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制約のなかでContainerViewControllerを つくる方法
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Mitsuyoshi Yamazaki
September 18, 2018
Technology
5
820
制約のなかでContainerViewControllerを つくる方法
ChildViewControllerが依存しあっているような制約のもとでも、汎用のContainerViewControllerを作る方法を詳解します
Mitsuyoshi Yamazaki
September 18, 2018
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Transcript
੍ͷͳ͔Ͱ ContainerViewControllerΛ ͭ͘Δํ๏ @vespid v2.2.1
About me • Twitter: @vespid • GitHub: mitsuyoshi-yamazaki • SpeeeͰSwift։ൃ৽نࣄۀͷ
ϢʔβʔΠϯλϏϡʔͳͲ
ࡢॴଐ͍ͯͨ͠ࣄۀ෦ • iOS։ൃऀͱͯ͠ ඒ༰ΞϓϦΛ୲ • TwitterͷϓϩϑΟʔϧ ը໘ͷ࠶ݱ
͍͍ײ͡ʹOSSԽͰ͖ͨ HJUIVCDPNTQFFF 4DSPMMBCMF5BC$POUSPMMFS
Έͳ͞Μ
ᕒͷUI͕࠶ར༻Ͱ͖ͳ͍
ͱ͍͏͜ͱͳ͍Ͱ͠ΐ͏͔
ContainerViewControllerΛ ͬͨ͜ͱͷ͋Δํ ଟ͍ͱࢥ͍·͕͢
൚༻Խ͕͍͜͠ͱ
੍ͷͳ͔Ͱ ContainerViewControllerΛ ͭ͘Δํ๏ʹ͍ͭͯઆ໌͠·͢
• εΫϩʔϧʹΑͬͯ ϔομʔ͕ॖΉ • ChildVC ϔομʔͱλϒͷத ྫɿTwitter UI
Twitter UIͷ;ͨͭͷཁૉ 1.ScrollViewΛΈ߹ΘͤͨView • εΫϩʔϧͱಉظͨ͠Ξχϝʔγϣϯ 2.൚༻ContainerViewController • ChildViewControllerಉ࢜ͷಠཱΛอͭ Twitter UIΛςʔϚʹબΜͩཧ༝ɿ
Twitter UIͷ;ͨͭͷཁૉ 1.ScrollViewΛΈ߹ΘͤͨView • εΫϩʔϧͱಉظͨ͠Ξχϝʔγϣϯ 2.൚༻ContainerViewController • ChildViewControllerಉ࢜ͷಠཱΛอͭ Twitter UIΛςʔϚʹબΜͩཧ༝ɿ
੍ͷͱ൚༻Խ͢Δͷ͕͍͠
Ͳ͏ͭ͘Δ͔ʁ
ContainerViewControllerͷઃܭ • ΠϯλʔϑΣʔεΛఆٛ͢Δ • ChildViewControllerؒͷಠཱੑΛ୲อ͢Δ • ্࣮ͷ੍Λղܾ͢ΔɿࠓճScrollViewؔ࿈
ContainerViewControllerͷઃܭ • ΠϯλʔϑΣʔεΛఆٛ͢Δ • ChildViewControllerؒͷಠཱੑΛ୲อ͢Δ • ্࣮ͷ੍Λղܾ͢ΔɿࠓճScrollViewؔ࿈
ΠϯλʔϑΣʔεΛఆٛ͢Δ • ཁ • ͍͍͢ΠϯλʔϑΣʔεΛ༻ҙ͍ͨ͠ • UIKit४ڌ
ΠϯλʔϑΣʔεΛఆٛ͢Δ ϔομʔ λϒ εΫϩʔϧίϯςϯπ
ΠϯλʔϑΣʔεΛఆٛ͢Δ class ScrollableViewController: UIViewController { var scrollView: UIScrollView } class
ContainerViewController: UIViewController { var headerViewController: UIViewController // ϔομʔ var viewControllers: [ScrollableViewController] // εΫϩʔϧίϯςϯπ } εΫϩʔϧίϯςϯπScrollViewΛ͍ͬͯΔඞཁ͕͋Δ
ContainerViewControllerͷઃܭ • ΠϯλʔϑΣʔεΛఆٛ͢Δ • ChildViewControllerؒͷಠཱੑΛ୲อ͢Δ • ্࣮ͷ੍Λղܾ͢ΔɿࠓճScrollViewؔ࿈
ChildViewControllerͷ ಠཱੑΛ୲อ͢Δ • ཁ • ҙͷChildViewControllerΛѻ͍͍ͨ
class ScrollableViewController: UIViewController { var scrollView: UIScrollView } class ContainerViewController:
UIViewController { var headerViewController: UIViewController // ϔομʔ var viewControllers: [ScrollableViewController] // εΫϩʔϧίϯςϯπ } ChildViewControllerͷ ಠཱੑΛ୲อ͢Δ ѻ͑ΔChildViewControllerʹ੍ݶ͕͔͔͍ͬͯΔ
protocol Scrollable { var scrollView: UIScrollView! { get } }
class ContainerViewController: UIViewController { var headerViewController: UIViewController // ϔομʔ var viewControllers: [UIViewController & Scrollable] // εΫϩʔϧίϯςϯπ } ChildViewControllerͷ ಠཱੑΛ୲อ͢Δ ඞਢͷ੍protocolʹΓग़͢
ContainerViewControllerͷઃܭ • ΠϯλʔϑΣʔεΛఆٛ͢Δ • ChildViewControllerؒͷಠཱੑΛ୲อ͢Δ • ্࣮ͷ੍Λղܾ͢ΔɿࠓճScrollViewؔ࿈
• λϒͷίϯςϯπΛ εΫϩʔϧͰ͖Δ • ্·ͰεΫϩʔϧ͢Δͱ ࿈ଓతʹϔομʔ͕ॖΉ ScrollViewཁ݅
࣮Ҋ 1. ScrollViewΛೖΕࢠʹ͢Δ 2. εΫϩʔϧͰScrollView.frameΛߋ৽͢Δ 3. ScrollView.contentInsetΛར༻͢Δ
࣮Ҋ 1. ScrollViewΛೖΕࢠʹ͢Δ 2. εΫϩʔϧͰScrollView.frameΛߋ৽͢Δ 3. ScrollView.contentInsetΛར༻͢Δ
ScrollView.contentInsetΛ ར༻͢Δ
None
࣮
ScrollView.contentInsetΛར༻͢Δ ࣮ tabContentViewController.scrollView.contentInset.top = headerViewController.maximumHeight tabContentViewController.scrollView.observe(\.contentOffset) { (_, change) in
guard let offset = change.newValue else { return } self.headerHeightConstraint.constant = -(self.tabViewHeight + offset.y) } ContentOffsetͷมԽΛऔಘ͠ɺϔομʔߴ͞Λߋ৽
contentOffsetΛऔಘ͢ΔͳΒ scrollViewDidScroll Λ͑Α͍ͷͰ
ScrollViewDelegateΛ ར༻͠ͳ͍ཧ༝ • σϦήʔτʹઃఆͰ͖ΔΠϯελϯε ͻͱͭͳͷͰɺίϯςφଆͰར༻͢Δͱ ChildViewControllerͷσϦήʔτϝιου͕ ݺΕͳ͘ͳΔͨΊ
·ͱΊ • ΠϯλʔϑΣʔεΛઌʹߟ͑Δ • ChildViewControllerؒͷಠཱΛอͭʹ protocolΛ͏ • ScrollViewಛੑΛཧղͯ͠͏ • ChildViewControllerͷdelegateΛԣऔΓ͠ͳ͍
!WFTQJE HJUIVCDPNTQFFF4DSPMMBCMF5BC$POUSPMMFS ੍ͷͳ͔Ͱ ContainerViewControllerΛ ͭ͘Δํ๏
None
None
ิࢿྉ
ScrollView࣮ Ҋ
1. ScrollViewΛೖΕࢠʹ͢Δ
1. ScrollViewΛೖΕࢠʹ͢Δ ϔομʔ λϒ εΫϩʔϧίϯςϯπ
1. ScrollViewΛೖΕࢠʹ͢Δ • ࿈ଓͯ͠εΫϩʔϧ Ͱ͖ͳ͍
1. ScrollViewΛೖΕࢠʹ͢Δ આ໌ɿ • ͻͱͭͷScrollView͕εϫΠϓδΣενϟʔΛ ड͚औΔͱɺͦͷεΫϩʔϧ͕ऴΘΔ·Ͱ ଞͷScrollViewʹδΣενϟʔ͕·ΘΒͳ͍ͨΊ
2. εΫϩʔϧͰScrollView.frameΛ ߋ৽͢Δ
2. εΫϩʔϧͰScrollView.frameΛߋ৽͢Δ ϔομʔ λϒ εΫϩʔϧίϯςϯπ
2. εΫϩʔϧͰScrollView.frameΛߋ৽͢Δ • ʮϔομʔ͕ॖΉʯͷ͕ཁ݅ • ͦΕʮϔομʔҎ֎͕͕Δʯͱಉ͡ • εΫϩʔϧʹΑͬͯScrollView.frame.heightΛ มߋ͢Ε࣮ݱͰ͖ΔͷͰͳ͍͔ʁ
2. εΫϩʔϧͰScrollView.frameΛߋ৽͢Δ આ໌ɿ • εΫϩʔϧதʹScrollView.frame͕ߋ৽͞ΕΔͱ ʮϢʔβʔ͕৮͍ͬͯΔ(contentOffset)ʯ͕ มΘͬͯ͠·͏ • frameߋ৽ˠcontentOffsetߋ৽ˠframeߋ৽… ͷϧʔϓͰεΫϩʔϧ͕͓͔͘͠ͳΔ