Swift

Issue #518 let userDefaults = UserDefaults(suiteName: suiteName) userDefaults.removePersistentDomain(forName: suiteName) https://developer.apple.com/documentation/foundation/userdefaults/1417339-removepersistentdomain Calling this method is equivalent to initializing a user defaults object with init(suiteName:) passing domainName, and calling the removeObject(forKey:) method on each of its keys. Read more https://www.swiftbysundell.com/articles/the-power-of-userdefaults-in-swift/ http://dscoder.com/defaults.html https://medium.com/swift-india/userdefaults-under-the-hood-457461c8d262

Issue #510 Use Dictionary(grouping:by:) func groups(countries: [Country]) -> [Group] { let dictionary = Dictionary(grouping: countries, by: { String($0.name.prefix(1)) }) let groups = dictionary .map({ (key: String, value: [Country]) -> Group in return Group(initial: key, countries: value) }) .sorted(by: { $0.initial < $1.initial }) return groups }

Issue #506 When a function expects AnyPublisher<[Book], Error> but in mock, we have Just func getBooks() -> AnyPublisher<[Book], Error> { return Just([ Book(id: "1", name: "Book 1"), Book(id: "2", name: "Book 2"), ]) .eraseToAnyPublisher() } There will be a mismatch, hence compile error Cannot convert return expression of type ‘AnyPublisher<[Book], Just.Failure>’ (aka ‘AnyPublisher<Array, Never>’) to return type ‘AnyPublisher<[Book], Error>’ The reason is because Just produces Never, not Error. The workaround is to introduce Error...

Issue #504 https://twitter.com/NeoNacho/status/1181245484867801088?s=20 There’s no way to have platform specific sources or targets today, so you’ll have to take a different approach. I would recommend wrapping all OS specific files in #if os and just having one target. For tests, you could do something similar, one test target, but conditional tests Every files are in Sources folder, so we can use platform and version checks. For example Omnia is a Swift Package Manager that supports iOS, tvOS, watchOS, macOS and Catalyst....

Issue #501 Use Catalyst Add to CocoaPods platform :ios, '13.0' target 'MyApp' do use_frameworks! pod 'FirebaseCore' pod 'Firebase/Firestore' end Troubleshooting Select a team for gRPC-C++-gRPCCertificates-Cpp FIRAnalyticsConnector: building for Mac Catalyst, but linking in object file built for iOS Simulator https://stackoverflow.com/questions/57666155/firanalyticsconnector-building-for-mac-catalyst-but-linking-in-object-file-bui The problem was related to the difference between Firebase/Core and FirebaseCore. The first is a subspec of the Firebase pod that depends on FirebaseAnalytics. The second is only the FirebaseCore pod....

Issue #493 Declare in Podfile pod 'Firebase/Core' pod 'Firebase/RemoteConfig' Use RemoteConfigHandler to encapsulate logic. We introduce Key with CaseIterable and defaultValue of type NSNumber to manage default values. import Firebase import FirebaseRemoteConfig final class RemoteConfigHandler { let remoteConfig: RemoteConfig enum Key: String, CaseIterable { case interval = "fetch_interval" var defaultValue: NSNumber { switch self { case .periodicGetSalons: return NSNumber(value: 300) } } } init() { self.remoteConfig = RemoteConfig.remoteConfig() let settings = RemoteConfigSettings() settings....

Issue #485 The easiest way to show image picker in iOS is to use UIImagePickerController, and we can bridge that to SwiftUI via UIViewControllerRepresentable First attempt, use Environment We conform to UIViewControllerRepresentable and make a Coordinator, which is the recommended way to manage the bridging with UIViewController. There’s some built in environment property we can use, one of those is presentationMode where we can call dismiss to dismiss the modal....

Issue #483 Every item in list must be uniquely identifiable List { ForEach(books, id: \.bookId) { book in NavigationLink(destination: BookView(book: book) .navigationBarTitle(book.name) ) { VStack { Text(book.name) } } } } In case of primitive, we can just provide id to conform to Identifiable extension String: Identifiable { public var id: String { return self } }

Issue #479 From ISO8601 spec, the problems are the representation and time zone ISO 8601 = year-month-day time timezone For date and time, there are basic (YYYYMMDD, hhmmss, ...) and extended format (YYYY-MM-DD, hh:mm:ss, ...) Time zone can be Zulu, offset or GMT Separator for date and time can be space, or T There are week format for date, but it is rarely used Timezone can be a lot of spaces after Second is optional Here are some valid strings...

Issue #477 Mark APIs availability @available(iOS 13.0, OSX 10.15, tvOS 13.0, watchOS 6.0, *) public extension View { } Check platform #if canImport(UIKit) import UIKit #elseif canImport(OSX) import AppKit #endif In watchOS app, it still can import UIKit, so for only iOS usage, we need to use os check #if canImport(UIKit) && os(iOS) Check environment #if targetEnvironment(macCatalyst) print("UIKit running on macOS") #else print("Your regular code") #endif #if targetEnvironment(simulator) // your simulator code #else // your real device code #endif

Issue #475 For a snack bar or image viewing, it’s handy to be able to just flick or toss to dismiss We can use UIKit Dynamic, which was introduced in iOS 7, to make this happen. Use UIPanGestureRecognizer to drag view around, UISnapBehavior to make view snap back to center if velocity is low, and UIPushBehavior to throw view in the direction of the gesture. import UIKit final class FlickHandler { private let viewToMove: UIView private let referenceView: UIView private var panGR: UIPanGestureRecognizer!...

Issue #474 SPM Go to Project -> Swift Packages, add package. For example https://github.com/onmyway133/EasyStash Select your WatchKit Extension target, under Frameworks, Libraries and Embedded Content add the library CocoaPods If we use CocoaPods, then it needs to be in WatchKit Extension target 'MyApp WatchKit Extension' do use_frameworks! pod 'EasyStash', :git => 'https://github.com/onmyway133/EasyStash' end

Issue #473 Before iOS 13 Use UIScreen.didConnectNotification NotificationCenter.default.addObserver(forName: UIScreen.didConnectNotification, object: nil, queue: nil) { (notification) in // Get the new screen information. let newScreen = notification.object as! UIScreen let screenDimensions = newScreen.bounds // Configure a window for the screen. let newWindow = UIWindow(frame: screenDimensions) newWindow.screen = newScreen // Install a custom root view controller in the window. self.configureAuxilliaryInterface(with: newWindow) // You must show the window explicitly. newWindow.isHidden = false // Save a reference to the window in a local array....

Issue #472 Build error view Use convenient code from Omnia To make view height dynamic, pin UILabel to edges and center import UIKit final class ErrorMessageView: UIView { let box: UIView = { let view = UIView() view.backgroundColor = R.color.primary view.layer.cornerRadius = 6 return view }() let label: UILabel = { let label = UILabel() label.styleAsText() label.textColor = R.color.darkText label.numberOfLines = 0 return label }() override init(frame: CGRect) { super.init(frame: frame) setup() } required init?...

Issue #471 let navigationController = UINavigationController(rootViewController: viewControllerA) navigationController.pushViewController(viewControllerB, animated: true) In view controller B, need to set hidesBottomBarWhenPushed in init final class ViewControllerB: UIViewController { let mainView = EditPaymentMethodView() var scenario: PaymentMethodScenario! init() { super.init(nibName: nil, bundle: nil) hidesBottomBarWhenPushed = true } required init?(coder: NSCoder) { fatalError() } }

Issue #470 Use NSTextAttachment inside NSAttributedString extension UILabel { func addTrailing(image: UIImage) { let attachment = NSTextAttachment() attachment.image = image let attachmentString = NSAttributedString(attachment: attachment) let string = NSMutableAttributedString(string: self.text!, attributes: [:]) string.append(attachmentString) self.attributedText = string } }

Issue #469 If there are lots of logics and states inside a screen, it is best to introduce parent and child container, and switch child depends on state. Each child acts as a State handler. In less logic case, we can introduce a Scenario class that holds the state. So the ViewController can be very slim. The thing with State is that all possible scenarios are clear and required to be handled...

Issue #465 Use EasyStash import EasyStash final class Store<T: Codable & ItemProtocol>: Codable { var items = [T]() func bookmark(item: T) { items.append(item) } func unbookmark(item: T) { guard let index = items.firstIndex(where: { $0.itemId == item.itemId }) else { return } items.remove(at: index) } func isBookmark(item: T) -> Bool { return items.contains(where: { $0.itemId == item.itemId }) } } import EasyStash final class StoreContainer { var food: Store<Food> static var shared = StoreContainer() let storage = try!...

Issue #464 typealias Completion = (Result<User, Error>) -> Void func validate(completion: @escaping Completion, then: (String, String, @escaping Completion) -> Void) {}

Issue #463 func zoom(location1: CLLocation, location2: CLLocation) { let bounds = GMSCoordinateBounds(coordinate: location1.coordinate, coordinate: location2.coordinate) let update = GMSCameraUpdate.fit(bounds, withPadding: 16) mapView.animate(with: update) }