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WWDC 2022 Split View for three column proper usage
//
// ContentView.swift
// NewNav
//
// Created by Egor Merkushev on 15.06.2022.
//
import SwiftUI
struct CustomColorCategory: Identifiable, Hashable, Equatable {
var id = UUID()
let colors: [CustomColor]
let name: String
}
struct CustomColor: Identifiable, Hashable {
var id = UUID()
let color: Color
let name: String
}
struct ContentView: View {
@Environment(\.horizontalSizeClass) var horizontalSizeClass
var colorsCategories: [CustomColorCategory] = [
CustomColorCategory(colors: [
CustomColor(color: .red, name: "red"),
CustomColor(color: .blue, name: "blue"),
CustomColor(color: .yellow, name: "yellow")
], name: "common"),
CustomColorCategory(colors: [
CustomColor(color: .cyan, name: "cyan"),
CustomColor(color: .mint, name: "mint"),
CustomColor(color: .accentColor, name: "accent")
], name: "specific"),
]
@State var selectedCategory: CustomColorCategory?
@State var selectedColor: CustomColor?
@State var pathCategory: NavigationPath = NavigationPath()
@State var pathColor: NavigationPath = NavigationPath()
var body: some View {
Group {
if horizontalSizeClass == .regular {
NavigationSplitView {
List(colorsCategories,
selection: $selectedCategory) { category in
NavigationLink(value: category) { // does not work with List selection option, presents just for visual style of selection provided by Split View sidebar
Text(category.name)
}
}
.navigationTitle("Categories")
} content: {
CategoryView(category: selectedCategory,
colorSelection: $selectedColor)
} detail: {
DetailView(color: selectedColor)
}
} else {
NavigationSplitView {
List(colorsCategories,
selection: $selectedCategory) { category in
NavigationLink(value: category) { // does not work with List selection option, presents just for visual style of selection provided by Split View sidebar
Text(category.name)
}
}
.navigationTitle("Categories")
} detail: {
NavigationStack {
CategoryView(category: selectedCategory,
colorSelection: $selectedColor)
}
}
}
}
.onChange(of: selectedCategory) { newValue in
selectedColor = nil
}
}
}
struct CategoryView: View {
var category: CustomColorCategory?
@Binding var colorSelection: CustomColor?
@Environment(\.horizontalSizeClass) var horizontalSizeClass
var body: some View {
Group {
if horizontalSizeClass == .regular {
List(category?.colors ?? [], selection: $colorSelection) { color in
row(color: color)
}
} else {
List(category?.colors ?? []) { color in
row(color: color)
}
}
}
.navigationDestination(for: CustomColor.self) { color in
DetailView(color: color)
}
.navigationTitle(category?.name ?? "")
}
@ViewBuilder
func row(color: CustomColor) -> some View {
NavigationLink(value: color) {
HStack {
Rectangle()
.fill(color.color)
.frame(width: 20, height: 20)
Text(color.name)
}
}
}
}
struct DetailView: View {
let color: CustomColor?
var body: some View {
VStack {
if let color {
Rectangle()
.fill(color.color)
.frame(width: 200, height: 200)
Text(color.name)
} else {
EmptyView()
}
}
.navigationTitle(color?.name ?? "")
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
@SoundBlaster
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Author

SoundBlaster commented Jun 16, 2022

NavigationSplitView in iOS 16 beta 1 has several visual and logic bugs inside. Apple's example is not usable on the .compact horizontal size classes. This example shows how to avoid most of caveats.

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