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Flow Layout 을 편리하게 사용하기위해 https://swiftuirecipes.com/blog/flow-layout-in-swiftui 의 코드를 가져와보았습니다.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| // | ||
| // TagButtonViewModel.swift | ||
| // HunnitLog | ||
| // | ||
| // Created by seungwook.jung on 2020/12/15. | ||
| // | ||
|
|
||
| import Foundation | ||
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|
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| struct TagButtonViewModel: Identifiable, Hashable { | ||
| let id: UUID = UUID() | ||
| let title: String | ||
| var isSelected: Bool = false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // | ||
| // FlowView.swift | ||
| // HunnitLog | ||
| // | ||
| // https://swiftuirecipes.com/blog/flow-layout-in-swiftui | ||
| // | ||
|
|
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| import SwiftUI | ||
|
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| struct FlowView<B, T: Hashable, V: View>: View { | ||
| let mode: Mode | ||
| @Binding var binding: B | ||
| let items: [T] | ||
| let viewMapping: (T) -> V | ||
|
|
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| @State private var totalHeight: CGFloat | ||
|
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| init(mode: Mode, binding: Binding<B>, items: [T], viewMapping: @escaping (T) -> V) { | ||
| self.mode = mode | ||
| _binding = binding | ||
| self.items = items | ||
| self.viewMapping = viewMapping | ||
| _totalHeight = State(initialValue: (mode == .scrollable) ? .zero : .infinity) | ||
| } | ||
|
|
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| var body: some View { | ||
| let stack = VStack { | ||
| GeometryReader { geometry in | ||
| self.content(in: geometry) | ||
| } | ||
| } | ||
| return Group { | ||
| if self.mode == .scrollable { | ||
| stack.frame(height: self.totalHeight) | ||
| } else { | ||
| stack.frame(maxHeight: self.totalHeight) | ||
| } | ||
| } | ||
| } | ||
|
|
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| private func content(in g: GeometryProxy) -> some View { | ||
| var width = CGFloat.zero | ||
| var height = CGFloat.zero | ||
| return ZStack(alignment: .topLeading) { | ||
| ForEach(self.items, id: \.self) { item in | ||
| self.viewMapping(item) | ||
| .padding([.horizontal, .vertical], 4) | ||
| .alignmentGuide(.leading, computeValue: { d in | ||
| if (abs(width - d.width) > g.size.width) { | ||
| width = 0 | ||
| height -= d.height | ||
| } | ||
| let result = width | ||
| if item == self.items.last { | ||
| width = 0 | ||
| } else { | ||
| width -= d.width | ||
| } | ||
| return result | ||
| }) | ||
| .alignmentGuide(.top, computeValue: { d in | ||
| let result = height | ||
| if item == self.items.last { | ||
| height = 0 | ||
| } | ||
| return result | ||
| }) | ||
| } | ||
| } | ||
| .background(viewHeightReader($totalHeight)) | ||
| } | ||
|
|
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| private func viewHeightReader(_ binding: Binding<CGFloat>) -> some View { | ||
| return GeometryReader { geo -> Color in | ||
| DispatchQueue.main.async { | ||
| binding.wrappedValue = geo.frame(in: .local).size.height | ||
| } | ||
| return .clear | ||
| } | ||
| } | ||
|
|
||
| enum Mode { | ||
| case scrollable, vstack | ||
| } | ||
| } |
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