20180721 code defragment

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CASE #1. Data + Logic + UI
class ViewController: UIViewController {
@IBOutlet var number1: UILabel!
@IBOutlet var result: UILabel!
struct CalcData {
let num1: Int
let num2: Int
}
private func textToInt(_ text: String?) -> Int {
guard let text = text else { return 0 }
return Int(text) ?? 0
}
@IBAction func calcResult(_ sender: Any) {
let n1 = textToInt(number1.text)
let data = CalcData(num1: n1, num2: n2)
let res = calcPlus(data)
result.text = intToText(res)
}
private func intToText(_ num: Int) -> String {
return "(num)"
}
private func calcPlus(_ data: CalcData) -> Int {
return data.num1 + data.num2
}
}
❓

// MARK: - DATA
struct CalcData {
let num1: Int
let num2: Int
}
// MARK: - LOGIC
private func textToInt(_ text: String?) -> Int {
}
private func intToText(_ num: Int) -> String {
return "(num)"
}
private func calcPlus(_ data: CalcData) -> Int {
}
// MARK: - UI
}
}
❗

CASE #2. Data Setter ❓
@IBOutlet var textLabel: UILabel!
var count: Int = 0
@IBAction func addOne() {
count += 1
textLabel.text = "(count)"
}
@IBAction func subOne() {
count -= 1
textLabel.text = "(count)" // duplicated
}
}

CASE #2. Data Setter ❗
var count: Int = 0 {
didSet {
textLabel.text = "(count)"
}
}
count += 1
}
count -= 1
}
}

CASE #3. Overrides
override func viewDidLoad() {
super.viewDidLoad()
setupNavigationBar()
}
func setupNavigationBar() {
self.navigationController?.title = "App Title"
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
self.navigationController?.setNavigationBarHidden(false, animated: animated)
//Other Codes
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.navigationController?.setNavigationBarHidden(true, animated: animated)
//Other Codes
}
}
❓

class BaseViewController: UIViewController {
var viewWillAppearActions: [(Bool) -> ()] = []
var viewWillDisappearActions: [(Bool) -> ()] = []
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
viewWillAppearActions.forEach({ $0(animated) })
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
viewWillDisappearActions.forEach({ $0(animated) })
}
}
class ViewController: BaseViewController {
super.viewDidLoad()
}
viewWillAppearActions.append({ [weak self] anim in
self?.navigationController?.setNavigationBarHidden(false, animated: anim)
})
viewWillDisappearActions.append({ [weak self] anim in
self?.navigationController?.setNavigationBarHidden(true, animated: anim)
})
}
}
❗CASE #3. Overrides

super.viewDidLoad()
setupKeyboardEvent()
}
func setupKeyboardEvent() {
NotificationCenter.default.addObserver(self,
selector: #selector(onKeyboardWillShow),
name: .UIKeyboardWillShow,
object: nil)
selector: #selector(onKeyboardWillHide),
name: .UIKeyboardWillHide,
object: nil)
}
@objc func onKeyboardWillShow(notification: Notification) {
print("Keyboard will show")
}
@objc func onKeyboardWillHide(notification: Notification) {
print("Keyboard will hide")
}
}
CASE #4. Selector ❓

class KeyboardEventWrapper {
var onKeyboardWillShowCallBack: (Notification) -> () = { _ in }
init() {
selector: #selector(onKeyboardWillShow),
name: .UIKeyboardWillShow,
object: nil)
}
@objc func onKeyboardWillShow(notification: Notification) {
onKeyboardWillShowCallBack(notification)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
}
var keyboardEventWrapper: KeyboardEventWrapper!
super.viewDidLoad()
}
keyboardEventWrapper = KeyboardEventWrapper()
keyboardEventWrapper.onKeyboardWillShowCallBack = { _ in
}
}
}
❗CASE #4. Selector

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
@IBAction func onLoadImage() {
let picker = UIImagePickerController()
picker.delegate = self
present(picker, animated: true, completion: nil)
}
// MARK: - UIImagePickerControllerDelegate
func imagePickerController(_ picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String: Any]) {
let originalInfo = info[UIImagePickerControllerOriginalImage]
guard let originalImage = originalInfo as? UIImage else { return }
// ...
picker.dismiss(animated: true, completion: nil)
}
}
CASE #5. Delegate ❓

class ImagePickerWrapper: NSObject, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var onImagePicked: (UIImage?) -> () = { _ in }
func showImagePicker(on vc: UIViewController) {
picker.delegate = self
vc.present(picker, animated: true, completion: nil)
}
// MARK: - UIImagePickerControllerDelegate
let originalInfo = info[UIImagePickerControllerOriginalImage]
guard let originalImage = originalInfo as? UIImage else { return }
onImagePicked(originalImage)
picker.dismiss(animated: true, completion: nil)
}
}
var imagePicker: ImagePickerWrapper!
imagePicker = ImagePickerWrapper()
imagePicker.showImagePicker(on: self)
imagePicker.onImagePicked = { image in
guard let image = image else { return }
// ...
}
}
}
❗CASE #5. Delegate

struct CalcData {
let num1: Int
let num2: Int
}
func textToInt(_ text: String?) -> Int {
}
func intToText(_ num: Int) -> String {
return "(num)"
}
func calcPlus(_ data: CalcData) -> Int {
}
}
}
Model.swift
Context.swift
ViewController.swift
❗❗

CASE #2. Data Setter
import RxSwift
import RxCocoa
// Common Functions
let intToText = { (i: Int) in "(i)" }
///
let disposeBag = DisposeBag()
let count = BehaviorRelay<Int>(value: 0)
super.viewDidLoad()
count.map(intToText)
.bind(to: textLabel.rx.text)
.disposed(by: disposeBag)
}
count.accept(count.value + 1)
}
count.accept(count.value - 1)
}
}
❗❗

CASE #2. Data Setter
import RxSwift
import RxCocoa
// Common Functions
let intToText = { (i: Int) in "(i)" }
///
@IBOutlet var textLabelx10: UILabel!
let count = BehaviorRelay<Int>(value: 0)
super.viewDidLoad()
count.map(intToText)
.bind(to: textLabel.rx.text)
count.map({ $0 * 10 })
.map(intToText)
.bind(to: textLabelx10.rx.text)
}
count.accept(count.value + 1)
}
count.accept(count.value - 1)
}
}
❗❗

import RxSwift
import RxCocoa
import RxViewController // <==
super.viewDidLoad()
}
self.rx.viewWillAppear.subscribe(onNext: { [weak self] anim in
self?.navigationController?.setNavigationBarHidden(false, animated: anim)
}).disposed(by: disposeBag)
self.rx.viewWillDisappear.subscribe(onNext: { [weak self] anim in
self?.navigationController?.setNavigationBarHidden(true, animated: anim)
}).disposed(by: disposeBag)
}
}
CASE #3. Overrides ❗❗

import UIKit
import RxSwift
import RxCocoa
super.viewDidLoad()
}
NotificationCenter.default.rx.notification(.UIKeyboardWillShow)
.subscribe(onNext: { notifiaction in
})
NotificationCenter.default.rx.notification(.UIKeyboardWillHide)
.subscribe(onNext: { notifiaction in
print("Keyboard will hide")
})
}
}
CASE #4. Selector ❗❗

import UIKit
import RxSwift
import RxCocoa
@IBOutlet weak var imageView: UIImageView!
present(picker, animated: true, completion: nil)
picker.rx.didFinishPickingMediaWithInfo
.map({ info -> UIImage? in
info[UIImagePickerControllerOriginalImage] as? UIImage
})
.bind(to: imageView.rx.image)
}
}
CASE #5. Delegate ❗❗

// MARK:- UIImagePickerController.rx
// picker.rx.didFinishPickingMediaWithInfo
// ~~~~~~ ~~
// Base Reactive
extension Reactive where Base: UIImagePickerController {
public var didFinishPickingMediaWithInfo: Observable<[String : Any]> {
return RxImagePickerProxy.proxy(for: base)
.didFinishPickingMediaWithInfoSubject
.asObservable()
.do(onCompleted: {
self.base.dismiss(animated: true, completion: nil)
})
}
public var didCancel: Observable<Void> {
return RxImagePickerProxy.proxy(for: base)
.didCancelSubject
.asObservable()
.do(onCompleted: {
self.base.dismiss(animated: true, completion: nil)
})
}
}

import UIKit
import RxSwift
import RxCocoa
public typealias ImagePickerDelegate = UIImagePickerControllerDelegate & UINavigationControllerDelegate
extension UIImagePickerController: HasDelegate {
public typealias Delegate = ImagePickerDelegate
}
class RxImagePickerProxy: DelegateProxy<UIImagePickerController, ImagePickerDelegate>,
DelegateProxyType, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
public init(imagePicker: UIImagePickerController) {
super.init(parentObject: imagePicker, delegateProxy: RxImagePickerProxy.self)
}
//MARK:- DelegateProxyType
public static func registerKnownImplementations() {
self.register { RxImagePickerProxy(imagePicker: $0) }
}
static func currentDelegate(for object: UIImagePickerController) -> ImagePickerDelegate? {
return object.delegate
}
static func setCurrentDelegate(_ delegate: ImagePickerDelegate?, to object: UIImagePickerController)
{
object.delegate = delegate
}
//MARK:- Proxy Subject
//MARK:- UIImagePickerControllerDelegate
//MARK:- Completed
}

class RxImagePickerProxy: DelegateProxy<UIImagePickerController, ImagePickerDelegate>,
DelegateProxyType, UIImagePickerControllerDelegate, UINavigationControllerDelegate
{
//MARK:- DelegateProxyType
//MARK:- Proxy Subject
internal lazy var didFinishPickingMediaWithInfoSubject = PublishSubject<[String : Any]>()
internal lazy var didCancelSubject = PublishSubject<Void>()
//MARK:- UIImagePickerControllerDelegate
didFinishPickingMediaWithInfoSubject.onNext(info)
didFinishPickingMediaWithInfoSubject.onCompleted()
didCancelSubject.onCompleted()
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
didCancelSubject.onNext(())
didCancelSubject.onCompleted()
didFinishPickingMediaWithInfoSubject.onCompleted()
}
//MARK:- Completed
deinit {
self.didFinishPickingMediaWithInfoSubject.onCompleted()
self.didCancelSubject.onCompleted()
}
}

Model.swift
struct CalcData {
let n1: Int?
let n2: Int?
let result: Int?
}
extension CalcData {
static func empty() -> CalcData {
return CalcData(n1: nil, n2: nil, result: nil)
}
}

Context.swift (Business Logic)
let i2s = { (i: Int?) in "(i ?? 0)" }
let s2i = { (s: String?) in Int(s ?? "0") }
class Context {
let model = BehaviorRelay<CalcData>(value: CalcData.empty())
func doCalc(data: CalcData) -> CalcData {
guard let n1 = data.n1 else { return data }
let result = n1 + n2
return CalcData(n1: n1, n2: n2, result: result)
}
}

@IBOutlet weak var n1Field: UITextField! // Input
@IBOutlet weak var resultLabel: UILabel! // Output
@IBOutlet weak var calcButton: UIButton! // Event
let context = Context()
super.viewDidLoad()
bindUI()
bindEvent()
}
func bindUI() {
// ...
}
func bindEvent() {
// …
}
}

func bindUI() {
//n1 input
n1Field.rx.text.map(s2i)
.withLatestFrom(context.model) { (n1, dat) in
CalcData(n1: n1, n2: dat.n2, result: dat.result)
}
.bind(to: context.model)
//n2 input
CalcData(n1: dat.n1, n2: n2, result: dat.result)
}
//result output
viewModel.model.map({ $0.result })
.map(i2s)
.bind(to: resultLabel.rx.text)
}
func bindEvent() {
//event
calcButton.rx.tap
.withLatestFrom(context.model)
.map(context.doCalc)
}
}

Summary
let context = Context()
super.viewDidLoad()
bindUI()
bindEvent()
}
func bindUI() {
//n1 input
}
//n2 input
}
//result output
.map(i2s)
}
func bindEvent() {
//event
calcButton.rx.tap
.withLatestFrom(context.model)
.map(context.doCalc)
}
}
struct CalcData {
let n1: Int?
let n2: Int?
let result: Int?
}
}
}
View
ViewController
Context
Model
let i2s = { (i: Int?) in "(i ?? 0)" }
class Context {
}
}

struct CalcData {
let n1: Int?
let n2: Int?
let result: Int?
}
}
}
View
ViewController
Context
Model
ViewModel
Summary
let viewModel = ViewModel()
super.viewDidLoad()
bindUI()
bindEvent()
}
func bindUI() {
//n1 input
.withLatestFrom(viewModel.model) { (n1, dat) in
}
.bind(to: viewModel.model)
//n2 input
.withLatestFrom(viewModel.model) { (n2, dat) in
}
//result output
.map(i2s)
}
func bindEvent() {
//event
calcButton.rx.tap
.withLatestFrom(viewModel.model)
.map(viewModel.doCalc)
}
}
let i2s = { (i: Int?) in "(i ?? 0)" }
class ViewModel {
}
}

20180721 code defragment

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20180721 code defragment