I am trying to push from login view to detail view but not able to make it.even navigation bar is not showing in login view. How to push on button click in SwiftUI? How to use NavigationLink on button click?
var body: some View {
NavigationView {
VStack(alignment: .leading) {
Text("Let's get you signed in.")
.bold()
.font(.system(size: 40))
.multilineTextAlignment(.leading)
.frame(width: 300, height: 100, alignment: .topLeading)
.padding(Edge.Set.bottom, 50)
Text("Email address:")
.font(.headline)
TextField("Email", text: $email)
.frame(height:44)
.accentColor(Color.white)
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
Text("Password:")
.font(.headline)
SecureField("Password", text: $password)
.frame(height:44)
.accentColor(Color.white)
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
Button(action: {
print("login tapped")
}) {
HStack {
Spacer()
Text("Login").foregroundColor(Color.white).bold()
Spacer()
}
}
.accentColor(Color.black)
.padding()
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
.padding(Edge.Set.vertical, 20)
}
.padding(.horizontal,30)
}
.navigationBarTitle(Text("Login"))
}
To fix your issue you need to bind and manage tag with NavigationLink, So create one state inside you view as follow, just add above body.
#State var selection: Int? = nil
Then update your button code as follow to add NavigationLink
NavigationLink(destination: Text("Test"), tag: 1, selection: $selection) {
Button(action: {
print("login tapped")
self.selection = 1
}) {
HStack {
Spacer()
Text("Login").foregroundColor(Color.white).bold()
Spacer()
}
}
.accentColor(Color.black)
.padding()
.background(Color(UIColor.darkGray))
.cornerRadius(4.0)
.padding(Edge.Set.vertical, 20)
}
Meaning is, when selection and NavigationLink tag value will match then navigation will be occurs.
I hope this will help you.
iOS 16+
Note: Below is a simplified example of how to present a new view. For a more advanced generic example please see this answer.
In iOS 16 we can access the NavigationStack and NavigationPath.
Usage #1
A new view is activated by a simple NavigationLink:
struct ContentView: View {
var body: some View {
NavigationStack {
NavigationLink(value: "NewView") {
Text("Show NewView")
}
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
}
}
Usage #2
A new view is activated by a standard Button:
struct ContentView: View {
#State private var path = NavigationPath()
var body: some View {
NavigationStack(path: $path) {
Button {
path.append("NewView")
} label: {
Text("Show NewView")
}
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
}
}
Usage #3
A new view is activated programmatically:
struct ContentView: View {
#State private var path = NavigationPath()
var body: some View {
NavigationStack(path: $path) {
Text("Content View")
.navigationDestination(for: String.self) { view in
if view == "NewView" {
Text("This is NewView")
}
}
}
.onAppear {
path.append("NewView")
}
}
}
iOS 13+
The accepted answer uses NavigationLink(destination:tag:selection:) which is correct.
However, for a simple view with just one NavigationLink you can use a simpler variant: NavigationLink(destination:isActive:)
Usage #1
NavigationLink is activated by a standard Button:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
Button(action: {
self.isLinkActive = true
}) {
Text("Login")
}
}
}
.navigationBarTitle(Text("Login"))
}
}
}
Usage #2
NavigationLink is hidden and activated by a standard Button:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
Button(action: {
self.isLinkActive = true
}) {
Text("Login")
}
}
.navigationBarTitle(Text("Login"))
.background(
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
EmptyView()
}
.hidden()
)
}
}
}
Usage #3
NavigationLink is hidden and activated programmatically:
struct ContentView: View {
#State var isLinkActive = false
var body: some View {
NavigationView {
VStack(alignment: .leading) {
...
}
.navigationBarTitle(Text("Login"))
.background(
NavigationLink(destination: Text("OtherView"), isActive: $isLinkActive) {
EmptyView()
}
.hidden()
)
}
.onAppear {
self.isLinkActive = true
}
}
}
Here is a GitHub repository with different SwiftUI extensions that makes navigation easier.
Another approach:
SceneDelegate
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: BaseView().environmentObject(ViewRouter()))
self.window = window
window.makeKeyAndVisible()
}
BaseView
import SwiftUI
struct BaseView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
if viewRouter.currentPage == "view1" {
FirstView()
} else if viewRouter.currentPage == "view2" {
SecondView()
.transition(.scale)
}
}
}
}
#if DEBUG
struct MotherView_Previews : PreviewProvider {
static var previews: some View {
BaseView().environmentObject(ViewRouter())
}
}
#endif
ViewRouter
import Foundation
import Combine
import SwiftUI
class ViewRouter: ObservableObject {
let objectWillChange = PassthroughSubject<ViewRouter,Never>()
var currentPage: String = "view1" {
didSet {
withAnimation() {
objectWillChange.send(self)
}
}
}
}
FirstView
import SwiftUI
struct FirstView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
Button(action: {self.viewRouter.currentPage = "view2"}) {
NextButtonContent()
}
}
}
}
#if DEBUG
struct FirstView_Previews : PreviewProvider {
static var previews: some View {
FirstView().environmentObject(ViewRouter())
}
}
#endif
struct NextButtonContent : View {
var body: some View {
return Text("Next")
.foregroundColor(.white)
.frame(width: 200, height: 50)
.background(Color.blue)
.cornerRadius(15)
.padding(.top, 50)
}
}
SecondView
import SwiftUI
struct SecondView : View {
#EnvironmentObject var viewRouter: ViewRouter
var body: some View {
VStack {
Spacer(minLength: 50.0)
Button(action: {self.viewRouter.currentPage = "view1"}) {
BackButtonContent()
}
}
}
}
#if DEBUG
struct SecondView_Previews : PreviewProvider {
static var previews: some View {
SecondView().environmentObject(ViewRouter())
}
}
#endif
struct BackButtonContent : View {
var body: some View {
return Text("Back")
.foregroundColor(.white)
.frame(width: 200, height: 50)
.background(Color.blue)
.cornerRadius(15)
.padding(.top, 50)
}
}
Hope this helps!
Simplest and most effective solution is :
NavigationLink(destination:ScoresTableView()) {
Text("Scores")
}.navigationBarHidden(true)
.frame(width: 90, height: 45, alignment: .center)
.foregroundColor(.white)
.background(LinearGradient(gradient: Gradient(colors: [Color.red, Color.blue]), startPoint: .leading, endPoint: .trailing))
.cornerRadius(10)
.contentShape(Rectangle())
.padding(EdgeInsets(top: 16, leading: UIScreen.main.bounds.size.width - 110 , bottom: 16, trailing: 20))
ScoresTableView is the destination view.
In my opinion a cleaner way for iOS 16+ is using a state bool to present the view.
struct ButtonNavigationView: View {
#State private var isShowingSecondView : Bool = false
var body: some View {
NavigationStack {
VStack{
Button(action:{isShowingSecondView = true} ){
Text("Show second view")
}
}.navigationDestination(isPresented: $isShowingSecondView) {
Text("SecondView")
}
}
}
}
I think above answers are nice, but simpler way should be:
NavigationLink {
TargetView()
} label: {
Text("Click to go")
}
Related
I am trying to make a sidebar in swiftUI that is triggered in and out from the side with a button
I have been able to make it pop in and out from the bottom using a side modifier like this
struct sideBarExample: View {
#State var showSideBar = false
var mainView: some View{
Rectangle()
.foregroundColor(.blue)
.overlay(Text("Main View"))
}
var sideBar: some View{
Rectangle()
.foregroundColor(.green)
.overlay(Text("side bar"))
}
var body: some View {
NavigationStack{
mainView
.sheet(isPresented: $showSideBar, content: {
sideBar
})
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button {
showSideBar.toggle()
} label: {
Image(systemName: "sidebar.left")
}
}
}
}
}
}
But ideally it should be from the side
For iPhone you have to build your own sidebar, just overlay it in a ZStack and animate in with .transition.
struct ContentView: View {
#State private var showSideBar = false
var mainView: some View{
Rectangle()
.foregroundColor(.gray)
.overlay(Text("Main View"))
}
var sideBar: some View{
Rectangle()
.foregroundColor(.green)
.overlay(Text("side bar"))
.frame(width: 200)
}
var body: some View {
NavigationStack{
ZStack(alignment: .leading) {
mainView
if showSideBar {
sideBar
.transition(.move(edge: .leading))
}
}
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button {
withAnimation {
showSideBar.toggle()
}
} label: {
Image(systemName: "sidebar.left")
}
}
}
}
}
}
You can use the offset view modifier to move the sidebar around
Here is an example
struct SideBarExample: View {
#State var showSideBar = false
var mainView: some View{
Rectangle()
.foregroundColor(.blue)
.overlay(Text("Main View"))
}
var sideBar: some View{
HStack{
Rectangle()
.foregroundColor(.green)
.overlay(Text("side bar"))
.frame(width:250)
Spacer()
}
}
var body: some View {
NavigationStack{
ZStack{
mainView
sideBar
.offset(CGSize(width: showSideBar ? 0:-250, height: 0))
}
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button {
withAnimation {
showSideBar.toggle()
}
} label: {
Image(systemName: "sidebar.left")
}
}
}
}
}
}
Here is what that looks like
I'm learning SwiftUI over break for fun over youtube, trying to build a fun little app to learn stuff and i'm attempting to make a custom tab bar at the bottom to control views, and have objects (i made a Person object) that i owuld like to be able to access and modify throughout all my views. From what I can tell, I've achieved that, as it runs perfectly well as I expect it to on the Simulator, but when I try to run on my iPhone I get the error "Thread 1: EXC_BAD_ACCESS (code=257, address=0x481bdfee88082008)"
I'm not familiar with reading memory addresses, i'm just trying to screw around with building apps for fun with my downtime
myTestApp.swift
import SwiftUI
#main
struct myTestApp: App {
var testPerson = Person(name: "Stinky", age: 69)
var body: some Scene {
WindowGroup {
ContentView()
.environmentObject(testPerson)
}
}
}
ContentView.swift
import SwiftUI
struct ContentView: View {
#State var selectedIndex = 0
let icons = [
"house", "person", "doc", "dice", "gear"
]
let tabNames = [
"Home", "People", "Overview", "Activities", "Settings"
]
var body: some View {
VStack {
ZStack {
switch selectedIndex {
case 0: HomeView()
case 1: PeopleView()
case 2: OverView()
case 3: ActivitiesView()
case 4: SettingsView()
default: HomeView()
}
}
Divider()
.frame(height: 2.0)
HStack {
ForEach(0..<5, id: \.self) { i in
Spacer()
VStack {
Image(systemName: icons[i])
.frame(height: 20.0)
.font(.system(size:23))
.foregroundColor(self.selectedIndex == i ? Color("SelectedColor") : Color("AccentColor"))
Text("\(tabNames[i])")
.font(.system(size:10, weight: .medium, design: .default))
.foregroundColor(self.selectedIndex == i ? Color("SelectedColor") : Color("AccentColor"))
.padding(.top, 1.0)
}
.onTapGesture {
selectedIndex = i
}
.frame(width: 70.0, height: 60.0)
Spacer()
}
}
.frame(height: 41.0)
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Views.swift
import SwiftUI
struct HomeView: View {
#EnvironmentObject var testPerson: Person
var body: some View {
NavigationView {
VStack {
ScrollView {
VStack {
Text(testPerson.name + " \(testPerson.age)")
ForEach(0..<5) { i in
Text("The Train Has Arrived!")
.padding(.all, 3.0)
}
}
.frame(maxWidth: .infinity, maxHeight: .infinity)
.cornerRadius(20)
.background(Color.gray)
}
Button(action: {
testPerson.age += 1
}, label: {
Text("Age: \(testPerson.age)")
.font(.system(size: 20))
.foregroundColor(.white)
.frame(maxWidth: .infinity)
})
.frame(maxWidth: .infinity, maxHeight: 50)
.foregroundColor(.blue)
.background(.blue)
.cornerRadius(15)
.padding(.horizontal)
}
.navigationTitle("Age: \(testPerson.age)")
}
}
}
struct PeopleView: View {
#EnvironmentObject var testPerson: Person
#State var newPersonCreation = false
var body: some View {
NavigationView {
VStack {
ZStack {
Spacer().fullScreenCover(isPresented: $newPersonCreation, content: {
Button("ass", action: {
self.newPersonCreation.toggle()
})
})
}
Text("Age: \(testPerson.age)")
}
.navigationTitle("People")
.toolbar {
Button(action: {
self.newPersonCreation.toggle()
}, label: {
Image(systemName: "plus")
.foregroundColor(.white)
})
}
}
}
}
struct OverView: View {
var body: some View {
NavigationView {
VStack {
}
.navigationTitle("Overview")
}
}
}
struct ActivitiesView : View {
var body: some View {
NavigationView {
VStack {
}
.navigationTitle("Activities")
}
}
}
struct SettingsView: View {
var body: some View {
NavigationView {
VStack {
}
.navigationTitle("Settings")
}
}
}
struct Previews_Views_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Person.swift
import SwiftUI
class Person: ObservableObject {
#Published var name = "Anonymous"
#Published var age = 1
init(name: String, age: Int) {
self.name = name
self.age = age
}
}
I am working on an app where the Welcome Screen should be dismissed with a button but I can't figure out how to toggle the welcome screen. I tried to use #Binding and #AppStorage but no success within the existing UserDefaults.
Like an onboarding, the launch screen should only show screen once when the app is first opened.
Thanks for the help!
extension UserDefaults {
var welcomeScreenShown: Bool {
get {
return (UserDefaults.standard.value(forKey: "welcomeScreenShown") as? Bool) ?? false
}
set {
UserDefaults.standard.setValue(newValue, forKey: "welcomeScreenShown")
}
}
}
struct ContentView: View {
var body: some View {
if UserDefaults.standard.welcomeScreenShown {
HomeView()
} else {
WelcomeScreen()
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
struct WelcomeScreen: View {
#AppStorage("welcomeScreenShown")
var welcomeScreenShown: Bool = false
var body: some View {
VStack(alignment: .leading) {
Text("Welcome to")
.font(.system(size: 50, weight: .bold))
.foregroundColor(.black)
.offset(y: -7)
Text("App")
.font(.system(size: 50, weight: .heavy))
.foregroundColor(.black)
.offset(y: -14)
Button(action: {}, label: {
Text("Get Started")
})
.font(.system(size: 18, weight: .bold))
.foregroundColor(.white)
.padding(.horizontal, 25)
.padding(.vertical, 10)
.background(Color.blue)
.clipShape(Capsule())
.animation(.easeInOut(duration: 0.25))
}.frame(maxWidth: .infinity, maxHeight: .infinity).background(Color.white)
.onAppear(perform: { UserDefaults.standard.welcomeScreenShown = true
})
}
}
struct WelcomeScreen_Previews: PreviewProvider {
static var previews: some View {
WelcomeScreen()
}
You can use #AppStorage at the top level and then pass it with a #Binding to the WelcomeScreen:
struct ContentView: View {
#AppStorage("welcomeScreenShown")
var welcomeScreenShown: Bool = false
var body: some View {
if welcomeScreenShown {
HomeView()
} else {
WelcomeScreen(welcomeScreenShown: $welcomeScreenShown)
}
}
}
struct HomeView : View {
var body: some View {
Text("Home")
}
}
struct WelcomeScreen: View {
#Binding var welcomeScreenShown : Bool
var body: some View {
Text("Welcome")
Button(action: {
welcomeScreenShown = true
}) {
Text("Done")
}
}
}
struct WelcomeScreen_Previews: PreviewProvider {
static var previews: some View {
WelcomeScreen(welcomeScreenShown: .constant(false))
}
}
Another option is to use #AppStorage on both screens, but it seems redundant.
With #AppStroage, there doesn't seem to be a need for your first extension.
I have been following a tutorial on creating a weather app. I am trying to take it further. When on the weather view the user can click a plus button which takes them to a location view. Here the user will be able to update the location then when going back the weather will reload. But i am really struggling to get the weather to reload when pressing the back button.
Below is my code for the WeatherView & LocationView
Thank you
struct WeatherView: View {
#State private var isShowing = false
#State var width = UIScreen.main.bounds.width - 60
#State var x = -UIScreen.main.bounds.width + 60
#ObservedObject var input = CityId()
let heptics = UIImpactFeedbackGenerator(style: .medium)
#ObservedObject var weatherViewModel = WeatherViewModel()
var body: some View {
NavigationView{
ZStack {
BackgroundView()
VStack {
if weatherViewModel.stateView == .loading {
ActivityIndicatorView(isAnimating: true).configure {
$0.color = .white
}
}
if weatherViewModel.stateView == .success {
LocationAndTemperatureHeaderView(data: weatherViewModel.currentWeather)
Spacer()
ScrollView(.vertical, showsIndicators: false) {
VStack {
DailyWeatherCellView(data: weatherViewModel.todayWeather)
Rectangle().frame(height: CGFloat(1))
HourlyWeatherView(data: weatherViewModel.hourlyWeathers)
Rectangle().frame(height: CGFloat(1))
DailyWeatherView(data: weatherViewModel.dailyWeathers)
Rectangle().frame(height: CGFloat(1))
Text(weatherViewModel.currentDescription)
.frame(maxWidth: .infinity, alignment: .leading)
.padding(
.init(arrayLiteral:.leading,.trailing),
24
)
Rectangle().frame(height: CGFloat(1))
DetailsCurrentWeatherView(data: weatherViewModel.currentWeather)
Rectangle().frame(height: CGFloat(1))
}
}
Spacer()
}
if weatherViewModel.stateView == .failed {
Button(action: {
self.weatherViewModel.retry()
}) {
Text("Failed get data, retry?")
.foregroundColor(.white)
}
}
}
}.colorScheme(.dark)
.listStyle(InsetGroupedListStyle())
.background(
NavigationLink(destination: LocationView(input: input, weatherViewModel: weatherViewModel), isActive: $isShowing) {
EmptyView()
}
) // End of Background
.navigationBarTitle((input.score), displayMode: .inline)
.toolbar {
ToolbarItem(placement: .navigationBarTrailing){
Button(action: {
isShowing = true
heptics.impactOccurred()
}) {
Image(systemName: "plus")
}
} // End of ToolbarItem
} // End of Toolbar
} // End of Nav View
} // End of body
} // End of View
struct LocationView: View {
#ObservedObject var input: CityId
#ObservedObject var weatherViewModel: WeatherViewModel
#Environment(\.presentationMode) var presentationMode: Binding<PresentationMode>
var body: some View {
Button(action: {
input.score = "2643743"
weatherViewModel.stateView = .loading
self.presentationMode.wrappedValue.dismiss()
}) {
Image(systemName: "plus")
}
.navigationBarBackButtonHidden(true)
}
}
You may consider adding .onAppear modifier to your first view then you can update the data.
Swift 5.x iOS 13/14
Trying to build a custom action sheet and mystified as to why this slides from the left and then up when I am telling it to simply slide from the bottom or at least I thought that was what I was asking.
import SwiftUI
struct ContentView: View {
#State private var showingCustomSheet = false
var body: some View {
ZStack {
Button(action: {
self.showingCustomSheet.toggle()
}) {
Text("Fire")
.font(.largeTitle)
.foregroundColor(Color.red)
}
if showingCustomSheet {
CustomAlertSheet(showingCustomSheet: $showingCustomSheet)
}
}
}
}
struct CustomAlertSheet: View {
#Binding var showingCustomSheet: Bool
#State var showEscape = false
var body: some View {
VStack {
Spacer().onAppear {
withAnimation(.linear(duration: 2)) {
showEscape.toggle()
}
}
if showEscape {
Rectangle()
.fill(Color.red)
.frame(width: 256, height: 128)
.transition(.move(edge: .bottom))
.animation(.default)
}
}
}
}
Here is a solution - removed redundant things and some small fixes... Tested with Xcode 12 / iOS 14.
struct ContentView: View {
#State private var showingCustomSheet = false
var body: some View {
ZStack {
Button(action: {
self.showingCustomSheet.toggle()
}) {
Text("Fire")
.font(.largeTitle)
.foregroundColor(Color.red)
}
CustomAlertSheet(showingCustomSheet: $showingCustomSheet)
}
}
}
struct CustomAlertSheet: View {
#Binding var showingCustomSheet: Bool
var body: some View {
VStack {
Spacer()
if showingCustomSheet {
Rectangle()
.fill(Color.red)
.frame(width: 256, height: 128)
.transition(.move(edge: .bottom))
}
}
.animation(.default, value: showingCustomSheet)
}
}