I have the following code that currently gives me the following errors:
The code is:
import SwiftUI
struct EmailList: Identifiable {
var img: Image
var id: String
var isOn = false
}
struct ContentView: View {
#State var lists = [
EmailList(img: Image(systemName: "car.fill"), id: "Monthly Updates", isOn: true),
EmailList(img: Image(systemName: "car.fill"), id: "News Flashes", isOn: false),
EmailList(img: Image(systemName: "car.fill"), id: "Special Offers", isOn: true)
]
var body: some View {
Form {
Section {
ForEach($lists) { $list in
Toggle(list.img, list.id, isOn: $list.isOn)
}
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Which produces something like this on the watch:
I'm not exactly sure what it is saying/wanting me to do. Most of the examples I've seen have been in this type of format so I'm not sure if that's because it was an app just for the iPhone or something else.
All of the variables are filled out along with its class to define an image as the first parameter's, then the name (id) and last the true or false.
My goal in all of this is to have it look like this:
You can achieve this using a Label for your Toggle's label, e.g.
struct ContentView: View {
#State var lists = [
EmailList(img: Image(systemName: "car.fill"), id: "Monthly Updates", isOn: true),
EmailList(img: Image(systemName: "car.fill"), id: "News Flashes", isOn: false),
EmailList(img: Image(systemName: "car.fill"), id: "Special Offers", isOn: true)
]
var body: some View {
Form {
Section {
ForEach($lists) { $list in
Toggle(isOn: $list.isOn) {
Label {
Text(list.id)
} icon: {
list.img
}
}
}
}
}
}
}
Related
I am trying to piece together a custom NavigationView in SwiftUI with Buttons for filtering. In this simple step I am just trying to change '.navigationTitle(title)' through filtering with three buttons ('header1', 'header2', 'header3'), however it is not working.
You can find a visual of this code here
ContentView:
struct ContentView: View {
var body: some View {
MainView(filter: .header1)
}
}
MainView:
struct MainView: View {
enum SourceType {
case header1, header2, header3
}
#EnvironmentObject var sourceItems: SourceItems
let filter: SourceType
var body: some View {
NavigationView {
List {
HeaderView()
ForEach(0..<10) { sourceItem in
NavigationLink(destination: Text("Destination")) {
Text("Item: \(sourceItem)")
}
}
}
.listStyle(.inset)
.navigationTitle(title) // I am trying to make this change
}
}
var title: String {
switch filter {
case .header1:
return "Header 1"
case .header2:
return "Header 2"
case .header3:
return "Header 3"
}
}
}
struct MainView_Previews: PreviewProvider {
static var previews: some View {
MainView(filter: .header1)
.environmentObject(SourceItems())
}
}
HeaderView (This is where I get the warnings):
struct HeaderView: View {
#StateObject var sourceItems = SourceItems()
var body: some View {
HStack {
Button(action: {
MainView(filter: .header1)
}, label: {
Text("Header 1")
})
.buttonStyle(PlainButtonStyle())
Spacer()
Button(action: {
MainView(filter: .header2)
}, label: {
Text("Header 2")
})
.buttonStyle(PlainButtonStyle())
Spacer()
Button(action: {
MainView(filter: .header3)
}, label: {
Text("Header 3")
})
.buttonStyle(PlainButtonStyle())
}
.environmentObject(sourceItems)
}
}
The code runs but the buttons don't filter.
Thanks for any help (I am new to SwiftUI)!
When the app first launches in macOS (Big Sur), it populates a list with the items saved by the user. When the user clicks on an item on that list, a second view opens up displaying the contents of that item.
Is there a way to select the first item on that list, as if the user clicked it, and display the second view when the app launches? Furthermore, if I delete an item on the list, I can't go back and select the first item on the list and displaying the second view for that item, or if I create new item, same applies, can't select it.
I have tried looking at answers here, like this, and this, and looked and tried code from a variety of places, but I can't get this to work.
So, using the code answered on my previous question, here's how the bare bones app looks like:
struct NoteItem: Codable, Hashable, Identifiable {
let id: Int
var text: String
var date = Date()
var dateText: String {
dateFormatter.dateFormat = "EEEE, MMM d yyyy, h:mm a"
return dateFormatter.string(from: date)
}
var tags: [String] = []
}
final class DataModel: ObservableObject {
#AppStorage("notes") public var notes: [NoteItem] = []
}
struct AllNotes: View {
#EnvironmentObject private var data: DataModel
#State var noteText: String = ""
var body: some View {
NavigationView {
List(data.notes) { note in
NavigationLink(destination: NoteView(note: note)) {
VStack(alignment: .leading) {
Text(note.text.components(separatedBy: NSCharacterSet.newlines).first!)
Text(note.dateText).font(.body).fontWeight(.light)
}
.padding(.vertical, 8)
}
}
.listStyle(InsetListStyle())
Text("Select a note...")
.frame(maxWidth: .infinity, maxHeight: .infinity)
}
.navigationTitle("A title")
.toolbar {
ToolbarItem(placement: .navigation) {
Button(action: {
data.notes.append(NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []))
}) {
Image(systemName: "square.and.pencil")
}
}
}
}
}
struct NoteView: View {
#EnvironmentObject private var data: DataModel
var note: NoteItem
#State var text: String = ""
var body: some View {
HStack {
VStack(alignment: .leading) {
TextEditor(text: $text).padding().font(.body)
.onChange(of: text, perform: { value in
guard let index = data.notes.firstIndex(of: note) else { return }
data.notes[index].text = value
})
Spacer()
}
Spacer()
}
.padding()
.frame(maxWidth: .infinity, maxHeight: .infinity)
.background(Color.white)
.onAppear() {
print(data.notes.count)
}
}
}
I have tried adding #State var selection: Int? in AllNotes and then changing the list to
List(data.notes, selection: $selection)
and trying with that, but I can't get it to select anything.
Sorry, newbie here on SwiftUI and trying to learn.
Thank you!
You were close. Table view with selection is more about selecting item inside table view, but you need to select NavigationLink to be opened
There's an other initializer to which does exactly what you need. To selection you pass current selected item. To tag you pass current list item, if it's the same as selection, NavigationLink will open
Also you need to store selectedNoteId instead of selectedNote, because this value wouldn't change after your update note properties
Here I'm setting selectedNoteId to first item in onAppear. You had to use DispatchQueue.main.async hack here, probably a NavigationLink bug
To track items when they get removed you can use onChange modifier, this will be called each time passed value is not the same as in previous render
struct AllNotes: View {
#EnvironmentObject private var data: DataModel
#State var noteText: String = ""
#State var selectedNoteId: UUID?
var body: some View {
NavigationView {
List(data.notes) { note in
NavigationLink(
destination: NoteView(note: note),
tag: note.id,
selection: $selectedNoteId
) {
VStack(alignment: .leading) {
Text(note.text.components(separatedBy: NSCharacterSet.newlines).first!)
Text(note.dateText).font(.body).fontWeight(.light)
}
.padding(.vertical, 8)
}
}
.listStyle(InsetListStyle())
}
.navigationTitle("A title")
.toolbar {
ToolbarItem(placement: .navigation) {
Button(action: {
data.notes.append(NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []))
}) {
Image(systemName: "square.and.pencil")
}
}
}
.onAppear {
DispatchQueue.main.async {
selectedNoteId = data.notes.first?.id
}
}
.onChange(of: data.notes) { notes in
if selectedNoteId == nil || !notes.contains(where: { $0.id == selectedNoteId }) {
selectedNoteId = data.notes.first?.id
}
}
}
}
Not sure what's with #AppStorage("notes"), it shouldn't work because this annotation only applied to simple types. If you wanna store your items in user defaults you had to do it by hand.
After removing it, you were missing #Published, that's why it wasn't updating in my case. If AppStorage could work, it may work without #Published
final class DataModel: ObservableObject {
#Published
public var notes: [NoteItem] = [
NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []),
NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []),
NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []),
NoteItem(id: UUID(), text: "New Note", date: Date(), tags: []),
]
}
How do I create another view when the user chooses a device ? For each device, the view will not be the same because the information given will not be the same ( custom view )
Thank you to put me on the track.
Canvas image
struct ContentView: View {
var body: some View {
NavigationView {
List(Ios, children: \.sousMenuIos) { item in
HStack {
Image(item.image)
.resizable()
.scaledToFit()
.frame(width: 60, height: 60)
Text(item.name)
.font(.system(.title3, design: .rounded))
.bold()
}
}
.navigationTitle("Jailbreak")
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
You need to wrap your list label in a NavigationLink and pass the item to the costum view that you want. here is a working example with dummy data.
struct ListItems: View {
var body: some View {
NavigationView {
List(iOS.previewData) { item in
NavigationLink(destination: CostumView(text: item.name)){
HStack {
Image(systemName: item.image)
.resizable()
.scaledToFit()
.frame(width: 60, height: 60)
Text(item.name)
.font(.system(.title3, design: .rounded))
.bold()
}
}
}
.navigationTitle("Jailbreak")
}
}
}
struct CostumView: View {
var text: String
var body: some View{
Text(text)
}
}
struct ListItems_Previews: PreviewProvider {
static var previews: some View {
ListItems()
}
}
struct iOS: Identifiable {
var id = UUID()
var image: String = ""
var name: String
static let previewData = [
iOS(image: "phone", name: "iPhone 8"),
iOS(image: "phone", name: "iPhone X")
]
}
I have a view that makes an API call to pull nearby restaurant data and display it in a list. I've placed a button in the navigation bar of that view to display a sheet which will ultimately show the user filter options. For now, it uses a Picker placed in a form to allow the user to pick how they want to sort the results. I am using a variable with a #Binding property wrapper in the filter view to pass the selected value to a #State variable in the restaurant data view (selectedOption). It all works great until the view is reloaded. Either by going to a different view or relaunching the app. It appears the selectedOption variable in my API call in the onAppear function of the restaurant data view is being reset to what I've set the default value to when I defined the #State variable. I am wondering if there is a way to persist the value of what was chosen in the filter view through view reloads of the restaurant data view.
Restaurant data view:
import SwiftUI
import SwiftyJSON
import SDWebImageSwiftUI
struct RestaurantsView: View {
#EnvironmentObject var locationViewModel: LocationViewModel
#EnvironmentObject var venueDataViewModel: VenueDataViewModel
#State var selectedOption: String = "rating"
#State private var showingSheet = false
#State private var searchText = ""
#State private var showCancelButton: Bool = false
var body: some View {
let CPLatitude: Double = locationViewModel.lastSeenLocation?.coordinate.latitude ?? 0.00
let CPLongitude: Double = locationViewModel.lastSeenLocation?.coordinate.longitude ?? 0.00
GeometryReader { geometry in
VStack {
Text("Restaurants")
.padding()
List(venueDataViewModel.venuesListTen) { index in
NavigationLink(destination: RestaurantsDetailView(venue: index)) {
HStack {
VStack(alignment: .leading, spacing: 6) {
Text(index.name ?? "")
.font(.body)
.lineLimit(2)
Text(index.address ?? "")
.font(.subheadline)
.lineLimit(2)
}
}
}
Spacer()
if index.image != nil {
WebImage(url: URL(string: index.image ?? ""), options: .highPriority, context: nil)
.resizable()
.frame(width: 70, height: 70, alignment: .center)
.aspectRatio(contentMode: .fill)
.cornerRadius(12)
}
}
Text("Selected: \(selectedOption)")
Spacer()
}.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button(action: {
showingSheet.toggle()
}, label: {
Image(systemName: "line.horizontal.3")
.imageScale(.large)
}
)
.sheet(isPresented: $showingSheet, content: {
NavigationView {
RestaurantsFilterView(selectedOption: self.$selectedOption)
}
})
}
}
.onAppear {
venueDataViewModel.retrieveVenues(latitude: CPLatitude, longitude: CPLongitude, category: "restaurants", limit: 50, sortBy: selectedOption, locale: "en_US") { (response, error) in
if let error = error {
print("\(error)")
}
}
}
}
}
}
Filter view:
import SwiftUI
struct RestaurantsFilterView: View {
#EnvironmentObject var locationViewModel: LocationViewModel
#EnvironmentObject var venueDataViewModel: VenueDataViewModel
var sortOptions = ["rating", "review_count"]
#Binding var selectedOption: String
var body: some View {
let CPLatitude: Double = locationViewModel.lastSeenLocation?.coordinate.latitude ?? 0.00
let CPLongitude: Double = locationViewModel.lastSeenLocation?.coordinate.longitude ?? 0.00
VStack {
Text("Filter")
Form {
Section {
Picker(selection: $selectedOption, label: Text("Sort")) {
ForEach(sortOptions, id: \.self) {
Text($0)
}
}.onChange(of: selectedOption) { Equatable in
venueDataViewModel.retrieveVenues(latitude: CPLatitude, longitude: CPLongitude, category: "restaurants", limit: 50, sortBy: selectedOption, locale: "en_US") { (response, error) in
if let error = error {
print("\(error)")
}
}
}
}
}
}
}
}
I am still new to Swift and SwiftUI so I appreciate the help.
Thank you!
After creating the code, i would like to create a summary view that allows me to view the values that have been chosen in the picker.
How can I do? I read some forums about #ObservableObject and about #EnvironmentObject, but I can't understand ...
Thanks very much :)
import SwiftUI
//SUMMARYPAGE
struct SummaryView: View {
var body: some View {
NavigationView {
Form {
VStack(alignment: .leading, spacing: 6) {
Text("First Animal: \("firstAnimalSelected")")
Text("First Animal: \("secondAnimalSelected")")
}
}
}
}
}
struct SummaryView_Previews: PreviewProvider {
static var previews: some View {
SummaryView()
}
}
enum Animal: String, CaseIterable {
case select
case bear
case cat
case dog
case lion
case tiger
}
struct ContentView: View {
#State private var firstAnimal = Animal.allCases[0]
#State private var secondAnimal = Animal.allCases[0]
var body: some View {
NavigationView {
Form {
Section(header: Text("Animals")
.foregroundColor(.black)
.font(.system(size: 15))
.fontWeight(.bold)) {
Picker(selection: $firstAnimal, label: Text("Select first animal")) {
ForEach(Animal.allCases, id: \.self) { element in
Text(element.rawValue.capitalized)
}
}
Picker(selection: $secondAnimal, label: Text("Select second animal")) {
ForEach(Animal.allCases.filter { $0 != firstAnimal || firstAnimal == .select }, id: \.self) { element2 in
Text(element2.rawValue.capitalized)
}
}
}.font(.system(size: 15))
}.navigationBarTitle("List", displayMode: .inline)
}
}
}
You can move your #State properties to an ObservableObject:
class ViewModel: ObservableObject {
#Published var firstAnimal = Animal.allCases[0]
#Published var secondAnimal = Animal.allCases[0]
}
and access them from an #EnvironmentObject:
struct ContentView: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
...
Picker(selection: $viewModel.firstAnimal, label: Text("Select first animal")) {
ForEach(Animal.allCases, id: \.self) { element in
Text(element.rawValue.capitalized)
}
}
}
}
struct SummaryView: View {
#EnvironmentObject var viewModel: ViewModel
var body: some View {
NavigationView {
Form {
VStack(alignment: .leading, spacing: 6) {
Text("First Animal: \(viewModel.firstAnimal.rawValue)")
Text("Second Animal: \(viewModel.secondAnimal.rawValue)")
}
}
}
}
}
Remember to inject your ViewModel to your root view:
ContentView().environmentObject(ViewModel())