yusuke024

import UIKit
import PlaygroundSupport

class QRCodeView: UIView {
    lazy var filter = CIFilter(name: "CIQRCodeGenerator")
    lazy var imageView = UIImageView()

    override init(frame: CGRect) {
        super.init(frame: frame)
        addSubview(imageView)

yusuke024

//
//  CameraController.swift
//

import AVFoundation
import Photos
import UIKit

class CameraController: UIViewController {
    enum Camera {

yusuke024

import UIKit

import AVFoundation

class ViewController: UIViewController {
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        switch AVCaptureDevice.authorizationStatus(for: .video) {
        case .notDetermined:

yusuke024

Note on UIViewControllerAnimatedTransitioning and UIViewControllerInteractiveTransitioning

UINavigationController

• Do not pass true to UIView.snapshotView(afterScreenUpdates:) when create a snapshot for animated transition object (false is fine).
• Don't call animator.startAnimation() or animator.pauseAnimator() in startInteractiveTransition(_:)
• If interruptibleAnimator(using:) is implemented, UINavigationController will observe fractionComplete from the returned animator object (not confirmed but very likely) and will animate the navigation bar accordingly to that value. Calling UIViewControllerContextTransitioning.updateInteractiveTransition(_:) will almost have no effect on the navigation bar animation (but you should call it anyway).
• If interruptibleAnimator(using:) is not implemented, UINavigationController will use values that are passed to UIViewControllerContextTransitioning.updateInteractiveTransition(_:) to animate the navigation bar.

UINavigationBar

yusuke024

import XCTest

final class Static {
    func a() { 1 + 1 }
    func b() { a() }
    func c() { b() }
}

class Dynamic {
    func a() { 1 + 1 }

yusuke024

import XCTest

class MyTestCase: XCTestCase {
    func testExample() {
        measure {
            // Code to measure
        }
    }
}

yusuke024

import RxSwift

///
/// The operators can be generated by running the below code with Swift 4
///
//
//let methodCount = 6
//
//print("""
//extension ObservableType {

yusuke024

//: A UIKit based Playground to present user interface
  
import UIKit
import Vision
import PlaygroundSupport

class ViewController : UIViewController {
    let imageView = UIImageView()
    let overlayImageView = UIImageView()

yusuke024

import UIKit

struct Point {
    let x: Double
    let y: Double
}

extension Point {
    static let zero = Point(x: 0, y: 0)

yusuke024

// Protocols

protocol Serializable {
    func serialized() -> String
}

protocol Field: Serializable {
    // ...
}