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Simple flow layout in SwiftUI
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import SwiftUI | |
/// A view that arranges its children in horizontal lines | |
/// | |
/// FlowStack { | |
/// ForEach(1..<100) { num in | |
/// Text(String(num)) | |
/// .padding(8) | |
/// .background(Circle().fill(Color.red)) | |
/// } | |
/// } | |
/// | |
public struct FlowStack<Content: View>: View { | |
let content: () -> Content | |
let spacing: CGSize | |
/// Creates an instance with the given spacing and content. | |
/// | |
/// - Parameter spacing: A `CGSize` value indicating the space between children. | |
/// - Parameter content: A view builder that creates the content of this stack. | |
public init(spacing: CGSize = .zero, @ViewBuilder content: @escaping () -> Content) { | |
self.content = content | |
self.spacing = spacing | |
} | |
public var body: some View { | |
ZStack(alignment: .topLeading) { | |
// Setup for layout pass | |
var available: CGFloat = 0 | |
var x: CGFloat = 0 | |
var y: CGFloat = 0 | |
Color.clear | |
.frame(height: 0) | |
.alignmentGuide(.top) { item in | |
available = item.width | |
x = 0 | |
y = 0 | |
return 0 | |
} | |
content() | |
.alignmentGuide(.leading) { item in | |
if x + item.width > available { | |
x = 0 | |
y += item.height + spacing.height | |
} | |
let result = x | |
x += item.width + spacing.width | |
return -result | |
} | |
.alignmentGuide(.top) { _ in | |
-y | |
} | |
} | |
} | |
} | |
struct FlowStack_Previews: PreviewProvider { | |
static var previews: some View { | |
FlowStack { | |
ForEach(1..<100) { num in | |
Text(String(num)) | |
.frame(minWidth: 30, minHeight: 30) | |
.background(Circle().fill(Color.red)) | |
} | |
} | |
} | |
} |
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