Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
20190117_iOSLT_CBLinSwift.pdf
Search
shtnkgm
January 17, 2019
Programming
0
88
20190117_iOSLT_CBLinSwift.pdf
Code-Based Layout in Swift
shtnkgm
January 17, 2019
Tweet
Share
More Decks by shtnkgm
See All by shtnkgm
Combine入門
shtnkgm
2
280
Property Wrappers
shtnkgm
0
340
Saliency Detection
shtnkgm
0
45
パフォーマンス改善とユニットテスト
shtnkgm
4
1.6k
iOSのコードベースレイアウト
shtnkgm
2
770
SwiftとFunctional Reactive Programming
shtnkgm
0
170
20180710_iOSLT_iOSでDarkModeを実装する
shtnkgm
0
88
20180410_iOSLT_SwiftとProtocol-OrientedProgramming
shtnkgm
0
110
20180220_iOSLT_Swiftとオブジェクト間の通知のパターン
shtnkgm
0
120
Other Decks in Programming
See All in Programming
Claude Codeで実装以外の開発フロー、どこまで自動化できるか?失敗と成功
ndadayo
2
200
WebAssemblyインタプリタを書く ~Component Modelを添えて~
ruccho
1
860
What's new in Adaptive Android development
fornewid
0
140
『リコリス・リコイル』に学ぶ!! 〜キャリア戦略における計画的偶発性理論と変わる勇気の重要性〜
wanko_it
1
540
ライブ配信サービスの インフラのジレンマ -マルチクラウドに至ったワケ-
mirrativ
1
240
パスタの技術
yusukebe
1
390
AIエージェント開発、DevOps and LLMOps
ymd65536
1
120
Scale out your Claude Code ~自社専用Agentで10xする開発プロセス~
yukukotani
9
2.3k
Terraform やるなら公式スタイルガイドを読もう 〜重要項目 10選〜
hiyanger
13
3.1k
「リーダーは意思決定する人」って本当?~ 学びを現場で活かす、リーダー4ヶ月目の試行錯誤 ~
marina1017
0
230
LLMOpsのパフォーマンスを支える技術と現場で実践した改善
po3rin
8
940
DockerからECSへ 〜 AWSの海に出る前に知っておきたいこと 〜
ota1022
5
1.6k
Featured
See All Featured
Music & Morning Musume
bryan
46
6.7k
Building an army of robots
kneath
306
45k
The Pragmatic Product Professional
lauravandoore
36
6.8k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
667
120k
Build your cross-platform service in a week with App Engine
jlugia
231
18k
Statistics for Hackers
jakevdp
799
220k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
10
1k
Making the Leap to Tech Lead
cromwellryan
134
9.5k
Become a Pro
speakerdeck
PRO
29
5.5k
Building Flexible Design Systems
yeseniaperezcruz
328
39k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.8k
Transcript
CBL in Swift Shota Nakagami
Talking about "CBL"
!
CBL Code-Based layout
I ! Code-Based Layout
How to layout ? 4 StoryBoard 4 XIB 4 Code-BasedʢProgrammaticallyʣ
Storyboard & XIB features 4 Ease of use ☺ 4
Segue ☺ 4 Visual (multi device screen size) 4 Constraint Checker ☺ 4 Non-Reusable " 4 Hard to Resolve Conflict " 4 Hard to review (XML) "
Testable? ! class ViewController: UIViewController { let dependency: Dependency //
Dependency Injection with Initializer init(dependency: Dependency) { self.dependency = dependency } } 4 NG: Storyboard ☠ no initializer... 4 OK: XIB " 4 OK: CBL "
CBL features 4 Reusable ☺ 4 Speedy ☺ 4 Easy
to Resolve Conflict ☺ 4 Easy to Review ☺ 4 Cost of Learning " 4 Non-Visual "
StoryBoard XIB Codebased ! Segue ✅ # Visual ✅ ✅
$ Compiler Check ✅ ✅ % Testable (DI) ✅ ✅ ♻ Reusable ✅ ' Less Conflict ✅ ( Reviewable ✅
6 Tips for CBL
1. Initialization Closure 2. "Then" 3. Custom View Class 4.
lazy var 5. "SnapKit" 6. UIStackView
class ViewController: UIViewController { let priceLabel = UILabel() let imageView
= UIImageView() override func viewDidLoad() { super.viewDidLoad() priceLabel.numberOfLines = 2 priceLabel.textColor = .red priceLabel.font = .boldSystemFont(ofSize: 14) imageView.contentMode = .scaleAspectFill imageView.clipsToBounds = true imageView.layer.cornerRadius = 4 // addSubview, AutoLayout... } }
messy viewDidLoad...
1. Initialization Closure
class ViewController: UIViewController { let priceLabel: UILabel = { let
label = UILabel() label.numberOfLines = 2 label.textColor = .red label.font = .boldSystemFont(ofSize: 14) return label }() let imageView: UIImageView = { let view = UIImageView() view.contentMode = .scaleAspectFill view.clipsToBounds = true view.layer.cornerRadius = 4 return view }() override func viewDidLoad() { super.viewDidLoad() // addSubview, AutoLayout... } }
viewDidLoad is clean, but...
class ViewController: UIViewController { let priceLabel: UILabel = { //
type annotation let label = UILabel() // renaming label.numberOfLines = 2 label.textColor = .red label.font = .boldSystemFont(ofSize: 14) return label // return }() let imageView: UIImageView = { // type annotation let view = UIImageView() // renaming view.contentMode = .scaleAspectFill view.clipsToBounds = true view.layer.cornerRadius = 4 return view // return }() override func viewDidLoad() { super.viewDidLoad() // addSubview, AutoLayout... } }
2. "Then" https://github.com/devxoul/Then
class ViewController: UIViewController { let priceLabel = UILabel().then { $0.numberOfLines
= 2 $0.textColor = .red $0.font = .boldSystemFont(ofSize: 14) } let imageView = UIImageView().then { $0.contentMode = .scaleAspectFill $0.clipsToBounds = true $0.layer.cornerRadius = 4 } override func viewDidLoad() { super.viewDidLoad() // addSubview, AutoLayout... } }
3. Custom View Class
class ViewController: UIViewController { let priceLabel = PriceLabel() let imageView
= ItemImageView() override func viewDidLoad() { super.viewDidLoad() } }
private let captureButton = CaptureButton().then { $0.onTapped = { [weak
self] in self?.camera.capture() } }
private let captureButton = CaptureButton().then { $0.onTapped = { [weak
self] in // Compile Error self?.camera.capture() // Compile Error } }
4. lazy var
private lazy var captureButton = CaptureButton().then { $0.onTapped = {
[weak self] in self?.camera.capture() // OK } }
Codebased AutoLayout
NSLayoutAnchor ? // addSubview, AutoLayout... view.addSubview(button) button.leadingAnchor.constraintEqualToAnchor(view.leadingAnchor).active = true button.trailingAnchor.constraintEqualToAnchor(view.trailingAnchor).active
= true button.topAnchor.constraintEqualToAnchor(view.topAnchor).active = true button.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true
!
5. "SnapKit" https://github.com/SnapKit/SnapKit
view.addSubview(button) // button.leadingAnchor.constraintEqualToAnchor(view.leadingAnchor).active = true // button.trailingAnchor.constraintEqualToAnchor(view.trailingAnchor).active = true //
button.topAnchor.constraintEqualToAnchor(view.topAnchor).active = true // button.bottomAnchor.constraintEqualToAnchor(view.bottomAnchor).active = true button.snp.makeConstraints { $0.edges.equalToSuperview() }
// readable button.snp.makeConstraints { $0.center.equalToSuperview() $0.size.equalTo(CGSize(width: 64, height: 64)) }
// Support Safe Area tableView.snp.makeConstraints { $0.top.bottom.equalTo(view.safeAreaLayoutGuide) $0.leading.trailing.equalToSuperview() }
6. UIStackView
UIStackView = Stack "Layouted" View Less Constraints ! stackView.addArrangedSubview(label) stackView.addArrangedSubview(imageView)
stackView.addArrangedSubview(button) label.snp.makeConstraints { $0.height.equalTo(20) } button.snp.makeConstraints { $0.height.equalTo(60) }
Summary
CBL: Code-Based layout 4 Testable, Speedy, and Reusable 4 Use
"6 Tips" to clean code When to Use 4 Use CBL for simple layout 4 Use XIB for complicated layout 4 Use StoryBoard for segue