How to navigate views with enums - ios

I have followed a tutorial in SWIFT UI (only just started using it) and I am trying to open new views using the same logic applied so far. Basically there is a tab bar with 5 views (Search ,home etc...) which works opening a new view with each tabbar item, however in my homeview page I have some button cards that I want to open a new view. I can get the text for selectedSection to work but it shows the Text over the top of the homeview. How can I get it to open a new view entirely?
Here is my content view:
struct ContentView: View {
#AppStorage("selectedTab") var selectedTab: Tab = .home
#AppStorage("selectedSection") var selectedSection: Features = .calculators
#State var isOpen = false
#State var show = false
let button = RiveViewModel(fileName: "menu_button", stateMachineName: "State
Machine", autoPlay: false)
var body: some View {
ZStack {
Color("Background 2").ignoresSafeArea()
SideMenu()
.opacity(isOpen ? 1 : 0)
.offset(x: isOpen ? 0 : -300)
.rotation3DEffect(.degrees(isOpen ? 0 : 30), axis: (x: 0, y: 1, z: 0))
Group{
switch selectedTab {
case .home:
HomeView()
case .search:
Text("Search")
case .star:
Text("Favorites")
case .bell:
Text("Bell")
case .user:
Text("User")
}
switch selectedSection {
case .calculators:
Text("Calculators")
case .projects:
Text("Projects")
case .kvFinder:
Text("kv Finder")
}
}
And my home view:
var content: some View {
VStack(alignment: .leading, spacing: 0) {
Text("Welcome")
.customFont(.largeTitle)
.frame(maxWidth: .infinity, alignment: .leading)
.padding(.horizontal, 20)
ScrollView(.horizontal, showsIndicators: false) {
HStack(spacing: 20) {
ForEach(sections) { section in
Button {
selectedSection = section.features
} label : {
VCard(section: section)
}
}
}
And here is my VCard:
struct Section: Identifiable {
var id = UUID()
var title: String
var subtitle: String
var caption: String
var color: Color
var image: Image
var features: Features
}
var sections = [
Section(title: "TAB Calculations", subtitle: "Find all basic and advanced HVAC
calculations", caption: "3 sections - over 40 calculators", color: Color(hex:
"7850F0"), image: Image(systemName: "x.squareroot"), features: .calculators),
Section(title: "Upcoming Projects", subtitle: "Find upcoming and current
commissioning projects.", caption: "Over 150 projects", color: Color(hex: "6792FF"),
image: Image(systemName: "folder.fill.badge.plus"), features: .projects),
Section(title: "Valve Kv Finder", subtitle: "Quickly determine valve flow rates from
brands such as Oventropp, IMI TA and Danfoss", caption: "150 tables", color:
Color(hex: "005FE7"), image: Image(systemName: "magnifyingglass"), features:
.kvFinder)
]
enum Features: String {
case calculators
case projects
case kvFinder
}

You can use NavigationStack API if your minimum app deployment is 16+. otherwise, you may use the old NavigationView.
You can find the migration document here.
struct ContentView: View {
#State var path: [YourDestinations] = []
var body: some View {
TabView {
VStack {
NavigationStack(path: $path) { // <= here
VStack {
NavigationLink("Card 1", value: YourDestinations.place1)
NavigationLink("Card 1", value: YourDestinations.place2)
NavigationLink("Card 1", value: YourDestinations.place3)
}
.navigationDestination(for: YourDestinations.self) { destination in
switch destination {
case .place1:
Text("Detination 1")
.foregroundColor(.yellow)
case .place2:
Text("Detination 2")
.foregroundColor(.green)
case .place3:
Text("Detination 3")
.foregroundColor(.gray)
}
}
}
}
.tabItem({
Text("Tab 1")
})
Text("Hello, world!")
.padding()
.tabItem({
Text("Tab 2")
})
Text("Hello, world!")
.padding()
.tabItem({
Text("Tab 3")
})
}
}
}

Related

SwiftUI Rotation Animation off center

I am trying to make a simple dropdown list item in SwiftUI. This is what the code looks like:
struct SomeObject: Hashable {
var title: String = "title"
var entries: [String] = ["details", "details2", "details3"]
}
struct ContentView: View {
var data: [SomeObject] = [SomeObject()]
var body: some View {
List(data, id: \.self) { item in
HStack {
Text(item.title)
Spacer()
}
ForEach(item.entries, id: \.self) { entry in
ListItemView(entry)
}
}.listStyle(.plain)
}
}
struct ListItemView: View {
#State var expanded: Bool = false
#State var rotation: Double = 0
private let entry: String
init(_ entry: String) {
self.entry = entry
}
var body: some View {
VStack {
Divider().frame(maxWidth: .infinity)
.overlay(.black)
HStack {
Text(entry)
.fixedSize(horizontal: false, vertical: true)
Spacer()
Image(systemName: "chevron.down")
.foregroundColor(.black)
.padding()
.rotationEffect(.degrees(expanded ? 180 : 360))
.animation(.linear(duration: 0.3), value: expanded)
}.padding(.horizontal)
.padding(.vertical, 6)
if expanded {
Text("Details")
}
Divider().frame(maxWidth: .infinity)
.overlay(.black)
}
.listRowSeparator(.hidden)
.listRowInsets(.init())
.onTapGesture {
expanded.toggle()
}
}
}
For some reason when clicking on the list item the animation looks like this:
How can I make the arrow rotate on its center point without moving up or down at all?
The problem you have there is that the arrow is animated but when the hidden text appears, that vertical expansion is not animated. That contrast between an element animated and another that is not makes the chevron looks like it is not doing it properly. So, try to animate the VStack like this:
struct CombineView: View {
#State var expanded: Bool = false
#State var rotation: Double = 0
let entry: String = "Detalle"
var body: some View {
VStack {
Divider().frame(maxWidth: .infinity)
.overlay(.black)
HStack(alignment: .center) {
Text(entry)
.fixedSize(horizontal: false, vertical: true)
Spacer()
Image(systemName: "chevron.down")
.foregroundColor(.black)
.padding()
.rotationEffect(.degrees(expanded ? 180 : 360))
.animation(.linear(duration: 0.3), value: expanded)
}.padding(.horizontal)
.padding(.vertical, 6)
.background(.green)
if expanded {
Text("Details")
}
Divider().frame(maxWidth: .infinity)
.overlay(.black)
}.animation(.linear(duration: 0.3), value: expanded)//Animation added
.listRowSeparator(.hidden)
.listRowInsets(.init())
.onTapGesture {
expanded.toggle()
}
}
}
I hope this works for you ;)

How to add a bottom curve in TabView in SwiftUI?

I just want a Bottom curve in center of my tabView but i am not able to access tabView shape property.
This is what i want.
Note:
The curve should always remain in center. And the items should swap, which is already achieved in the given code.
import SwiftUI
struct DashboardTabBarView: View {
#State private var selection: String = "home"
struct Item {
let title: String
let color: Color
let icon: String
}
#State var items = [
Item(title: "cart", color: .red, icon: "cart"),
Item(title: "home", color: .blue, icon: "house"),
Item(title: "car", color: .green, icon: "car"),
]
var body: some View {
TabView(selection: $selection) {
ForEach(items, id: \.title) { item in // << dynamically !!
item.color
.tabItem {
Image(systemName: item.icon)
Text(item.title)
}
}
}
.onChange(of: selection) { title in // << reorder with centered item
let target = 1
if var i = items.firstIndex(where: { $0.title == title }) {
if i > target {
i += 1
}
items.move(fromOffsets: IndexSet(integer: target), toOffset: i)
}
}
}
}
Ok, actually we need to solve two problems here, first - find a height of tab bar, and second - correctly align view custom view with represented selected item over standard tab bar. Everything else is mechanics.
Here is simplified demo. Tested with Xcode 14 / iOS 16.
Main part:
a possible solution for problem #1
struct TabContent<V: View>: View {
#Binding var height: CGFloat
#ViewBuilder var content: () -> V
var body: some View {
GeometryReader { gp in // << read bottom edge !!
content()
.onAppear {
height = gp.safeAreaInsets.bottom
}
.onChange(of: gp.size) { _ in
height = gp.safeAreaInsets.bottom
}
}
}
}
a possible solution for problem #2
// Just put customisation in z-ordered over TabView
ZStack(alignment: .bottom) {
TabView(selection: $selection) {
// .. content here
}
TabSelection(height: tbHeight, item: selected)
}
struct TabSelection: View {
let height: CGFloat
let item: Item
var body: some View {
VStack {
Spacer()
Curve() // put curve over tab bar !!
.frame(maxWidth: .infinity, maxHeight: height)
.foregroundColor(item.color)
}
.ignoresSafeArea() // << push to bottom !!
.overlay(
// Draw overlay
Circle().foregroundColor(.black)
.frame(height: height).aspectRatio(contentMode: .fit)
.shadow(radius: 4)
.overlay(Image(systemName: item.icon)
.font(.title)
.foregroundColor(.white))
, alignment: .bottom)
}
}
Test module is here

Multiple vertical ScrollViews in one SwiftUI view

I am trying to implement a tab-layout LazyVGrid that will contain three different data types. For this, I have taken a Single scrollView and have created multiple LazyVGrid to accommodate this data.
The problem I am facing is, that whenever a list from tab 1 is scrolled, the list from the tab scrolls at the same offset.
There are two different solutions I have already tried -
Create LazyVGrid as a variable - I was unable to do that since the data it will have belongs to ViewModel and also LazyVGrid is a separate view in a practical example.
Use ScrollView each time - I tried doing it but every time the currently selected type changes, SwiftUI forces LazyVGrid to repopulate and shows from offset 0.
Below is what my code looks like and it'd be great if someone could help me realize how I can fix this.
Please find my code and current output. I expect that when I switch tabs and come back, the ScrollView offset remains at the position where I left it.
import SwiftUI
enum SearchType: String, CaseIterable {
case movie = "Movies"
case tv = "TV Shows"
case people = "People"
}
struct SearchContainerView: View {
#ObservedObject var viewModel = SearchViewModel()
#State var currentSelectedSearchType: SearchType = .movie
let array: [String] = ["The", "above", "works", "great", "when", "you", "know", "where", "in", "the", "array", "the", "value" ,"is", "that", "is", "when" ,"you", "know", "its", "index", "value", "As", "the", "index", "values", "begin", "at" ,"0", "the" ,"second", "entry", "will", "be", "at", "index", "1"]
var body: some View {
NavigationView {
VStack {
HStack {
ForEach(SearchType.allCases, id: \.self) { type in
HStack {
Spacer()
Text(type.rawValue)
.font(.title3)
.onTapGesture {
self.currentSelectedSearchType = type
}
Spacer()
}
.padding(5)
.background(currentSelectedSearchType == type ? Color.gray : Color.clear)
.cornerRadius(10)
}
.background(Color.gray.opacity(0.5))
.cornerRadius(10)
.padding(.horizontal)
}
ScrollView {
switch currentSelectedSearchType {
case .movie:
LazyVGrid(columns: [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
], content: {
ForEach(array, id: \.self) {
Text($0).font(.largeTitle).bold().frame(width: UIScreen.main.bounds.width / 3, height: 100, alignment: .center)
}
})
case .tv:
LazyVGrid(columns: [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
], content: {
ForEach(array, id: \.self) {
Text($0).font(.largeTitle).bold().frame(width: UIScreen.main.bounds.width / 3, height: 100, alignment: .center)
}
})
case .people:
LazyVGrid(columns: [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
], content: {
ForEach(array, id: \.self) {
Text($0).font(.largeTitle).bold().frame(width: UIScreen.main.bounds.width / 3, height: 100, alignment: .center)
}
})
}
}
}
}
}
}
Current Output -
<img src="https://i.imgur.com/TgkIXYo.mp4" alt="this slowpoke moves" width="250" />
I understand you want to switch between the different GridViews, but they should keep their individual scroll position.
To achieve that all 3 ScollViews have to stay in the view hierarchy, otherwise – as you stated – they are rebuilt and loose their position.
You can e.g. do that by putting all in a ZStack and controlling opacity (and activity) based on selection:
struct ContentView: View {
//#ObservedObject var viewModel = SearchViewModel()
#State var currentSelectedSearchType: SearchType = .movie
var body: some View {
NavigationView {
VStack {
HStack {
ForEach(SearchType.allCases, id: \.self) { type in
HStack {
Spacer()
Text(type.rawValue)
.font(.title3)
.onTapGesture {
self.currentSelectedSearchType = type
}
Spacer()
}
.padding(5)
.background(currentSelectedSearchType == type ? Color.gray : Color.gray.opacity(0.5))
.cornerRadius(10)
}
.padding(.horizontal)
}
ZStack { // here
SearchResults(type: "Movie")
.opacity(currentSelectedSearchType == .movie ? 1 : 0)
SearchResults(type: "Show")
.opacity(currentSelectedSearchType == .tv ? 1 : 0)
SearchResults(type: "Actor")
.opacity(currentSelectedSearchType == .people ? 1 : 0)
}
}
}
}
}
struct SearchResults: View {
let type: String
var body: some View {
ScrollView {
LazyVGrid(columns: [
GridItem(.flexible()),
GridItem(.flexible()),
GridItem(.flexible())
], content: {
ForEach(0..<30) {
Text("\(type) \($0)")
.font(.title).bold()
.frame(height: 100, alignment: .center)
}
})
}
}
}

SwiftUI - Segment control using buttons not deselecting other buttons properly

I am trying to make a custom segment control using a button array.
When a button is tapped, the correct value is passed to the main view and can be pressed multiple times without issue. The problem is that the previous button which was selected stays selected. The code below should work to recreate the issue. Thanks for the help.
Segment view
struct WaveTypeGridView: View {
var waveTypes = ["Beach Break" ,"Reef Break", "Point Break", "Rivermouth"]
#Binding var waveTypeSelected: String
#State var typeSelected: String
let columnSpacing: CGFloat = 5
let rowSpacing: CGFloat = 10
var gridLayout: [GridItem] {
return Array(repeating: GridItem(.flexible(), spacing: rowSpacing), count: 1)
}
var body: some View {
VStack {
Text("Wave Type \(typeSelected)")
ScrollView(.horizontal, showsIndicators: false, content: {
LazyHGrid(rows: gridLayout, alignment: .center, spacing: columnSpacing, pinnedViews: [], content: {
ForEach(waveTypes, id: \.self) { type in
if type == typeSelected {
TypeItemView(selected: true, typeSelected: self.$typeSelected, name: type)
} else {
TypeItemView(selected: false, typeSelected: self.$typeSelected, name: type)
}
}
})//: GRID
.frame(height: 18)
.padding(.vertical, 8)
.padding(.horizontal, 10)
})//: SCROLL
.background(Color(.systemGray5).cornerRadius(8))
}
}
}
struct WaveTypeGridView_Previews: PreviewProvider {
static var previews: some View {
WaveTypeGridView(waveTypeSelected: .constant(surfDataTests[0].waveType), typeSelected: "Beach Break")
.previewLayout(.sizeThatFits)
}
}
Button View
struct TypeItemView: View {
#State var selected: Bool
#Binding var typeSelected: String
let name: String
func test() {
}
var body: some View {
Button(action: {
selected.toggle()
typeSelected = name
}, label: {
HStack(alignment: .center, spacing: 6, content: {
Text(name)
.font(.footnote)
.fontWeight(.medium)
.foregroundColor(selected ? Color.white : Color.black)
})//: HSTACK
.frame(height: 18)
.padding(6)
.background(selected ? Color.blue
.cornerRadius(8)
: Color.white
.cornerRadius(8))
.background (
RoundedRectangle(cornerRadius: 8)
)
})//: BUTTON
}
}
struct TypeItemView_Previews: PreviewProvider {
static var previews: some View {
TypeItemView(selected: false, typeSelected: .constant("Rivermouth"), name:"Rivermouth")
.previewLayout(.sizeThatFits)
.padding()
.background(Color.gray)
}
}
You seem to have made your state tracking more complex than it needs to be. All you need to know is the currently selected wave type. You don't need to track a separate selected state, since the button can determine this from it's own value and the currently selected value.
For the grid view you can just have a single #State property for the selected wave type (You could inject this as an #Binding if required).
Pass the selected break type and the view's target value to the TypeItemView
struct WaveTypeGridView: View {
var waveTypes = ["Beach Break" ,"Reef Break", "Point Break", "Rivermouth"]
#State var typeSelected: String = "Beach Break"
let columnSpacing: CGFloat = 5
let rowSpacing: CGFloat = 10
var gridLayout: [GridItem] {
return Array(repeating: GridItem(.flexible(), spacing: rowSpacing), count: 1)
}
var body: some View {
VStack {
Text("Wave Type \(typeSelected)")
ScrollView(.horizontal, showsIndicators: false, content: {
LazyHGrid(rows: gridLayout, alignment: .center, spacing: columnSpacing, pinnedViews: [], content: {
ForEach(waveTypes, id: \.self) { type in
TypeItemView(typeSelected: self.$typeSelected, name: type)
}
})//: GRID
.frame(height: 18)
.padding(.vertical, 8)
.padding(.horizontal, 10)
})//: SCROLL
.background(Color(.systemGray5).cornerRadius(8))
}
}
}
Then in your TypeItemView you can create a computed property for selected based on the current value and this view's target value.
struct TypeItemView: View {
#Binding var typeSelected: String
let name: String
private var selected: Bool {
return typeSelected == name
}
func test() {
}
var body: some View {
Button(action: {
typeSelected = name
}, label: {
HStack(alignment: .center, spacing: 6, content: {
Text(name)
.font(.footnote)
.fontWeight(.medium)
.foregroundColor(self.selected ? Color.white : Color.black)
})//: HSTACK
.frame(height: 18)
.padding(6)
.background(self.selected ? Color.blue
.cornerRadius(8)
: Color.white
.cornerRadius(8))
.background (
RoundedRectangle(cornerRadius: 8)
)
})//: BUTTON
}
}
Now the whole control only depends on one #State item.

List selection not changing value

I want to change a #State var variable whenever a row in a list is being selected. Similar to what didSelectRow does in UIKit. That means when tapping on "One" the text on the right-hand side should change from "Nothing selected" to "One".
Here's my current implementation. However, tapping on a row does nothing at all.
struct ContentView: View {
#State var items = [Item(id: 1, text: "One"), Item(id: 2, text: "Two"), Item(id: 3, text: "Three")]
#State var selectedItem: Item? = nil
var body: some View {
GeometryReader { geometry in
HStack(alignment: .center) {
List(items, selection: $selectedItem) { item in
Text(item.text)
}
.frame(width: geometry.size.width / 2.5, height: geometry.size.height)
.listStyle(InsetGroupedListStyle())
Text(selectedItem?.text ?? "Nothing selected")
}
}
}
}
struct Item: Identifiable, Hashable {
var id: Int
var text: String
}
How can I change the text when someone taps a row?
Selection in List works only if EditMode is in active state, so you need to handle it manually, something like
var body: some View {
GeometryReader { geometry in
HStack(alignment: .center) {
List(items) { item in
Text(item.text)
.frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
.contentShape(Rectangle())
.onTapGesture {
selectedItem = item
}
}
.frame(width: geometry.size.width / 2.5, height: geometry.size.height)
.listStyle(InsetGroupedListStyle())
Text(selectedItem?.text ?? "Nothing selected")
}
}
}
and if needed to highlight background than also do it manually.
You can use Button inside your List, and then select the Item in their action like this
List(items, id:\.self, selection: $selectedItem) { item in
Button(action: {
self.selectedItem = item
})
{
Text(item.text)
}
}

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