iOS

Issue #670 To test for viewWillDisappear during UINavigationController popViewController in unit test, we need to simulate UIWindow so view appearance works. final class PopTests: XCTestCase { func testPop() { let window = UIWindow(frame: UIScreen.main.bounds) let navigationController = UINavigationController() window.rootViewController = navigationController let viewController = DetailViewController() navigationController.viewControllers = [ UIViewController(), viewController ] window.makeKeyAndVisible() let expectation = XCTestExpectation() navigationController.popViewController(animated: false) DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { XCTAssertTrue(viewController.wasDismissed) expectation.fulfill() } wait(for: [expectation], timeout: 1) } } class DetailViewController: UIViewController { override func viewWillDisappear(_ animated: Bool) { super....

Issue #660 Apply tintColor does not seem to have effect. datePicker.setValue(UIColor.label, forKeyPath: "textColor") datePicker.setValue(false, forKey: "highlightsToday")

Issue #631 beginBackgroundTask https://developer.apple.com/documentation/uikit/app_and_environment/scenes/preparing_your_ui_to_run_in_the_background/extending_your_app_s_background_execution_time When your app moves to the background, the system calls your app delegate’s applicationDidEnterBackground(_:) method. That method has five seconds to perform any tasks and return. Shortly after that method returns, the system puts your app into the suspended state. For most apps, five seconds is enough to perform any crucial tasks, but if you need more time, you can ask UIKit to extend your app’s runtime....

Issue #603 Need to set correct frame for mask layer or UILabel, as it is relative to the coordinate of the view to be masked let aView = UIView(frame: .init(x: 100, y: 110, width: 200, height: 100)) let textLayer = CATextLayer() textLayer.foregroundColor = UIColor.white.cgColor textLayer.string = "Hello world" textLayer.font = UIFont.preferredFont(forTextStyle: .largeTitle) textLayer.frame = aView.bounds aView.layer.mask = textLayer Use sizeToFit to ensure frame for UILabel let label = UILabel() label.frame.origin = CGPoint(x: 80, y: 80) label....

Issue #600 Use same CACurrentMediaTime final class AnimationSyncer { static let now = CACurrentMediaTime() func makeAnimation() -> CABasicAnimation { let animation = CABasicAnimation(keyPath: "opacity") animation.fillMode = .forwards animation.fromValue = 0 animation.toValue = 1 animation.repeatCount = .infinity animation.duration = 2 animation.beginTime = Self.now animation.autoreverses = true animation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut) return animation } }

Issue #598 It’s hard to see any iOS app which don’t use UITableView or UICollectionView, as they are the basic and important foundation to represent data. UICollectionView is very basic to use, yet a bit tedious for common use cases, but if we abstract over it, then it becomes super hard to customize. Every app is unique, and any attempt to wrap around UICollectionView will fail horribly. A sensable approach for a good abstraction is to make it super easy for normal cases, and easy to customize for advanced scenarios....

Issue #593 #if canImport(Combine) is not enough, need to specify in Other Linker Flags OTHER_LDFLAGS = -weak_framework Combine Read more https://stackoverflow.com/questions/57168931/optional-linking-for-swift-combine-framework-in-xcode-11

Issue #583 In UITests, we can use press from XCUIElement to test drag and drop let fromCat = app.buttons["cat1"].firstMatch let toCat = app.buttons["cat2"] let fromCoordinate = fromCat.coordinate(withNormalizedOffset: CGVector(dx: 0, dy: 0)) let toCoordinate = toCat.coordinate(withNormalizedOffset: CGVector(dx: 0, dy: -0.5)) fromCoordinate.press(forDuration: 1, thenDragTo: toCoordinate) and then take screenshot let screenshot = XCUIScreen.main.screenshot() let attachment = XCTAttachment(screenshot: screenshot) attachment.lifetime = .keepAlways attachment.name = name add(attachment) Screenshot capturing happens after the action, so it may be too late....

Issue #582 Use View Debugging Run on device, Xcode -> Debug -> View debugging -> Rendering -> Color blended layer On Simulator -> Debug -> Color Blended Layer Corner radius https://twitter.com/timoliverau/status/1135999854176395264 Okay. Talked to a Core Animation engineer again: cornerRadius was deliberately improved in Metal so it could be used everywhere. Using a bitmap is WAY heavier in terms of memory and performance. CALayer maskLayer is still heavy....

Issue #580 Events open url https://stackoverflow.com/questions/58624786/method-applicationopenurloptions-is-not-called Implement scene(_:openURLContexts:) in your scene delegate. If the URL launches your app, you will get scene(_:willConnectTo:options:) instead and it’s in the options. life cycle https://stackoverflow.com/questions/56508764/app-delegate-methods-arent-being-called-in-ios-13 Here’s how it works: If you have an “Application Scene Manifest” in your Info.plist and your app delegate has a configurationForConnectingSceneSession method, the UIApplication won’t send background and foreground lifecycle messages to your app delegate....

Issue #571 From CGFloat.pi / 2 to -CGFloat.pi / 2 + epsilon

Issue #570 Use viewSafeArea @available(iOS 11.0, *) override func viewSafeAreaInsetsDidChange() { super.viewSafeAreaInsetsDidChange() self.collectionView.reloadData() } Use https://developer.apple.com/documentation/uikit/uiview/2891102-safearealayoutguide view.safeAreaLayoutGuide.layoutFrame https://developer.apple.com/documentation/uikit/uiview/2891103-safeareainsets For the view controller’s root view, the insets account for the status bar, other visible bars, and any additional insets that you specified using the additionalSafeAreaInsets property of your view controller. For other views in the view hierarchy, the insets reflect only the portion of the view that is covered. For example, if a view is entirely within the safe area of its superview, the edge insets in this property are 0....

Issue #569 From documentation https://developer.apple.com/documentation/uikit/uicollectionviewlayout/1617726-initiallayoutattributesforappear This method is called after the prepare(forCollectionViewUpdates:) method and before the finalizeCollectionViewUpdates() method for any decoration views that are about to be inserted. Your implementation should return the layout information that describes the initial position and state of the view. The collection view uses this information as the starting point for any animations. (The end point of the animation is the view’s new location in the collection view....

Issue #567 Code Upstream Make open Adapter https://github.com/onmyway133/Upstream import UIKit public protocol AdapterDelegate: class { /// Apply model to view func configure(model: Any, view: UIView, indexPath: IndexPath) /// Handle view selection func select(model: Any) /// Size the view func size(model: Any, containerSize: CGSize) -> CGSize } /// Act as DataSource and Delegate for UICollectionView, UITableView open class Adapter: NSObject, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UITableViewDataSource, UITableViewDelegate { public var sections: [Section] = [] public weak var collectionView: UICollectionView?...

Issue #561 Read more https://medium.com/rosberryapps/ios-safe-area-ca10e919526f https://blog.smartnsoft.com/layout-guide-margins-insets-and-safe-area-demystified-on-ios-10-11-d6e7246d7cb8 https://www.matrixprojects.net/p/safe-area-insets/ https://stackoverflow.com/questions/37796884/on-ios-what-are-the-differences-between-margins-edge-insets-content-insets-a/47614397

Issue #550 Check shouldHighlightItem -> shouldSelectItem -> didSelectItem Gesture recognizer isUserInteractionEnabled

Issue #548 https://stackoverflow.com/questions/35522618/universal-links-on-ios-vs-deep-links-url-schemes

Issue #539 XCUIScreenshot extension XCTestCase { func takeScreenshot(name: String) { let screenshot = XCUIScreen.main.screenshot() let attach = XCTAttachment(screenshot: screenshot) attach.lifetime = .keepAlways add(attach) } } Gather screenshot for localization Creating Great Localized Experiences with Xcode 11 xcresult from Xcode 11 https://www.chargepoint.com/engineering/xcparse/ xcparse Command line tool & Swift framework for parsing Xcode 11+ xcresult xcresulttool Testing in Xcode Test plan WWDC19: Getting Started with Test Plan for XCTest

Issue #538 Hierarchy UIToolbar -> _UIToolbarContentView -> _UIButtonBarStackVie UIToolbarContentView _UIToolbarContentView's width should equal 0 _UIToolbarContentView's height should equal 0 Workaround that fixes 1 warning toolbar.setItems(items, animated: false) toolbar.updateConstraintsIfNeeded() Set frame explicitly Use a non .zero frame that is close to the view bounds width let toolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: 375, height: 30)) DispatchQueue.main.async { self.toolbar.updateConstraintsIfNeeded() }

Issue #537 Specify launch arguments In xcodebuild, specify launch arguments. You can specify this under Launch Arguments in Run action of the app scheme or UITest scheme -AppleLanguages (jp) -AppleLocale (jp_JP) (lldb) po ProcessInfo().arguments ▿ 11 elements - 0 : "/Users/khoa/Library/Developer/CoreSimulator/Devices/561F2B45-26B2-4897-98C4-8A917AEB48D2/data/Containers/Bundle/Application/436E0A43-8323-4F53-BBE0-6F75F674916F/TestAppUITests-Runner.app/TestAppUITests-Runner" - 1 : "-AppleLanguages" - 2 : "(ja)" - 3 : "-AppleTextDirection" - 4 : "NO" - 5 : "-AppleLocale" - 6 : "ja_JP" - 7 : "-NSTreatUnknownArgumentsAsOpen" - 8 : "NO" - 9 : "-ApplePersistenceIgnoreState" - 10 : "YES" In UITests, pass launch arguments from UITest scheme to UITest application...