๐ผ๏ธTestItemsView
SwiftUI โฉ Layout โฉ Grids โฉ examples โฉ ItemsView โฉ TestItemsView
โฌ๏ธ ้่ฆ๏ผ .dimension(), .shadowedBorder()
import SwiftUI
struct TestItemsView: View {
// โญ๏ธ source of truth
@State private var size = CGSize(300, 200)
@State private var idealRatio: CGFloat = 1
let items = Array(1...25)
// computed properties
var layout: RatioRetainingLayout {
RatioRetainingLayout(idealRatio, count: items.count, in: size)
}
var body: some View {
VStack {
ScrollView { itemsView }
display
controls
}
.padding()
}
}
extension TestItemsView {
/// cell aspect ratio
var ratio: CGFloat { size.aspectRatio / layout.cols * layout.rows }
/// a view with layed out item views
var itemsView: some View {
// ๐ ItemsView: layout item views
ItemsView(items: items) { size in
RatioRetainingLayout( // โญ inject layout instance
idealRatio, count: items.count, in: size
)
} itemView: { i in // โญ inject view builder
Color(hue: 0.8, saturation: 0.6, brightness: 0.5)
.padding(1)
.overlay { Text("\(i)").shadow(radius: 2) }
}
.frame(size) // โญ proposed size
.dimension(.topLeading, arrow: .blue, label: .orange) // ๐View+
.padding(4)
.shadowedBorder() // ๐View+ .shadowedBorder()
.padding(40)
}
/// sliders to control proposed size, ideal ratio
var controls: some View {
// ๐ SizeRatioControl
SizeRatioControl(size: $size, idealRatio: $idealRatio)
}
var display: some View {
VStack {
Text("Cells try to maintain their aspect ratio.")
.font(.title3)
Group {
Text("ideal cell aspect ratio = \(idealRatio.decimalPlaces(2))")
.foregroundColor(.secondary)
VStack {
Text("current cell aspect ratio = \(ratio.decimalPlaces(2))")
Text("rows: \(layout.rows), cols: \(layout.cols)")
}
.padding(4)
.border(.red)
}
.font(.caption)
}
}
}
// ----------------
// Previews
// ----------------
struct TestItemsView_Previews: PreviewProvider {
static var previews: some View {
TestItemsView()
.overlay {
Text("Preview")
.font(.largeTitle)
.bold()
.foregroundColor(.orange)
.opacity(0.3)
.shadow(radius: 2)
}
}
}
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