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入門 SwiftUI Alignment Guide / iOSDC2022
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monoqlo
September 11, 2022
Technology
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5.7k
入門 SwiftUI Alignment Guide / iOSDC2022
iOSDC Japan 2022 2022/09/11
monoqlo
September 11, 2022
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Transcript
@monoqloʢͷ͘Ζʣ ೖSwiftUI Alignment Guide iOSDC Japan 2022
͡Ίʹ
• ʮೖʯͱ͋ΔΑ͏ʹϝΠϯλʔήοτSwiftUIॳ৺ऀͰ͢ • ۩ମతʹŋŋŋ • alignmentGuide(_:computeValue:) ͬͨ͜ͱͳ͍ • Custom Alignment
Guideͬͨ͜ͱͳ͍ • ͬͨ͜ͱ͋Δ͚ͲΑ͘Θ͔Βͳ͔ͬͨ ॳ৺ऀ͚ͷτʔΫͰ͢
• 2,3લ͔ͬ͢Β͔ΜͩͬͨެࣜυΩϡϝϯτ… • ͍ͭͷ·ʹ͔େॆ࣮ • ࠷ֶۙͼ࢝ΊͨਓٯʹΑ͍ͬͯ͘ΔՄೳੑ😇 • ਖ਼͜ͷτʔΫͷඞཁੑΛٙ͏΄ͲΊͪΌͪ͘Όྑ͍ࢿྉ • ͔͍ͭ·ΜͰҾ༻ͭͭ͠ղઆ
• εϥΠυͷ࠷ޙʹࢀߟจݙͱͯ͠URLهࡌ ࠷ۙͷެࣜυΩϡϝϯτେॆ࣮
ୈষ Alignment Guideͱ
ྫ
HStack { VStack { Rectangle() .fill(.blue) .frame(width: 100, height: 400)
Text("Long Blue Bar") .font(.title) } VStack { Rectangle() .fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar") .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } }
None
ղྫ
HStack { VStack { Rectangle() .fill(.blue) .frame(width: 100, height: 400)
Text("Long Blue Bar") .font(.title) } VStack { Rectangle() .fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar") .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } }
HStack(alignment: .bottom) { VStack { Rectangle() .fill(.blue) .frame(width: 100, height:
400) Text("Long Blue Bar") .font(.title) } VStack { Rectangle() .fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar") .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } }
ղઆ
VStack { Text("Hello,") Text("😺🐶🐢🐰🐳") Text("Animals!") }
VStack { Text("Hello,") Text("😺🐶🐢🐰🐳") Text("Animals!") }
VStack { Color.white.frame(width: 1) Text("Hello,") Text("😺🐶🐢🐰🐳") Text(“Animals!") Color.white.frame(width: 1) }
VStack(alignment: .center) { Color.white.frame(width: 1) Text("Hello,") Text("😺🐶🐢🐰🐳") Text(“Animals!") Color.white.frame(width: 1)
}
VStack(alignment: .leading) { Color.white.frame(width: 1) Text("Hello,") Text("😺🐶🐢🐰🐳") Text(“Animals!") Color.white.frame(width: 1)
}
VStack(alignment: .leading) { Color.white.frame(width: 1) Text("Hello,") Text("😺🐶🐢🐰🐳") Text(“Animals!") Color.white.frame(width: 1)
} .environment(\.layoutDirection, .rightToLeft)
Built-in Alignment Guides
HorizontalAlignment • leading • center • trailing • listRowSeparatorLeading •
listRowSeparatorTrailing Built-in Alignment Guides VerticalAlignment • top • center • bottom • fi rstTextBaseline • lastTextBaseline
HorizontalAlignment • leading • center • trailing • (listRowSeparatorLeading) •
(listRowSeparatorTrailing) Built-in Alignment Guides
VerticalAlignment • top • center • bottom • fi rstTextBaseline
• lastTextBaseline Built-in Alignment Guides
Alignment HorizontalAlignment × VerticalAlignment Built-in Alignment Guides https://developer.apple.com/documentation/swiftui/alignment
Built-in Alignment Guides
Custom Alignment Guide
ୈষ alignmentGuide(_:computeValue:)
ྫ
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } Color.white.frame(width: 1) }
None
None
ղྫ
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", “Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
ղઆ
alignmentGuide(_:computeValue:)
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) func alignmentGuide( _ g: VerticalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat ) -> some View https://developer.apple.com/documentation/swiftui/view/alignmentguide(_:computevalue:)-6y3u2 https://developer.apple.com/documentation/swiftui/view/alignmentguide(_:computevalue:)-9mdoh
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ج४ͱͳΔAlignment͔ΒͷҐஔΛௐͰ͖ΔViewModi fi er
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ج४ͱͳΔAlignment͔ΒͷҐஔΛௐͰ͖ΔViewModi fi er • ୈ1Ҿ͕ج४ͱͳΔAlignment e.g. VStack(alignment: .leading) ͷதʹೖ͍ͬͯΔViewΛௐ ͍ͨ͠ͳΒ .leading Λࢦఆ
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Circle() .fill(Color.green) .frame(width: 50, height: 50) Color.white.frame(width: 1) }
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ • ҾͷViewDimensions͔Βར༻Ͱ͖Δͷ
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ • ҾͷViewDimensions͔Βར༻Ͱ͖Δͷ • Viewͷwidth, height • ֤Alignment GuideҐஔʢoffsetʣ
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ • ҾͷViewDimensions͔Βར༻Ͱ͖Δͷ • Viewͷwidth, height • ֤Alignment GuideҐஔʢoffsetʣ
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ • ҾͷViewDimensions͔Βར༻Ͱ͖Δͷ • Viewͷwidth, height • ֤Alignment GuideҐஔʢoffsetʣ
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) } 🤔* 2ʁ
🤔* 2ʁ
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐ͢Δʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ طଘͷΘΓʹ
ϓϨʔϯͳঢ়ଶ == 0 VStack(alignment: .trailing) ˞Πϝʔδ
.trailingͷσϑΥϧτ ϓϨʔϯͳঢ়ଶ == 0 VStack(alignment: .trailing) ˞Πϝʔδ
.trailingͷσϑΥϧτ .alignmentGuide(.trailing) { context in context.width * 2 }
.trailingͷσϑΥϧτ .alignmentGuide(.trailing) { context in context.width * 2 } طଘΛஔ͖͑Δ
.trailingͷσϑΥϧτ .alignmentGuide(.trailing) { context in context.width * 2 } طଘΛஔ͖͑Δ
.trailingͷσϑΥϧτ ͷҐஔ͔Β Ҡಈ͢Δ༁Ͱͳ͍
ϓϨʔϯͳঢ়ଶ == 0 .alignmentGuide(.trailing) { context in context.width * 2
} ˞Πϝʔδ
context.width * 2 ϓϨʔϯͳঢ়ଶ == 0 .alignmentGuide(.trailing) { context in
context.width * 2 } ˞Πϝʔδ
🙅 .trailingͷσϑΥϧτ ͔Β context.width * 2 ͣΒ͢ .alignmentGuide(.trailing) { context
in context.width * 2 } 🙆 .trailingͷσϑΥϧτ ͔Β context.width * 2 ʹஔ͖͑Δ VStack(alignment: .trailing)
func alignmentGuide( _ g: HorizontalAlignment, computeValue: @escaping (ViewDimensions) -> CGFloat
) -> some View alignmentGuide(_:computeValue:) • ୈ2Ҿͷclosure • ௐͨ͠ʢج४Ґஔ͔ΒͲΕ͘Β͍ͣΒ͔͢ʣΛฦ͢ • ҾͷViewDimensions͔Βར༻Ͱ͖Δͷ • Viewͷwidth, height • ֤Alignment GuideҐஔʢoffsetʣ
subscript(guide: VerticalAlignment) -> CGFloat { get } subscript(guide: HorizontalAlignment) ->
CGFloat { get } ViewDimensions https://developer.apple.com/documentation/swiftui/viewdimensions subscript(explicit guide: VerticalAlignment) -> CGFloat? { get } subscript(explicit guide: HorizontalAlignment) -> CGFloat? { get }
subscript(guide: VerticalAlignment) -> CGFloat { get } subscript(guide: HorizontalAlignment) ->
CGFloat { get } ViewDimensions https://developer.apple.com/documentation/swiftui/viewdimensions subscript(explicit guide: VerticalAlignment) -> CGFloat? { get } subscript(explicit guide: HorizontalAlignment) -> CGFloat? { get }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } == 0 == context.width
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.trailing)
{ context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } ˞ VStackͰ.leading͕ࢦఆ͞Ε͍ͯͳ͍ͷͰɺ ͜Ε୯ମͰϨΠΞτʹӨڹͳ͍
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } != 0
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } == 100
subscript(guide: VerticalAlignment) -> CGFloat { get } subscript(guide: HorizontalAlignment) ->
CGFloat { get } ViewDimensions https://developer.apple.com/documentation/swiftui/viewdimensions subscript(explicit guide: VerticalAlignment) -> CGFloat? { get } subscript(explicit guide: HorizontalAlignment) -> CGFloat? { get }
subscript(guide: VerticalAlignment) -> CGFloat { get } subscript(guide: HorizontalAlignment) ->
CGFloat { get } ViewDimensions https://developer.apple.com/documentation/swiftui/viewdimensions subscript(explicit guide: VerticalAlignment) -> CGFloat? { get } subscript(explicit guide: HorizontalAlignment) -> CGFloat? { get }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[.leading] } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } มԽͳ͠
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ .alignmentGuide(.leading)
{ _ in 100 } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } มԽͳ͠ != nil == 100
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ //
.alignmentGuide(.leading) { _ in // 100 // } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ //
.alignmentGuide(.leading) { _ in // 100 // } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ //
.alignmentGuide(.leading) { _ in // 100 // } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) }
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) // লུ //
.alignmentGuide(.leading) { _ in // 100 // } .alignmentGuide(.trailing) { context in if context.width < 120 { return context[explicit: .leading] ?? -50 } else if context.width < 180 { return context[.trailing] } else { return -50 } } Color.white.frame(width: 1) } == nil
subscript(guide: VerticalAlignment) -> CGFloat { get } subscript(guide: HorizontalAlignment) ->
CGFloat { get } ViewDimensions https://developer.apple.com/documentation/swiftui/viewdimensions subscript(explicit guide: VerticalAlignment) -> CGFloat? { get } subscript(explicit guide: HorizontalAlignment) -> CGFloat? { get } σϑΥϧτɾஔ͖͑ΒΕͨΛऔಘ ஔ͖͑ΒΕͨΛऔಘʢஔ͖͑ΒΕ͍ͯͳ͍߹ nilʣ
💡tips
cf. https://developer.apple.com/documentation/swiftui/view/alignmentguide(_:computevalue:)-9mdoh Changing the alignment of one view may have
effects on surrounding views.
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in // লུ } Color.white.frame(width: 1) } .frame(maxHeight: 500) .border(.white)
VStack(alignment: .trailing, spacing: 20) { Color.red.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in // লུ } Color.red.frame(width: 1) } .frame(maxHeight: 500) .border(.white)
VStack(alignment: .trailing, spacing: 20) { Color.red.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in // লུ } Color.red.frame(width: 1) } .frame(maxHeight: 500) .border(.white)
֎ଆͷStackͷframe͕มԽ͠͏Δ
☕ offset(x:y:)
func offset( x: CGFloat = 0, y: CGFloat = 0
) -> some View offset(x:y:) https://developer.apple.com/documentation/swiftui/view/offset(x:y:) • ViewΛਫฏ/ਨํʹҠಈ͢ΔViewModi fi er
VStack { Text("🐶") Text("🐱") Text("🐰") }
VStack { Text("🐶") Text("🐱") .offset(x: 50, y: 100) Text("🐰") }
cf. https://developer.apple.com/documentation/swiftui/view/offset(x:y:) Use offset(x:y:) to shift the displayed contents by
the amount speci fi ed in the x and y parameters. The original dimensions of the view aren’t changed by offsetting the contents.
VStack(spacing: 20) { Text("🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰") Text("Offset by passing horizontal & vertical
distance") .border(Color.green) .padding() } .border(.red) offset(x:y:)
VStack(spacing: 20) { Text("🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰") Text("Offset by passing horizontal & vertical
distance") .border(Color.green) .offset(x: 20, y: 50) .border(Color.gray) .padding() } .border(.red) offset(x:y:)
VStack(spacing: 20) { Text("🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰") Text("Offset by passing horizontal & vertical
distance") .border(Color.green) .offset(x: 20, y: 50) .border(Color.gray) .padding() } .border(.red) offset(x:y:)
VStack(spacing: 20) { Text("🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰") Text("Offset by passing horizontal & vertical
distance") .border(Color.green) .offset(x: 20, y: 50) .border(Color.gray) .padding() } .border(.red) offset(x:y:)
VStack(spacing: 20) { Text("🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰🐰") Text("Offset by passing horizontal & vertical
distance") .border(Color.green) .offset(x: 20, y: 50) .border(Color.gray) .padding() } .border(.red) offset(x:y:)
alignmentGuide(_:computeValue:) vs. offset(x:y:)
alignmentGuide(_:computeValue:)
alignmentGuide(_:computeValue:) offset(x:y:)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.orange) .offset(x: 20, y: 50) .border(Color.pink) .offset(x: 20, y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.orange) .offset(x: 20, y: 50) .border(Color.pink) .offset(x: 20, y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.orange) .offset(x: 20, y: 50) .border(Color.pink) .offset(x: 20, y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.orange) .offset(x: 20, y: 50) .border(Color.pink) .offset(x: -20, y: 50) .border(Color.gray)
Text("Offset by passing horizontal & vertical distance") .border(Color.green) .offset(x: 20,
y: 50) .border(Color.orange) .offset(x: 20, y: 50) .border(Color.pink) .offset(x: -20, y: 50) .border(Color.gray)
ୈষ Custom Alignment Guide
ྫ
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle() .fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢") .font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”) .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText") .font(.title) Color.white.frame(height: 1) }
None
ղྫ
extension VerticalAlignment { private struct BlueBarTitleAlignment: AlignmentID { static func
defaultValue(in context: ViewDimensions) -> CGFloat { context[.bottom] } } static let blueBarTitleAlignment = VerticalAlignment( BlueBarTitleAlignment.self ) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .blueBarTitleAlignment) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text("🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text("Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .blueBarTitleAlignment) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) .alignmentGuide(.blueBarTitleAlignment) { context in context[.firstTextBaseline] } } VStack { Text("🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar").font(.title) .alignmentGuide(.blueBarTitleAlignment) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1") .font(.caption) } Text("Side\nText").font(.title) Color.white.frame(height: 1) }
ղઆ
Take 1
Built-in Alignment Guides
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle() .fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢") .font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”) .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText") .font(.title) Color.white.frame(height: 1) }
HStack(alignment: .firstTextBaseline) { Color.white.frame(height: 1) VStack { Rectangle() .fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢") .font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”) .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText") .font(.title) Color.white.frame(height: 1) }
HStack(alignment: .firstTextBaseline) { Color.white.frame(height: 1) VStack { Rectangle() .fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢") .font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”) .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText") .font(.title) Color.white.frame(height: 1) }
HStack(alignment: .firstTextBaseline) { Color.white.frame(height: 1) VStack { Rectangle() .fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text(“🐰🐢") .font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”) .font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text(“Side\nText") .font(.title) Color.white.frame(height: 1) } ࣮ݱ͍ͨ͠ϨΠΞτ
Take 2
alignmentGuide(_:computeValue:)
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar”).font(.title) } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar").font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar").font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) } มԽͳ͠
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack(alignment: .center) { Rectangle().fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar").font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } } VStack(alignment: .center) { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) } มԽͳ͠
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack(alignment: .center) { Rectangle().fill(.blue) .frame(width:
100, height: 400) Text("Long Long Long Blue Bar").font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } } VStack(alignment: .center) { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) } มԽͳ͠
Built-in Alignment Guides + alignmentGuide(_:computeValue:) StackΛ·͍ͨͰViewΛἧ͑Δ͜ͱͰ͖ͳ͍
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar”).font(.title) } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1").font(.caption) } Text(“Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar").font(.title) } .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1").font(.caption) } .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } Text(“Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar").font(.title) } .alignmentGuide(.bottom) { context in context[.firstTextBaseline] } VStack { Text(“🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1").font(.caption) } .alignmentGuide(.bottom) { context in ???????????????? } Text(“Side\nText").font(.title) Color.white.frame(height: 1) } ̎ͭͷςΩετʹἧ͑Δͪΐ͏Ͳྑ͍ΛฦͤΔ…ʁ
Take 3
Custom Alignment Guide
protocol AlignmentID
public protocol AlignmentID { static func defaultValue(in context: ViewDimensions) ->
CGFloat }
public protocol AlignmentID { static func defaultValue(in context: ViewDimensions) ->
CGFloat } HStackͳͲͰࢦఆͨ͠ࡍͷσϑΥϧτ
private struct BlueBarTitleAlignment: AlignmentID { static func defaultValue(in context: ViewDimensions)
-> CGFloat { context[.bottom] } }
extension VerticalAlignment { private struct BlueBarTitleAlignment: AlignmentID { static func
defaultValue(in context: ViewDimensions) -> CGFloat { context[.bottom] } } static let blueBarTitleAlignment = VerticalAlignment( BlueBarTitleAlignment.self ) }
HStack(alignment: .bottom) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text("🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1”) .font(.caption) } Text("Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .blueBarTitleAlignment) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) } VStack { Text("🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar”).font(.title) Text("iOSDC 2022 sample code #1") .font(.caption) } Text("Side\nText").font(.title) Color.white.frame(height: 1) }
HStack(alignment: .blueBarTitleAlignment) { Color.white.frame(height: 1) VStack { Rectangle().fill(.blue) .frame(width: 100,
height: 400) Text("Long Long Long Blue Bar") .font(.title) .alignmentGuide(.blueBarTitleAlignment) { context in context[.firstTextBaseline] } } VStack { Text("🐰🐢").font(.title) Rectangle().fill(.blue) .frame(width: 150, height: 200) Text("Short Blue Bar").font(.title) .alignmentGuide(.blueBarTitleAlignment) { context in context[.firstTextBaseline] } Text("iOSDC 2022 sample code #1") .font(.caption) } Text("Side\nText").font(.title) Color.white.frame(height: 1) }
• StackΛލ͍ͰViewΛἧ͍͑ͨ Custom Alignment Guide ͷ͍ॴ
• StackΛލ͍ͰViewΛἧ͍͑ͨ • alignmentGuide(_:computeValue:) Λ͍ճ͍ͨ͠ • ViewDimentionsͷ͚ͩͰܭࢉͰ͖Δ߹ Custom Alignment Guide
ͷ͍ॴ
VStack(alignment: .trailing, spacing: 20) { Color.white.frame(width: 1) ForEach(["Dog", "Crocodile", "Horse",
"Rhinoceros"], id: \.self) { Text($0) .font(.largeTitle) .padding() .background(Color.green) } .alignmentGuide(.trailing) { context in context.width * 2 } Color.white.frame(width: 1) }
Stack × Custom Alignment Guide ͷ ੍
None
̎ϲॴἧ͑
۠Γઢ
None
VStack(alignment: .profileListRowTextAlignment, spacing: 8) { // লུ HStack(spacing: 24) {
Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .font(.caption) Text("1234567890") .font(.caption) } // লུ }
VStack(alignment: .profileListRowTextAlignment, spacing: 8) { // লུ HStack(spacing: 24) {
Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .font(.caption) Text("1234567890") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] - 30 } } // লུʢଞͷTextʹalignmentGuideΛ༩ʣ }
VStack(alignment: .profileListRowTextAlignment, spacing: 8) { // লུ HStack(spacing: 24) {
Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .font(.caption) Text("1234567890") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] - 30 } } // লུʢଞͷTextʹalignmentGuideΛ༩ʣ }
VStack(alignment: .profileListRowTextAlignment, spacing: 8) { // লུ HStack(spacing: 24) {
Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] } Text("1234567890") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] - 30 } } // লུʢଞͷTextʹalignmentGuideΛ༩ʣ }
VStack(alignment: .profileListRowTextAlignment, spacing: 8) { // লུ HStack(spacing: 24) {
Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] } Text("1234567890") .font(.caption) .alignmentGuide(.profileListRowTextAlignment) { $0[.leading] - 30 } } // লུʢଞͷTextʹalignmentGuideΛ༩ʣ } ͦΕͧΕ͕HStack͝ͱҠಈͤ͞ΔͷͰἧΘͳ͍…
• ಉ͡StackͷෳͷViewΛἧ͑ΒΕͳ͍ • ج४ͱͳΔ1ͭͷAlignmentʹରͯ͠ରͷViewΛؚΉStack શମͷҐஔΛௐ͢ΔΈͷͨΊ Stack × Custom Alignment Guide
ͷ੍
☕ Grid
VStack { SpeakerHeader() Grid(alignment: .leading, verticalSpacing: 8) { Divider() GridRow
{ Text("ϫΠϯΤΩεύʔτೝఆ൪߸") .lineLimit(1) .font(.caption) Text("1234567890") .font(.caption) } Divider() GridRow { Text("໊લ") .font(.caption) Text("monoqlo") .font(.caption) } GridRow { Text("ి൪߸") .font(.caption) Text("XXX-XXXX-XXXXX") .font(.caption) } } } .padding() .overlay( RoundedRectangle(cornerRadius: 8) .stroke(.gray) ) https://developer.apple.com/documentation/swiftui/grid
☕ • frame(width:height:alignment:) • frame(minWidth:idealWidth:maxWidth:minHeight:ide alHeight:maxHeight:alignment:)
HStack { Image("monoqloIcon") .resizable() .frame(width: 50, height: 50) .clipShape(Circle()) HStack
{ VStack(alignment: .leading) { Text("monoqlo") .font(.headline) Text("iOSDC 2022") .font(.body) } } .border(.gray) Image(systemName: "heart") .foregroundColor(.pink) .padding() .border(.gray) } .frame(width: 300) .padding() .border(.green)
HStack { Image("monoqloIcon") .resizable() .frame(width: 50, height: 50) .clipShape(Circle()) HStack
{ VStack(alignment: .leading) { Text("monoqlo") .font(.headline) Text("iOSDC 2022") .font(.body) } .frame(maxWidth: .infinity, alignment: .leading) } .border(.gray) Image(systemName: "heart") .foregroundColor(.pink) .padding() .border(.gray) } .frame(width: 300) .padding() .border(.green)
Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022 ⭐ """) .border(.red)
Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022 ⭐ """) .border(.red)
.frame(alignment: .bottom)) .border(.white)
Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022 ⭐ """) .border(.red)
.alignmentGuide(.bottom) { $0[.firstTextBaseline] } .frame(alignment: .bottom)) .border(.white)
VStack { Text("top") Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022
⭐ """) .border(.red) Text("bottom") }
VStack { Text("top") Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022
⭐ """) .border(.red) Text("bottom") } .frame(height: 200, alignment: .init(horizontal: .center, vertical: .frameTextAlignment)) .border(.white)
VStack { Text("top") Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022
⭐ """) .border(.red) Text("bottom") } .frame(height: 200, alignment: .init(horizontal: .center, vertical: .frameTextAlignment)) .border(.white) private extension VerticalAlignment { struct FrameTextAlignment: AlignmentID { static func defaultValue(in context: ViewDimensions) -> CGFloat { context[.bottom] } } static let frameTextAlignment = VerticalAlignment( FrameTextAlignment.self ) }
VStack { Text("top") Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022
⭐ """) .border(.red) Text("bottom") } .frame(height: 200, alignment: .init(horizontal: .center, vertical: .frameTextAlignment)) .border(.white)
VStack { Text("top") Text(""" ⭐ monoqlo ⭐ ⭐ iOSDC 2022
⭐ """) .border(.red) .alignmentGuide(.frameTextAlignment) { $0[.firstTextBaseline] } Text("bottom") } .frame(height: 200, alignment: .init(horizontal: .center, vertical: .frameTextAlignment)) .border(.white)
🤔 alignmentGuide(_:computeValue:) vs. offset(x:y:)
alignmentGuide(_:computeValue:) offset(x:y:)
alignmentGuide(_:computeValue:) offset(x:y:) ※ Stackͷalignmentʹରͯͬͨ࣌͠
• frame(alignment:) • frame(minWidth:idealWidth:maxWidth:minHeight:idealHeight: maxHeight:alignment:) + alignmentGuide(_:computeValue:)
Alignment Guide ೖͰ͖ͨͰ͠ΐ͏͔ʁ
ࣗݾհ
@monoqloʢͷ͘Ζʣ • 2લ͔ΒϦΫϧʔτͷਓ • ελσΟαϓϦENGLISH୲
None
None
None
Appendix
• Alignment • https://developer.apple.com/documentation/swiftui/alignment • https://developer.apple.com/documentation/swiftui/verticalalignment • https://developer.apple.com/documentation/swiftui/horizontalalignment • https://developer.apple.com/documentation/swiftui/aligning-views-within-a-stack
• alignmentguide(_:computevalue:) • https://developer.apple.com/documentation/swiftui/view/alignmentguide(_:computevalue:)-9mdoh • https://developer.apple.com/documentation/swiftui/view/alignmentguide(_:computevalue:)-6y3u2 • https://developer.apple.com/documentation/swiftui/viewdimensions Appendix
• Custom Alignment Guide • https://developer.apple.com/documentation/swiftui/aligning-views-across-stacks • https://developer.apple.com/documentation/swiftui/alignmentid • https://developer.apple.com/documentation/swiftui/verticalalignment/init(_:)
• https://developer.apple.com/documentation/swiftui/horizontalalignment/init(_:) • offset(x:y:) • https://developer.apple.com/documentation/swiftui/view/offset(x:y:) Appendix
• Grid • https://developer.apple.com/documentation/swiftui/grid • Debug • https://developer.apple.com/documentation/swiftui/inspecting-view-layout Appendix