ole

import XCTest

/// An expectation that is fulfilled when a Key Value Observing (KVO) condition
/// is met. It's variant of `XCTKVOExpectation` with support for native Swift
/// key paths.
final class KVOExpectation: XCTestExpectation {
    private var kvoToken: NSKeyValueObservation?

    /// Creates an expectation that is fulfilled when a KVO change causes the
    /// specified key path of the observed object to have an expected value.

ole

import Foundation

// Playing around with MeasurementFormatter.string(from: Unit)
let f = MeasurementFormatter()
f.locale = Locale(identifier: "de_DE")
f.unitOptions = .naturalScale
f.unitStyle = .long
f.string(from: UnitSpeed.milesPerHour)
f.string(from: UnitTemperature.celsius)

ole

import CoreData
import Foundation

/// Safely copies the specified `NSPersistentStore` to a temporary file.
/// Useful for backups.
///
/// - Parameter index: The index of the persistent store in the coordinator's
///   `persistentStores` array. Passing an index that doesn't exist will trap.
///
/// - Returns: The URL of the backup file, wrapped in a TemporaryFile instance

ole

#!/bin/sh
if ( [ "$CONFIGURATION" == "Debug" ] ) then
  echo "Enabling filesharing flags for '$CONFIGURATION' configuration in "${TARGET_BUILD_DIR}/${INFOPLIST_PATH}""
  /usr/libexec/PlistBuddy -c "Set :UIFileSharingEnabled true" "${TARGET_BUILD_DIR}/${INFOPLIST_PATH}"
  /usr/libexec/PlistBuddy -c "Set :LSSupportsOpeningDocumentsInPlace true" "${TARGET_BUILD_DIR}/${INFOPLIST_PATH}"
fi

ole

The dynamic wallpaper in MacOS Mojave is a single 114 MB .heic file that seems to contain 16 embedded images.

It also contains the following binary plist data in its metadata under the key "Solar". It's an array of 16 items, each with four keys:

• i (integer). This seems to be the image index.
• o (integer). This is always 1 or 0. Stephen Radford thinks it indicates dark mode (0) vs. light mode (1).
• a (decimal). I’m pretty sure this is the angle of the sun over the horizon. 0º = sunset/sunrise. 90º = sun directly overhead. Negative values = sun below horizon.
• z (decimal). This seems to be the cardinal position of the sun relative to the camera. 0º = sun is directly in front of the camera. 90º = sun is directly to the right of the camera. 180º = sun is directly behind the camera.

ole

import UIKit

let containingRect = CGRect(x: 0, y: 0, width: 100, height: 100)
let path1 = UIBezierPath(rect: containingRect)

let circleRect = CGRect(x: 50, y: 10, width: 80, height: 80)
let circleCenter = CGPoint(x: circleRect.midX, y: circleRect.midY)
let radius = circleRect.height / 2

/*

ole

/// Ignores `value` and just evaluates `pattern`.
/// Can be used to evaluate arbitrary expressions in a switch.
func ~=<A>(pattern: @autoclosure () -> Bool, value: A) -> Bool {
    return pattern()
}

let (x, y, z) = (0, 0, 1)

switch () /* can be anything */ {
case x > 0: print("x matches")

ole

import UIKit

/// A validation rule for text input.
public enum TextValidationRule {
    /// Any input is valid, including an empty string.
    case noRestriction
    /// The input must not be empty.
    case nonEmpty
    /// The enitre input must match a regular expression. A matching substring is not enough.
    case regularExpression(NSRegularExpression)

ole

import Foundation

/// An abstract class that makes building simple asynchronous operations easy.
/// Subclasses must override `main()` to perform any work and call `finish()`
/// when they are done. All `NSOperation` work will be handled automatically.
///
/// Source/Inspiration: https://stackoverflow.com/a/48104095/116862 and https://gist.github.com/calebd/93fa347397cec5f88233
open class AsyncOperation: Operation {
    public init(name: String? = nil) {
        super.init()

ole

// Challenge: Fill out this extension
//
// I have a solution for this return type:
//
//     var headAndTail: (head: Element, tail: AnySequence<Element>)?
//
// I don't think it can be done with tail: SubSequence.
extension Sequence {
    /// Destructures `self` into the first element (head) and the rest (tail).
    /// Returns `nil` if the sequence is empty.