zwaldowski

A [term]_method is like a function; you will learn more about them later.

A [term]_method_ is like a function; you will learn more about them later.

A [term]_method is like a function; you will learn more about them later.

zwaldowski

import UIKit
import ObjectiveC.runtime

// MARK: - IOKit

@objc private protocol IOHIDEvent: NSObjectProtocol {}

private struct IOHIDDigitizerEventMask: OptionSet {
    let rawValue: UInt32
    init(rawValue: UInt32) { self.rawValue = rawValue }

zwaldowski

import UIKit

class DoneAccessoryView: UIInputView {
    
    private let toolbar = UIToolbar()
    
    init() {
        super.init(frame: .zero, inputViewStyle: .default)
        translatesAutoresizingMaskIntoConstraints = false
        allowsSelfSizing = true

zwaldowski

import UIKit

private class CardPresenter: UIPresentationController {
    
    private let dimmingView = UIView()
    private let roundingView = UIView()
    
    // MARK: -
    
    override init(presentedViewController: UIViewController, presenting presentingViewController: UIViewController?) {

zwaldowski

{
    si =     (
                {
            a = "-0.3427528387535028";
            i = 0;
            o = 1;
            z = "270.9334057827345";
        },
                {
            a = "-10.23975864472505";

zwaldowski

import Photos

private extension Collection where Element == URLQueryItem {

    subscript(_ name: String) -> String? {
        return first { $0.name == name }?.value
    }

}

zwaldowski

import Foundation

struct Test {

    var a: String?
    var b: Int?
    var c: NSObject?
    var x = 42

    enum Error: Swift.Error {

zwaldowski

import Foundation

private func loadCSymbol<T>(named name: String, of _: T.Type = T.self) -> T {
    let RTLD_DEFAULT = UnsafeMutableRawPointer(bitPattern: -2)
    guard let sym = dlsym(RTLD_DEFAULT, name) else { preconditionFailure(String(cString: dlerror())) }
    return unsafeBitCast(sym, to: T.self)
}

private let CC_SHA1_DIGEST_LENGTH = 20
private let CC_SHA1: @convention(c) (UnsafeRawPointer, Int32, UnsafeMutablePointer<UInt8>) -> UnsafeMutablePointer<UInt8> = loadCSymbol(named: "CC_SHA1")

zwaldowski

#import <Foundation/Foundation.h>

typedef void(^SomeBlock)(void);

@interface Foo: NSObject

// If this one isn't marked `_Nonnull`, a caller of the class
// won't warn.
- (void)doAThingWithCompletionHandler:(_Nonnull SomeBlock)handler;

zwaldowski

import Foundation

// Stolen from https://github.com/ole/whats-new-in-swift-4/blob/master/Whats-new-in-Swift-4.playground/Pages/Encoding%20and%20decoding.xcplaygroundpage/Contents.swift#L14-L31
struct Card: Codable, Equatable {
    enum Suit: String, Codable {
        case clubs, spades, hearts, diamonds
    }

    enum Rank: Int, Codable {
        case two = 2, three, four, five, six, seven, eight, nine, ten, jack, queen, king, ace