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#if targetEnvironment(simulator)
let isRunningOnSimulator = true
#else
let isRunningOnSimulator = false
#endif

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// From: https://www.avanderlee.com/swift/async-await/
// More info on @available: https://www.avanderlee.com/swift/available-deprecated-renamed/

@available(*, deprecated, renamed: "fetchImages()")
func fetchImages(completion: @escaping (Result<[UIImage], Error>) -> Void) { ... }

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// Taken from Apple's App Dev Training: https://developer.apple.com/tutorials/app-dev-training/

    /// This color is either black or white, whichever is more accessible when viewed against the scrum color.
    var accessibleFontColor: Color {
        var red: CGFloat = 0
        var green: CGFloat = 0
        var blue: CGFloat = 0
        UIColor(self).getRed(&red, green: &green, blue: &blue, alpha: nil)
        return isLightColor(red: red, green: green, blue: blue) ? .black : .white
    }

yannxou

struct MyType {
    
    var property: String = "" {
        didSet {
            print("Property didSet: \(property)")
        }
    }
    
    init(property: String) {
        // self.property = property  // this way didSet is not called on init

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import SwiftUI

/// Note: Height is calculated dynamically and it is available only in run-time. To test it with Preview set a fixed size.
struct AttributedText: View {
    @State private var textSize: CGSize = .zero
    var attributedString: NSAttributedString
    
    init(_ text: NSAttributedString) {
        attributedString = text
    }

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struct LoaderView<Content>: View where Content: View {
    var isShowing: Bool
    var content: () -> Content
    var body: some View {
        GeometryReader { geometry in
            ZStack(alignment: .center) {
                self.content()
                    .disabled(self.isShowing)
                    .blur(radius: self.isShowing ? 8 : 0)
                ActivityIndicator(

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struct ContentView: View {
    @Environment(\.colorScheme) var colorScheme: ColorScheme
    var body: some View {
        self.preferencesButton
    }
    var preferencesButton: some View {
        Button(action: {
            self.navigator.presenting = .preferences
        }) {
        Image(systemName: “selection.pin.in.out”)

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// Credit: https://stackoverflow.com/questions/4421267/how-to-get-text-string-from-nth-line-of-uilabel/43284779

extension UILabel {

    /// creates an array containing one entry for each line of text the label has
    var lines: [String]? {

        guard let text = text, let font = font else { return nil }

        let attStr = NSMutableAttributedString(string: text)

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// code from the book “Thinking in SwiftUI” by Chris Eidhof

extension View {
    func badge(count: Int) -> some View {
        overlay(
            ZStack {
                if count != 0 {
                    Circle()
                        .fill(Color.red)
                    Text("\(count)")

yannxou

1. xcrun simctl erase all 
2. Restart computer!!