metatext/iOS/Views/TabNavigationView.swift

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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
import SwiftUI
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import KingfisherSwiftUI
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struct TabNavigationView: View {
@ObservedObject var viewModel: TabNavigationViewModel
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@EnvironmentObject var rootViewModel: RootViewModel
@Environment(\.displayScale) var displayScale: CGFloat
var body: some View {
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TabView(selection: $viewModel.selectedTab) {
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ForEach(TabNavigationViewModel.Tab.allCases) { tab in
NavigationView {
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view(tab: tab)
}
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.navigationViewStyle(StackNavigationViewStyle())
.tabItem {
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Label(tab.title, systemImage: tab.systemImageName)
.accessibility(label: Text(tab.title))
}
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.tag(tab)
}
}
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.sheet(isPresented: $viewModel.presentingSecondaryNavigation) {
SecondaryNavigationView(viewModel: viewModel.secondaryNavigationViewModel())
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.environmentObject(rootViewModel)
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}
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.alertItem($viewModel.alertItem)
.onAppear(perform: viewModel.refreshIdentity)
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.onReceive(NotificationCenter.default
.publisher(for: UIScene.willEnterForegroundNotification)
.map { _ in () },
perform: viewModel.refreshIdentity)
}
}
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private extension TabNavigationView {
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@ViewBuilder
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func view(tab: TabNavigationViewModel.Tab) -> some View {
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switch tab {
case .timelines:
TimelineView()
.navigationBarTitle(viewModel.identity.handle, displayMode: .inline)
.navigationBarItems(
leading: Button {
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viewModel.presentingSecondaryNavigation.toggle()
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} label: {
KFImage(viewModel.identity.image,
options: .downsampled(dimension: 28, scaleFactor: displayScale))
.placeholder { Image(systemName: "gear") }
.renderingMode(.original)
.contextMenu(ContextMenu {
ForEach(viewModel.recentIdentities) { recentIdentity in
Button {
rootViewModel.newIdentitySelected(id: recentIdentity.id)
} label: {
Label(
title: { Text(recentIdentity.handle) },
icon: {
KFImage(recentIdentity.image,
options: .downsampled(dimension: 28, scaleFactor: displayScale))
.renderingMode(.original)
})
}
}
})
})
default: Text(tab.title)
}
}
}
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#if DEBUG
struct TabNavigation_Previews: PreviewProvider {
static var previews: some View {
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TabNavigationView(viewModel: .development)
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.environmentObject(RootViewModel.development)
}
}
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#endif