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
iOSのレイアウトサイクルを知ろう
Search
Elvis Shi
May 24, 2018
Programming
3
1.9k
iOSのレイアウトサイクルを知ろう
iOS(UIKit)のレイアウトサイクルについてのお話
Elvis Shi
May 24, 2018
Tweet
Share
More Decks by Elvis Shi
See All by Elvis Shi
@Environment(\.keyPath)那么好我不允许你们不知道! / atEnvironment keyPath is so good and you should know it!
lovee
0
170
ゼロから始めるPreferenceの実装 / Let's implement Preferences from scratch
lovee
0
94
Kotlin エンジニアへ送る:Swift 案件に参加させられる日に備えて~似てるけど色々違う Swift の仕様 / from Kotlin to Swift
lovee
1
310
個人アプリを2年ぶりにアプデしたから褒めて / I just updated my personal app, praise me!
lovee
0
540
How did I build an Open-Source SwiftUI Toast Library
lovee
1
120
SwiftUIで使いやすいToastの作り方 / How to build a Toast system which is easy to use in SwiftUI
lovee
3
1.1k
SwiftUIで二重スクロール作ってみた / When I tried to make a dual-scroll-ish view in SwiftUI
lovee
1
330
Observation のあれこれ / A brief introduction about Observation
lovee
3
400
ChatGPT 時代の勉強 / Learning under ChatGPT era
lovee
27
8.8k
Other Decks in Programming
See All in Programming
AI Coding Meetup #3 - 導入セッション / ai-coding-meetup-3
izumin5210
0
3.4k
Introduce Hono CLI
yusukebe
6
2.8k
ALL CODE BASE ARE BELONG TO STUDY
uzulla
25
6.4k
品質ワークショップをやってみた
nealle
0
550
タスクの特性や不確実性に応じた最適な作業スタイルの選択(ペアプロ・モブプロ・ソロプロ)と実践 / Optimal Work Style Selection: Pair, Mob, or Solo Programming.
honyanya
3
180
What's new in Spring Modulith?
olivergierke
1
160
Six and a half ridiculous things to do with Quarkus
hollycummins
0
180
CSC305 Lecture 08
javiergs
PRO
0
240
TFLintカスタムプラグインで始める Terraformコード品質管理
bells17
2
270
実践Claude Code:20の失敗から学ぶAIペアプログラミング
takedatakashi
15
5.8k
私達はmodernize packageに夢を見るか feat. go/analysis, go/ast / Go Conference 2025
kaorumuta
2
600
テーブル定義書の構造化抽出して、生成AIでDWH分析を試してみた / devio2025tokyo
kasacchiful
0
190
Featured
See All Featured
GraphQLとの向き合い方2022年版
quramy
49
14k
Mobile First: as difficult as doing things right
swwweet
225
10k
GraphQLの誤解/rethinking-graphql
sonatard
73
11k
Building an army of robots
kneath
306
46k
Keith and Marios Guide to Fast Websites
keithpitt
411
23k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
190
55k
GitHub's CSS Performance
jonrohan
1032
470k
Optimizing for Happiness
mojombo
379
70k
RailsConf 2023
tenderlove
30
1.3k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
16
1.7k
Making the Leap to Tech Lead
cromwellryan
135
9.6k
Transcript
ϨΠΞταΠΫϧΛ Ζ͏ forαϙʔλʔζ$P-BCษڧձ K15؊
var employedBy = "YUMEMI Inc." var job = "iOS Developer"
var favoriteLanguage = "Swift" var twitter = "@lovee" var qiita = "lovee" var github = "el-hoshino" var additionalInfo = """ ࣗশ Auto Layout ઈରࡴ͢ϚϯͰ͢ """ class Me: Developable, Talkable { }
J04ʢ6*,JUʣͷϨΠΞταΠΫϧͲͷΑ͏ʹಈ͍ͯΔ͔ ͲͷλΠϛϯάͰϨΠΞτΛΈͳ͓͖͔͢ "VUP-BZPVUͰϨΠΞτΛΉ࣌ͱίʔυͰϨΠΞτ Ή࣌ʹͦΕͧΕԿΛؾΛ͚ͭΔ͖͔ /PU"VUP-BZPVUͷ͍ܰએʢΛ͍ͤͯͩ͘͞͞Xʣ ࠓ͢͜ͱ
͜ͷϨΠΞτ۩ମతʹͲͷΑ͏ʹΜͰ͍Δͷ͔ έʔεόΠέʔε͗͢ΔͷͰΧόʔ͢Δͷແཧ Ͱฉ͖͍ͨͷ͋Ε࣭ٙԠ࠙ձͷ࣌ʹରԠ͍ͨ͠ "VUP-BZPVUͷΈ ڵຯֶ͋ͬͯಘҙͳϑϨϯζੋඇҴݟ͞ΜͷൃදΛ IUUQTXXXZPVUVCFDPNXBUDI W5)0OTZ%,&:2UT ࠓ͞ͳ͍͜ͱ
ੲͷ iPhone ղ૾͕ 1 छྨ͔͠ͳ͘ɺ ը໘ϨΠΞτ͕ͱͯ؆୯ͩͬͨɻ
UIView ͷੜ࣌ʹ frame Λࢦఆ͠ɺ ϨΠΞτͷมԽߟ͑ͳͯ͘Α͔ͬͨɻ ը໘ճస͕ແޮͳΒ let view = UIView(frame:
CGRect(x: 0, ɹɹy: 0, ɹɹwidth: 320, ɹɹheight: 480)) Swiftɿ UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)]; Objective-Cɿ
్த͔Βը໘छྨ͕૿͑ɺ ϨΠΞτ͕໘ʹͳΓ࢝Ίͨɻ
ࠓछྨ͕ଟ͗ͯ͢ɺ ԿΛͲ͏͢Ε͍͍͔… ?
ϨΠΞτ αΠΫϧ
ϨΠΞτίετ͕ߴ͍ʢॏ͍ʣ ͳΔ͘ϨΠΞτΛඞཁͳ࣌ʹඞཁ࠷ݶ͚ͩߦ͍͍ͨ ҙਤ͠ͳ͍ॴͰ࠶ϨΠΞτΛىͤͨ͘͜͞ͳ͍ ϨΠΞτΛࢥ͏Ͳ͓Γʹ࣮ݱ͢Δͷʹඞཁ ϨΠΞτઃఆͯ͠Δ͚ͲɺαΠΫϧ͕ճΒͳ͔͍ͬͨͤ Ͱݟ͕ͨఆͱҧ͏͜ͱΛ͍͗ͨ ͳͥϨΠΞταΠΫϧ͕ॏཁ͔
UIViewController UIView viewDidDisappear() viewWillDisappear() layout runloop viewDidAppear() viewDidLayoutSubviews() layoutSubviews() viewWillLayoutSubviews()
viewWillAppear() viewDidLoad() loadView()
UIViewController UIView Needs layout? viewDidLayoutSubviews() layoutSubviews() updateViewConstraints() updateConstraints() yes no
Needs update constraint? viewWillLayoutSubviews() yes sleep no Needs layout? no yes Disappear? viewDidDisappear() viewWillDisappear() layout runloop viewDidAppear() viewDidLayoutSubviews() layoutSubviews() viewWillLayoutSubviews() viewWillAppear() viewDidLoad() loadView()
setNeedsLayout() Λݺͼग़ͨ͠ σόΠε͕ճసͨ͠ ࢠϏϡʔΛՃআΛͨ͠ ࣗͷϏϡʔ֊ͷ੍͕ߋ৽ͨ͠ ʢUIScrollView Ͱ͋ΔࢠϏϡʔʣ͕εΫϩʔϧͨ͠ ࣗͷࢠϏϡʔͷ frame
transform ͳͲ͕มߋ͞Εͨ ͳͲͳͲ… Ͳ͏ͬͯఆ͍ͯ͠Δͷ͔ʁ Needs layout?
setNeedsLayout() Λݺͼग़ͨ͠ σόΠε͕ճసͨ͠ ࢠϏϡʔΛՃআΛͨ͠ ࣗͷϏϡʔ֊ͷ੍͕ߋ৽ͨ͠ ʢUIScrollView Ͱ͋ΔࢠϏϡʔʣ͕εΫϩʔϧͨ͠ ࣗͷࢠϏϡʔͷ frame
transform ͳͲ͕มߋ͞Εͨ ͳͲͳͲ… Ͳ͏ͬͯఆ͍ͯ͠Δͷ͔ʁ Needs layout? ࣗͷ frame transform ඞͣʹมߋͯ͠Β͓͏ʂ ࣗͷ frame transform Λมߋ͢Ε ͷ layoutSubviews() ݺΕΔʂ
setNeedsLayout() Λݺͼग़ͨ͠ σόΠε͕ճసͨ͠ ࢠϏϡʔΛՃআΛͨ͠ ࣗͷϏϡʔ֊ͷ੍͕ߋ৽ͨ͠ ʢUIScrollView Ͱ͋ΔࢠϏϡʔʣ͕εΫϩʔϧͨ͠ ࣗͷࢠϏϡʔͷ frame
transform ͳͲ͕มߋ͞Εͨ ͳͲͳͲ… Ͳ͏ͬͯఆ͍ͯ͠Δͷ͔ʁ Needs layout? ࠶ϨΠΞτ setNeedsLayout ͷ ޙͰͳ͘ɺ࣍ͷϥϯϧʔϓ ϨΠΞτίετ͕ߴ͍ ͘͠ layoutIfNeeded ݺͼग़࣌͠
Ͳ͏ϨΠΞτ ͢Ε͍͍͔
جຊUIViewͷlayoutSubviewsΛΦʔόʔϥΠυ͠ɺͦ ͷதͰϨΠΞτ͢Ε͍͍ ϏϡʔͷframeϓϩύςΟʔɺ͕ཧ͖͢ ༰ʹԠͯ͡αΠζ͕มΘΔϏϡʔɺsizeThatFitsͰ ͳΜͱ͔ͳΔ label.frame.size = label.sizeThatFits(bounds.size) ඞཁʹԠͯ͡ΦʔόʔϥΠυՄ ࠶ϨΠΞτ͕ඞཁʹͳͬͨΒsetNeedsLayoutΛݺͿ
ϨΠΞτ͕ඞཁͱ͍͏ϑϥάཱ͕͚ͭͩͳͷͰɺҰͷ ॲཧʹෳճݺΜͰϨΠΞτޙͰҰճ͚ͩճΔ ίʔυʢ"VUP-BZPVUͳ͠ʣͰΉ߹
ίʔυʢ"VUP-BZPVUͳ͠ʣͰΉ߹ class ViewController: UIViewController { lazy var myView = View(frame:
UIScreen.main.bounds) override func loadView() { self.view = self.myView } override func viewDidLoad() { super.viewDidLoad() self.myView.button.addTarget(self, action: #selector(self.switchButtonSize), for: .touchUpInside) } @objc func switchButtonSize() { self.myView.showsLargeButton = !self.myView.showsLargeButton self.view.setNeedsLayout() } } class View: UIView { let button = UIButton() var showsLargeButton = false override func layoutSubviews() { if showsLargeButton { self.button.frame = self.bounds } else { self.button.frame.size = .init(width: 100, height: 100) self.button.frame.origin = .zero } } }
ίʔυʢ"VUP-BZPVUͳ͠ʣͰΉ߹ class ViewController: UIViewController { lazy var myView = View(frame:
UIScreen.main.bounds) override func loadView() { self.view = self.myView } override func viewDidLoad() { super.viewDidLoad() self.myView.button.addTarget(self, action: #selector(self.switchButtonSize), for: .touchUpInside) } @objc func switchButtonSize() { self.myView.showsLargeButton = !self.myView.showsLargeButton self.view.setNeedsLayout() } } class View: UIView { let button = UIButton() var showsLargeButton = false override func layoutSubviews() { if showsLargeButton { self.button.frame = self.bounds } else { self.button.frame.size = .init(width: 100, height: 100) self.button.frame.origin = .zero } } }
"VUP-BZPVUͰΉ߹ class ViewController: UIViewController { lazy var button: UIButton =
{ let button = UIButton() button.translatesAutoresizingMaskIntoConstraints = false button.addTarget(self, action: #selector(self.switchButtonSize), for: .touchUpInside) return button }() var showsLargeButton = false lazy var top = button.topAnchor.constraint(equalTo: view.topAnchor) lazy var left = button.leftAnchor.constraint(equalTo: view.leftAnchor) lazy var bottom = button.bottomAnchor.constraint(equalTo: view.bottomAnchor) lazy var right = button.rightAnchor.constraint(equalTo: view.rightAnchor) lazy var width = button.widthAnchor.constraint(equalToConstant: 100) lazy var height = button.heightAnchor.constraint(equalToConstant: 100) override func viewDidLoad() { super.viewDidLoad() self.view.addSubview(button) self.view.setNeedsUpdateConstraints() } override func updateViewConstraints() { self.updateButtonConstraints() super.updateViewConstraints() } @objc func switchButtonSize() { self.showsLargeButton = !self.showsLargeButton self.updateButtonConstraints() } func updateButtonConstraints() { top.isActive = true left.isActive = true if showsLargeButton { bottom.isActive = true right.isActive = true width.isActive = false height.isActive = false } else { bottom.isActive = false right.isActive = false width.isActive = true height.isActive = true } } }
"VUP-BZPVUͰΉ߹ @objc func switchButtonSize() { self.showsLargeButton = !self.showsLargeButton self.updateButtonConstraints() }
func updateButtonConstraints() { top.isActive = true left.isActive = true if showsLargeButton { bottom.isActive = true right.isActive = true width.isActive = false height.isActive = false } else { bottom.isActive = false right.isActive = false width.isActive = true height.isActive = true } }
ϨΠΞτʢʹݶΒͣ6*ܥશൠʣϝΠϯεϨουͰʂ ϨΠΞταΠΫϧͰϨΠΞτҾ͖ى͜͞ͳ͍ setNeedsLayoutsetNeedsUpdateConstraintsΛ ݺͳ͍ ϨΠΞταΠΫϧͷݺͼग़͠ΛͳΔ͘࠷খݶʹ ࢠϏϡʔͷՃͳΔ͘viewDidLoad͔ viewWillLayoutSubviewsʹ layoutIfNeededΛΉΈʹݺͳ͍ ຊʹඞཁͳ͚࣌ͩݺͿ ҙʢڞ௨ʣ
ΞχϝʔγϣϯϒϩοΫͱ͔
sizeThatFitsΛ͏·͘׆༻͠ɺϨΠΞτॲཧΛ࠷খݶʹ ͑Δ sizeThatFitsͷΦʔόʔϥΠυ͢Δ࣌ʹɺதͰͳΔ͘ ϨΠΞτॲཧͤ͞ͳ͍ ࣗࣗͰࣗࣗͷframeΛมߋ͠ͳ͍ʂ ҙʢίʔυʣ
ϏϡʔؔΛ͏·͘׆༻੍ͯ͠ΛΉ ؔੑΛਖ਼͘͠ઃఆͰ͖ͯΕsetNeedsLayout(); layoutIfNeeded()ͷίϯϘཁΒͳ͍ͣʂ ੍ͷߋ৽සΛͳΔ͘࠷খݶʹ ՄೳͳݶΓ੍Λੜʗআ͢ΔͷͰͳ͘ɺಉ੍͡ Λྲྀ༻͠constantsΛมߋ͢Δ͔ɺ੍ΛisActiveͰ Γସ͑Δ isActiveͰΓସ͑Δ߹੍ͷอ࣋ʹҙ ίϯςϯπʹԠͨ͡αΠζઃఆintrinsicContentSize ΛΦʔόʔϥΠυ
ҙʢ"VUP-BZPVUʣ
એ
/PU"VUP-BZPVUઈࢍެ։த IUUQTHJUIVCDPNFMIPTIJOP/PU"VUP-BZPVU
ίʔυʢ/PU"VUP-BZPVUʣͰΉ߹ class ViewController: UIViewController { lazy var myView = View(frame:
UIScreen.main.bounds) override func loadView() { self.view = self.myView } override func viewDidLoad() { super.viewDidLoad() self.myView.button.addTarget(self, action: #selector(self.switchButtonSize), for: .touchUpInside) } @objc func switchButtonSize() { self.myView.showsLargeButton = !self.myView.showsLargeButton self.view.setNeedsLayout() } } class View: UIView { let button = UIButton() var showsLargeButton = false override func layoutSubviews() { if showsLargeButton { self.nal.layout(button, by: { $0.stickOnParent() }) } else { self.nal.layout(button, by: { $0 .setTopLeft(by: { $0.topLeft }) .setSize(to: .init(width: 100, height: 100)) }) } } }
J04ΞϓϦઃܭύλʔϯೖࣥචܾఆ IUUQTQFBLTDDJ04@BSDIJUFDUVSF
גࣜձࣾΏΊΈɺΤϯδχΞืूத IUUQTXXXZVNFNJDPKQKBQBHFSFDSVJU