JoshuaSullivan

=========================
Color Absolute Difference
=========================

[Availability]
	  iOS: 14
	macOS: 11.0

[Categories]
	Color Adjustment, Video, Interlaced, Non-Square Pixels, Still Image, Built-In

JoshuaSullivan

import Foundation
import CoreImage

struct FilterInput {

    struct ValueRange {
        let minValue: Float
        let maxValue: Float
        let sliderMin: Float?
        let sliderMax: Float?

JoshuaSullivan

import UIKit
import NaturalLanguage
import PlaygroundSupport

//: Your secret API key from `https://dictionaryapi.com` goes here.
//: THIS WON'T WORK UNLESS YOU GET A KEY.
let thesaurusKey = ""

//: The string you want to work on.
var testString = "The bright sun set behind the green hills. Thin clouds streaked the red sky."

JoshuaSullivan

import UIKit
import Combine

/// This class wraps a `CADisplayLink` and exposes its callback as a Combine Publisher.
///
class CombineDisplayLink {

    /// An object that includes timing information about the screen refresh.
    ///
    struct Tick {

JoshuaSullivan

Core Image Filters

iOS 13 has 218 filters.

New Filters in iOS 13

• CIDocumentEnhancer
• CIGaborGradients
• CIKeystoneCorrectionCombined
• CIKeystoneCorrectionHorizontal
• CIKeystoneCorrectionVertical

JoshuaSullivan

Core Image Filters

iOS 12.2 has 207 filters.

Accordion Fold Transition (CIAccordionFoldTransition)

First available: iOS 8

Transitions from one image to another of a differing dimensions by unfolding.

JoshuaSullivan

protocol AnalyticsBackEnd {
    static func log(_ name: String)
}

extension Analytics: AnalyticsBackEnd {}

JoshuaSullivan

extension UIImage.Orientation {
    /// Get the equivalent `CGImagePropertyOrientation` enum case.
    var cgOrientation: CGImagePropertyOrientation {
        switch self {
        case .up:               return .up
        case .down:             return .down
        case .left:             return .left
        case .right:            return .right
        case .upMirrored:       return .upMirrored
        case .downMirrored:     return .downMirrored

JoshuaSullivan

//: # Natural Language Framework
//: by Josh Sullivan
import Swift
import NaturalLanguage

//: Create a short string to test.
let str = "I am the very model of a modern major general! 😎"

//: And a longer one. Yay, multi-line String literals!
let longStr = """

JoshuaSullivan

//: # Setting up Swift 4 KVO
import Foundation

//: This class has a pair of properties that can be observied by KVO.
//: - Note: This class *must* inheret from `NSObject` in order to posess the KVO functionality.
class ObservableClass: NSObject {
    
    /// An observable string property. Note that it most be annotated with both "@objc" (expose the property to the
    /// Objective-C runtime) and "dynamic" (enables KVO for the property).
    @objc dynamic private(set) var stringProperty: String = "Starting string!"