JohnSundell

import SwiftUI

/// View that observes its position within a given coordinate space,
/// and assigns that position to the specified Binding.
struct PositionObservingView<Content: View>: View {
    var coordinateSpace: CoordinateSpace
    @Binding var position: CGPoint
    @ViewBuilder var content: () -> Content

    var body: some View {

JohnSundell

extension Command {
    enum Error: Swift.Error {
        case missing
        case invalid(String)
    }
}

JohnSundell

import Foundation

struct EquatableValueSequence<T: Equatable> {
    static func ==(lhs: EquatableValueSequence<T>, rhs: T) -> Bool {
        return lhs.values.contains(rhs)
    }

    static func ==(lhs: T, rhs: EquatableValueSequence<T>) -> Bool {
        return rhs == lhs
    }

JohnSundell

import SwiftUI

// Model + controller:

struct NamedTimer: Identifiable, Equatable {
    let id = UUID()
    var name: String
    var seconds = 0
}

JohnSundell

import SwiftUI

struct Item: Equatable, Identifiable {
    let id = UUID()
    var title: String
    var isFavorite = false
}

@MainActor class ListViewModel: ObservableObject {
    @Published private(set) var items: [Item] = []

JohnSundell

// A fun little game written in SwiftUI
// Copyright (c) John Sundell 2020, MIT license.
// This is a hacky implementation written just for fun.
// It's only verified to work on iPhones in portrait mode.

import SwiftUI

final class GameController: ObservableObject {
    @Published var plane = GameObject.plane()
    @Published private(set) var clouds = [GameObject]()

JohnSundell

// Either put this in a separate file that you only include in your macOS target
// or wrap the code in #if os(macOS) / #endif

import Cocoa

// Step 1: Typealias UIImage to NSImage
typealias UIImage = NSImage

// Step 2: You might want to add these APIs that UIImage has but NSImage doesn't.
extension NSImage {

JohnSundell

#!/bin/bash

ITERATION=1
EXTENSION="mp4"
FILENAME="$HOME/Desktop/Simulator Recording.$EXTENSION"

while [ -e "$FILENAME" ]
do
    ITERATION=$((ITERATION+1))
    FILENAME="$HOME/Desktop/Simulator Recording $ITERATION.$EXTENSION"

JohnSundell

extension Dictionary {
    mutating func value(for key: Key, orAdd closure: @autoclosure () -> Value) -> Value {
        if let value = self[key] {
            return value
        }
        
        let value = closure()
        self[key] = value
        return value
    }

JohnSundell

extension Optional {
    struct RequireError: Error, CustomStringConvertible {
        var description: String {
            return "Required optional value was nil"
        }
    }

    func require(orThrow errorClosure: @autoclosure () -> Error = RequireError()) throws -> Wrapped {
        switch self {
        case .some(let value):