mattt

Greetings, NSHipsters!

As we prepare to increment our NSDateComponents -year by 1, it's time once again for NSHipster end-of-the-year Reader Submissions! Last year, we got some mind-blowing tips and tricks. With the release of iOS 7 & Mavericks, and a year's worth of new developments in the Objective-C ecosystem, there should be a ton of new stuff to write up for this year.

Submit your favorite piece of Objective-C trivia, framework arcana, hidden Xcode feature, or anything else you think is cool, and you could have it featured in the year-end blowout article. Just comment on this gist below!

Here are a few examples of the kind of things I'd like to see:

• Using NSStringFromSelector(@selector()) as a safer way to do KVC / KVO / NSCoding.
• Panic's [rather surprising discovery about the internals of the Lightning Digital AV Adapter](http://www.panic.com/blog/the-lightning-di

mattt

//
//  RecipePageRenderer.swift
//  (c) 2014 Nate Cook, licensed under the MIT License
//

import UIKit
import AVFoundation

/// Units for printing content insets
let POINTS_PER_INCH: CGFloat = 72

mattt

import Foundation

extension Locale {
    func localizedCurrencySymbol(forCurrencyCode currencyCode: String) -> String? {
        guard let languageCode = languageCode, let regionCode = regionCode else { return nil }

        /* 
         Each currency can have a symbol ($, £, ¥), 
         but those symbols may be shared with other currencies.
         For example, in Canadian and American locales,

mattt

import NaturalLanguage

let languages: [NLLanguage] = [
    .amharic, .arabic, .armenian, .bengali, .bulgarian,
    .burmese, .catalan, .cherokee, .croatian, .czech,
    .danish, .dutch, .english, .finnish, .french,
    .georgian, .german, .greek, .gujarati, .hebrew,
    .hindi, .hungarian, .icelandic, .indonesian, .italian,
    .japanese, .kannada, .khmer, .korean, .lao,
    .malay, .malayalam, .marathi, .mongolian, .norwegian,

mattt

import UIKit

#if canImport(SwiftUI) && DEBUG
import SwiftUI
struct UIViewControllerPreview<ViewController: UIViewController>: UIViewControllerRepresentable {
    let viewController: ViewController

    init(_ builder: @escaping () -> ViewController) {
        viewController = builder()
    }

mattt

Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \

mattt

import Foundation

// MARK: - Comparable

extension NSDecimalNumber: Comparable {}

public func ==(lhs: NSDecimalNumber, rhs: NSDecimalNumber) -> Bool {
    return lhs.compare(rhs) == .OrderedSame
}

mattt

import Foundation

extension Collection where Element: Comparable {    
    func sorted(ascending: Bool = true, using comparator: (Element) -> (Element) -> ComparisonResult) -> [Element] {
        return self.sorted { lhs, rhs in
            comparator(lhs)(rhs) == (ascending ? .orderedAscending : .orderedDescending)
        }
    }
}

mattt

func zalgo(_ string: String, intensity: Int = 5) -> String {
    let combiningDiacriticMarks = 0x0300...0x036f
    let latinAlphabetUppercase = 0x0041...0x005a
    let latinAlphabetLowercase = 0x0061...0x007a
    
    var output: [UnicodeScalar] = []
    for scalar in string.unicodeScalars {
        output.append(scalar)
        guard (latinAlphabetUppercase).contains(numericCast(scalar.value)) ||
              (latinAlphabetLowercase).contains(numericCast(scalar.value))

mattt

// See: https://devforums.apple.com/message/1000934#1000934

import Foundation

// Logic

operator prefix ¬ {}
@prefix func ¬ (value: Bool) -> Bool {
    return !value
}