constant: CGFloat = 0) {
let constraint = constraintEqualToAnchor(anchor, constant: constant)
constraint.active = true
@objc public func constrainEqual(anchor: NSLayoutAnchor, constant: CGFloat = 0) {
constraint(equalTo: anchor, constant: constant).isActive = true
}
}


public func mainQueue(block: () -> ()) {
dispatch_async(dispatch_get_main_queue(), block)
public func mainQueue(block: @escaping () -> ()) {
DispatchQueue.main.async {
block()
}
}
20 changes: 10 additions & 10 deletions Loading View Controllers.playground/Sources/Networking.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@ public typealias JSONDictionary = [String: AnyObject]
extension Episode {
public init?(json: JSONDictionary) {
guard let id = json["id"] as? String,
title = json["title"] as? String else { return nil }
let title = json["title"] as? String else { return nil }

self.id = id
self.title = title
Expand All @@ -26,15 +26,15 @@ extension Episode {


public struct Resource<A> {
public var url: NSURL
public var parse: NSData -> A?
public var url: URL
public var parse: (Data) -> A?
}

extension Resource {
public init(url: NSURL, parseJSON: AnyObject -> A?) {
public init(url: URL, parseJSON: @escaping (Any) -> A?) {
self.url = url
self.parse = { data in
let json = try? NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions())
let json = try? JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions())
return json.flatMap(parseJSON)
}
}
Expand All @@ -43,11 +43,11 @@ extension Resource {

public enum Result<A> {
case success(A)
case error(ErrorType)
case error(Error)
}

extension Result {
public init(_ value: A?, or error: ErrorType) {
public init(_ value: A?, or error: Error) {
if let value = value {
self = .success(value)
} else {
Expand All @@ -62,7 +62,7 @@ extension Result {
}


public enum WebserviceError: ErrorType {
public enum WebserviceError: Error {
case other
}

Expand All @@ -71,8 +71,8 @@ public final class Webservice {
public init() { }

/// Loads a resource. The completion handler is always called on the main queue.
public func load<A>(resource: Resource<A>, completion: Result<A> -> ()) {
NSURLSession.sharedSession().dataTaskWithURL(resource.url) { data, response, _ in
public func load<A>(resource: Resource<A>, completion: @escaping (Result<A>) -> ()) {
URLSession.shared.dataTask(with: resource.url) { data, response, _ in
let parsed = data.flatMap(resource.parse)
let result = Result(parsed, or: WebserviceError.other)
mainQueue { completion(result) }
Expand Down