Refreshable Indicator is presented on view's appear - ios
Once a view appears refreshable indicator is already visible without the necessity of performing the swipe on list. When I swipe the list up it hides and then pull to refresh can be performed in correct way (it shows, performs actions and hide).
My View:
struct OrdersView: View {
#EnvironmentObject private var tabBarStateManager: TabBarStateManager
#EnvironmentObject private var profileViewModel: ProfileViewModel
#StateObject private var ordersViewModel: OrdersViewModel = OrdersViewModel()
#Environment(\.dismiss) private var dismiss: DismissAction
var body: some View {
List {
ForEach(ordersViewModel.datesForOrdersViewListSections, id: \.self) { stringDate in
Section {
ForEach(ordersViewModel.getOrdersFor(date: stringDate), id: \.self) { order in
NavigationLink(destination: OrderDetailsView(order: order,
orderProductsList: ordersViewModel.getOrderProductsFor(order: order))
.environmentObject(ordersViewModel)) {
VStack(alignment: .leading, spacing: 20) {
HStack(spacing: 10) {
Text(order.id)
.font(.ssCallout)
Spacer()
Text(Date.getDayAndMonthFrom(date: order.orderDate))
.font(.ssTitle3)
.foregroundColor(.accentColor)
}
Text("$\(order.totalCost, specifier: "%.2f")")
.font(.ssTitle3)
.foregroundColor(.accentColor)
VStack(alignment: .leading) {
HStack {
Text(TexterifyManager.localisedString(key: .ordersView(.products)))
.font(.ssCallout)
Text("\(ordersViewModel.getOrderProductsFor(order: order).count)")
.font(.ssTitle3)
.foregroundColor(.accentColor)
}
HStack {
Text(TexterifyManager.localisedString(key: .ordersView(.orderStatus)))
.font(.ssCallout)
Text(order.status.rawValue)
.font(.ssTitle3)
.foregroundColor(.accentColor)
}
}
}
.padding(.vertical)
}
}
} header: {
Text(stringDate)
.font(.ssTitle1)
.foregroundColor(.accentColor)
}
}
}
.listStyle(.grouped)
.refreshable {
profileViewModel.fetchUserOrders {
ordersViewModel.userOrders = profileViewModel.userOrders
}
}
.navigationTitle(TexterifyManager.localisedString(key: .ordersView(.navigationTitle)))
.navigationBarTitleDisplayMode(.inline)
.navigationBarBackButtonHidden(true)
.toolbar {
ToolbarItem(placement: .navigationBarLeading) {
Button {
dismiss()
} label: {
Image(systemName: "arrow.backward.circle.fill")
.resizable()
.frame(width: 30, height: 30)
.foregroundColor(.accentColor)
}
}
}
.onAppear {
ordersViewModel.userOrders = profileViewModel.userOrders
}
}
}
Changing .refreshable modifier order does not fix the problem
Changing .listStyle also does not help
The problem only occurs on physical device on iPhone 13 Pro Max (iOS 16.1). The same version of simulator does not have the problem.
EDIT:
I discovered that my problem only occurs when .navigationBarTitleDisplayMode is set to .inline instead of default .large
Screenshot:
Here is an example implementation, not exactly yours because you have complex structures that I was not able to reproduce. I hope you get some good from this example:
//
// ContentView.swift
// Refreshable
//
// Created by Allan Garcia on 11/11/22.
//
import SwiftUI
struct ContentView: View {
#State private var isLoading = true
// You may start the view starting with a loading state, before the data was loaded
#State private var myList = [String]() {
didSet {
isLoading = false
}
}
// Once the data is set isLoading (the loading state) is turned off
var body: some View {
NavigationView {
List {
if isLoading {
ProgressView()
.progressViewStyle(.circular)
.font(.largeTitle)
}
ForEach(myList, id: \.self) { item in
Text(item)
}
}
.listStyle(.plain)
.onAppear {
DispatchQueue.main.async {
isLoading = true
withAnimation {
self.myList = ContentView.fetchedList[0..<10].map { $0.uppercased() }
}
}
// On Appear you will probably fetch "some" data with pagination
}
.refreshable {
DispatchQueue.main.async {
withAnimation {
self.myList = ContentView.fetchedList.map { $0.uppercased() }
// A note here... refreshable is good when new data comes on top. If the data comes from bellow is
// a infinite scrolling approach much more advisable.
}
}
// .refreshable works fine here... ir will fetch more data... here it fetchs all, but is probably a
// good practice to fetch "some" more, and let the user read through until he wants to fetch more and
// trigger refreshable again.
}
}
.padding()
}
static let fetchedList = ["a","abandon","ability","able","abortion","about","above","abroad","absence","absolute","absolutely","absorb","abuse","academic","accept","access","accident","accompany","accomplish","according","account","accurate","accuse","achieve","achievement","acid","acknowledge","acquire","across","act","action","active","activist","activity","actor","actress","actual","actually","ad","adapt","add","addition","additional","address","adequate","adjust","adjustment","administration","administrator","admire","admission","admit","adolescent","adopt","adult","advance","advanced","advantage","adventure","advertising","advice","advise","adviser","advocate","affair","affect","afford","afraid","African","African-American","after","afternoon","again","against","age","agency","agenda","agent","aggressive","ago","agree","agreement","agricultural","ah","ahead","aid","aide","AIDS","aim","air","aircraft","airline","airport","album","alcohol","alive","all","alliance","allow","ally","almost","alone","along","already","also","alter","alternative","although","always","AM","amazing","American","among","amount","analysis","analyst","analyze","ancient","and","anger","angle","angry","animal","anniversary","announce","annual","another","answer","anticipate","anxiety","any","anybody","anymore","anyone","anything","anyway","anywhere","apart","apartment","apparent","apparently","appeal","appear","appearance","apple","application","apply","appoint","appointment","appreciate","approach","appropriate","approval","approve","approximately","Arab","architect","area","argue","argument","arise","arm","armed","army","around","arrange","arrangement","arrest","arrival","arrive","art","article","artist","artistic","as","Asian","aside","ask","asleep","aspect","assault","assert","assess","assessment","asset","assign","assignment","assist","assistance","assistant","associate","association","assume","assumption","assure","at","athlete","athletic","atmosphere","attach","attack","attempt","attend","attention","attitude","attorney","attract","attractive","attribute","audience","author","authority","auto","available","average","avoid","award","aware","awareness","away","awful","baby","back","background","bad","badly","bag","bake","balance","ball","ban","band","bank","bar","barely","barrel","barrier","base","baseball","basic","basically","basis","basket","basketball","bathroom","battery","battle","be","beach","bean","bear","beat","beautiful","beauty","because","become","bed","bedroom","beer","before","begin","beginning","behavior","behind","being","belief","believe","bell","belong","below","belt","bench","bend","beneath","benefit","beside","besides","best","bet","better","between","beyond","Bible","big","bike","bill","billion","bind","biological","bird","birth","birthday","bit","bite","black","blade","blame","blanket","blind","block","blood","blow","blue","board","boat","body","bomb","bombing","bond","bone","book","boom","boot","border","born","borrow","boss","both","bother","bottle","bottom","boundary","bowl","box","boy","boyfriend","brain","branch","brand","bread","break","breakfast","breast","breath","breathe","brick","bridge","brief","briefly","bright","brilliant","bring","British","broad","broken","brother","brown","brush","buck","budget","build","building","bullet","bunch","burden","burn","bury","bus","business","busy","but","butter","button","buy","buyer","by","cabin","cabinet","cable","cake","calculate","call","camera","camp","campaign","campus","can","Canadian","cancer","candidate","cap","capability","capable","capacity","capital","captain","capture","car","carbon","card","care","career","careful","carefully","carrier","carry","case","cash","cast","cat","catch","category","Catholic","cause","ceiling","celebrate","celebration","celebrity","cell","center","central","century","CEO","ceremony","certain","certainly","chain","chair","chairman","challenge","chamber","champion","championship","chance","change","changing","channel","chapter","character","characteristic","characterize","charge","charity","chart","chase","cheap","check","cheek","cheese","chef","chemical","chest","chicken","chief","child","childhood","Chinese","chip","chocolate","choice","cholesterol","choose","Christian","Christmas","church","cigarette","circle","circumstance","cite","citizen","city","civil","civilian","claim","class","classic","classroom","clean","clear","clearly","client","climate","climb","clinic","clinical","clock","close","closely","closer","clothes","clothing","cloud","club","clue","cluster","coach","coal","coalition","coast","coat","code","coffee","cognitive","cold","collapse","colleague","collect","collection","collective","college","colonial","color","column","combination","combine","come","comedy","comfort","comfortable","command","commander","comment","commercial","commission","commit","commitment","committee","common","communicate","communication","community","company","compare","comparison","compete","competition","competitive","competitor","complain","complaint","comp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fan","fantasy","far","farm","farmer","fashion","fast","fat","fate","father","fault","favor","favorite","fear","feature","federal","fee","feed","feel","feeling","fellow","female","fence","few","fewer","fiber","fiction","field","fifteen","fifth","fifty","fight","fighter","fighting","figure","file","fill","film","final","finally","finance","financial","find","finding","fine","finger","finish","fire","firm","first","fish","fishing","fit","fitness","five","fix","flag","flame","flat","flavor","flee","flesh","flight","float","floor","flow","flower","fly","focus","folk","follow","following","food","foot","football","for","force","foreign","forest","forever","forget","form","formal","formation","former","formula","forth","fortune","forward","found","foundation","founder","four","fourth","frame","framework","free","freedom","freeze","French","frequency","frequent","frequently","fresh","friend","friendly","friendship","from","front","fruit","frustration","fuel","full","fully","fun","function","fund","fundamental","funding","funeral","funny","furniture","furthermore","future","gain","galaxy","gallery","game","gang","gap","garage","garden","garlic","gas","gate","gather","gay","gaze","gear","gender","gene","general","generally","generate","generation","genetic","gentleman","gently","German","gesture","get","ghost","giant","gift","gifted","girl","girlfriend","give","given","glad","glance","glass","global","glove","go","goal","God","gold","golden","golf","good","government","governor","grab","grade","gradually","graduate","grain","grand","grandfather","grandmother","grant","grass","grave","gray","great","greatest","green","grocery","ground","group","grow","growing","growth","guarantee","guard","guess","guest","guide","guideline","guilty","gun","guy","habit","habitat","hair","half","hall","hand","handful","handle","hang","happen","happy","hard","hardly","hat","hate","have","he","head","headline","headquarters","health","healthy","hear","hearing","heart","heat","heaven","heavily","heavy","heel","height","helicopter","hell","hello","help","helpful","her","here","heritage","hero","herself","hey","hi","hide","high","highlight","highly","highway","hill","him","himself","hip","hire","his","historian","historic","historical","history","hit","hold","hole","holiday","holy","home","homeless","honest","honey","honor","hope","horizon","horror","horse","hospital","host","hot","hotel","hour","house","household","housing","how","however","huge","human","humor","hundred","hungry","hunter","hunting","hurt","husband","hypothesis","I","ice","idea","ideal","identification","identify","identity","ie","if","ignore","ill","illegal","illness","illustrate","image","imagination","imagine","immediate","immediately","immigrant","immigration","impact","implement","implication","imply","importance","important","impose","impossible","impress","impression","impressive","improve","improvement","in","incentive","incident","include","including","income","incorporate","increase","increased","increasing","increasingly","incredible","indeed","independence","independent","index","Indian","indicate","indication","individual","industrial","industry","infant","infection","inflation","influence","inform","information","ingredient","initial","initially","initiative","injury","inner","innocent","inquiry","inside","insight","insist","inspire","install","instance","instead","institution","institutional","instruction","instructor","instrument","insurance","intellectual","intelligence","intend","intense","intensity","intention","interaction","interest","interested","interesting","internal","international","Internet","interpret","interpretation","intervention","interview","into","introduce","introduction","invasion","invest","investigate","investigation","investigator","investment","investor","invite","involve","involved","involvement","Iraqi","Irish","iron","Islamic","island","Israeli","issue","it","Italian","item","its","itself","jacket","jail","Japanese","jet","Jew","Jewish","job","join","joint","joke","journal","journalist","journey","joy","judge","judgment","juice","jump","junior","jury","just","justice","justify","keep","key","kick","kid","kill","killer","killing","kind","king","kiss","kitchen","knee","knife","knock","know","knowledge","lab","label","labor","laboratory","lack","lady","lake","land","landscape","language","lap","large","largely","last","late","later","Latin","latter","laugh","launch","law","lawn","lawsuit","lawyer","lay","layer","lead","leader","leadership","leading","leaf","league","lean","learn","learning","least","leather","leave","left","leg","legacy","legal","legend","legislation","legitimate","lemon","length","less","lesson","let","letter","level","liberal","library","license","lie","life","lifestyle","lifetime","lift","light","like","likely","limit","limitation","limited","line","link","lip","list","listen","literally","literary","literature","little","live","living","load","loan","local","locate","location","lock","long","long-term","look","loo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}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
Related
How to update filtered list in swiftui, when the value in the filter is changed?
Usual caveat of being new to swiftui and apologies is this is a simple question. I have a view where I have a date picker, as well as two arrows to increase/decrease the day. When this date is update, I am trying to filter a list of 'sessions' from the database which match the currently displayed date. I have a filteredSessions variable which applies a filter to all 'sessions' from the database. However I do not seem to have that filter refreshed each time the date is changed. I have the date to be used stored as a "#State" object in the view. I thought this would trigger the view to update whenever that field is changed? However I have run the debugger and found the 'filteredSessions' variable is only called once, and not when the date is changed (either by the picker or the buttons). Is there something I'm missing here? Do I need a special way to 'bind' this date value to the list because it isn't directly used by the display? Code below. Thanks import SwiftUI struct TrainingSessionListView: View { #StateObject var viewModel = TrainingSessionsViewModel() #State private var displayDate: Date = Date.now #State private var presentAddSessionSheet = false private var dateManager = DateManager() private let oneDay : Double = 86400 private var addButton : some View { Button(action: { self.presentAddSessionSheet.toggle() }) { Image(systemName: "plus") } } private var decreaseDayButton : some View { Button(action: { self.decreaseDay() }) { Image(systemName: "chevron.left") } } private var increaseDayButton : some View { Button(action: { self.increaseDay() }) { Image(systemName: "chevron.right") } } private func sessionListItem(session: TrainingSession) -> some View { NavigationLink(destination: TrainingSessionDetailView(session: session)) { VStack(alignment: .leading) { Text(session.title) .bold() Text("\(session.startTime) - \(session.endTime)") } } } private func increaseDay() { self.displayDate.addTimeInterval(oneDay) } private func decreaseDay() { self.displayDate.addTimeInterval(-oneDay) } var body: some View { NavigationView { VStack { HStack { Spacer() decreaseDayButton Spacer() DatePicker("", selection: $displayDate, displayedComponents: .date) .labelsHidden() Spacer() increaseDayButton Spacer() } .padding(EdgeInsets(top: 25, leading: 0, bottom: 0, trailing: 0)) Spacer() ForEach(filteredSessions) { session in sessionListItem(session: session) } Spacer() } .navigationTitle("Training Sessions") .navigationBarTitleDisplayMode(.inline) .navigationBarItems(trailing: addButton) .sheet(isPresented: $presentAddSessionSheet) { TrainingSessionEditView() } } } var filteredSessions : [TrainingSession] { print("filteredSessions called") return viewModel.sessions.filter { $0.date == dateManager.dateToStr(date: displayDate) } } } struct TrainingSessionListView_Previews: PreviewProvider { static var previews: some View { TrainingSessionListView() } }
There are two approaches and for your case and for what you described I would take the first one. I only use the second approach if I have more complex filters and tasks You can directly set the filter on the ForEach this will ensure it gets updated whenever the displayDate changes. ForEach(viewModel.sessions.filter { $0.date == dateManager.dateToStr(date: displayDate) }) { session in sessionListItem(session: session) } Or you can like CouchDeveloper said, introduce a new state variable and to trigger a State change you would use the willSet extension (doesn't exist in binding but you can create it) For this second option you could do something like this. Start create the Binding extension for the didSet and willSet extension Binding { func didSet(execute: #escaping (Value) ->Void) -> Binding { return Binding( get: { return self.wrappedValue }, set: { let snapshot = self.wrappedValue self.wrappedValue = $0 execute(snapshot) } ) } func willSet(execute: #escaping (Value) ->Void) -> Binding { return Binding( get: { return self.wrappedValue }, set: { execute($0) self.wrappedValue = $0 } ) } } Introduce the new state variable #State var filteredSessions: [TrainingSession] = [] // removing the other var We introduce the function that will update the State var func filterSessions(_ filter: Date) { filteredSessions = viewModel.sessions.filter { $0.date == dateManager.dateToStr(date: date) } } We update the DatePicker to run the function using the willSet DatePicker("", selection: $displayDate.willSet { self.filterSessions($0) }, displayedComponents: .date) And lastly we add a onAppear so we fill the filteredSessions immidiatly (if you want) .onAppear { filterSessions(displayDate) } // uses the displayDate that you set as initial value Don't forget in your increaseDay() and decreaseDay() functions to add the following after the addTimeInterval self.filterSessions(displayDate) As I said, this second method might be better for more complex filters
Thank you all for your responses. I'm not sure what the issue was originally but it seems updating my view to use Firebase's #FirestoreQuery to access the collection updates the var filteredSessions... much better than what I had before. New code below seems to be working nicely now. import SwiftUI import FirebaseFirestoreSwift struct TrainingSessionListView: View { #FirestoreQuery(collectionPath: "training_sessions") var sessions : [TrainingSession] #State private var displayDate: Date = Date.now #State private var presentAddSessionSheet = false private var dateManager = DateManager() private let oneDay : Double = 86400 private var addButton : some View { Button(action: { self.presentAddSessionSheet.toggle() }) { Image(systemName: "plus") } } private var todayButton : some View { Button(action: { self.displayDate = Date.now }) { Text("Today") } } private var decreaseDayButton : some View { Button(action: { self.decreaseDay() }) { Image(systemName: "chevron.left") } } private var increaseDayButton : some View { Button(action: { self.increaseDay() }) { Image(systemName: "chevron.right") } } private func sessionListItem(session: TrainingSession) -> some View { NavigationLink(destination: TrainingSessionDetailView(sessionId: session.id!)) { VStack(alignment: .leading) { Text(session.title) .bold() Text("\(session.startTime) - \(session.endTime)") } } } private func increaseDay() { self.displayDate.addTimeInterval(oneDay) } private func decreaseDay() { self.displayDate.addTimeInterval(-oneDay) } var body: some View { NavigationView { VStack { HStack { Spacer() decreaseDayButton Spacer() DatePicker("", selection: $displayDate, displayedComponents: .date) .labelsHidden() Spacer() increaseDayButton Spacer() } .padding(EdgeInsets(top: 25, leading: 0, bottom: 10, trailing: 0)) if filteredSessions.isEmpty { Spacer() Text("No Training Sessions found") } else { List { ForEach(filteredSessions) { session in sessionListItem(session: session) } } } Spacer() } .navigationTitle("Training Sessions") .navigationBarTitleDisplayMode(.inline) .navigationBarItems(leading: todayButton, trailing: addButton) .sheet(isPresented: $presentAddSessionSheet) { TrainingSessionEditView() } } } var filteredSessions : [TrainingSession] { return sessions.filter { $0.date == dateManager.dateToStr(date: displayDate)} } } struct TrainingSessionListView_Previews: PreviewProvider { static var previews: some View { TrainingSessionListView() } }
Why fullScreenCover always take first index from array?
Why fullScreenCover always take just first index of an array? This is some example of code: struct TestView: View { #State private var isFullScreen: Bool = false var body: some View { VStack{ ForEach(0..<5, id:\.self) { number in VStack{ Text("\(number)") .background(.red) .foregroundColor(.white) .padding(20) .onTapGesture { isFullScreen.toggle() } } .fullScreenCover(isPresented: $isFullScreen) { test2View(title: number) } } } } } This is the code of test2View: struct test2View: View { var title:Int var body: some View { Text("\(title)") } } Whenever I click on any number it always show just 0, but when I make navigationLink instead of fullScreenCover, it works as expected, but navigationLink isn't a solution for my problem, I want that to be fullScreenCover.
It's because fullScreenCover is using a single isFullScreen for each number so only the first one works. Fix by adding a third intermediary View to hold an isFullScreen bool for each number, e.g. struct TestView: View { var body: some View { VStack{ ForEach(0..<5) { number in TestView2(number: number) } } } } struct TestView2: View { let number: Int #State private var isFullScreen: Bool = false var body: some View { Text("\(number, format: .number)") .background(.red) .foregroundColor(.white) .padding(20) .onTapGesture { isFullScreen.toggle() } .fullScreenCover(isPresented: $isFullScreen) { TestView3(number: number) } } } struct TestView3: View { let number: Int var body: some View { Text("\(number, format: .number)") } }
I found a solution using .fullScreenCover item parameter like this: struct TestView: View { #State private var isFullScreen: Int? = nil var body: some View { VStack{ ForEach(0..<5, id:\.self) { number in VStack{ Text("\(number)") .background(.red) .foregroundColor(.white) .padding(20) .onTapGesture { isFullScreen = number } } .fullScreenCover(item: $isFullScreen) { item in test2View(title: item) } } } } }
ToolbarItemGroup in .toolbar {} doesn't work in a Sheet
I'm using SwiftUI 3.0, Swift 5.5 and Xcode 13.2, tested on iOS 15.3 iPhone device, and iOS 15.2 iPhone simulator. I have tested the following. This is a view, with a TextField, a focused state and a .toolbar import SwiftUI struct test: View { #State private var name = "Taylor Swift" #FocusState var isInputActive: Bool var body: some View { TextField("Enter your name", text: $name) .textFieldStyle(.roundedBorder) .focused($isInputActive) .toolbar { ToolbarItemGroup(placement: .keyboard) { Spacer() Button(name) { isInputActive = false } } } } } struct test_Previews: PreviewProvider { static var previews: some View { test() } } It works perfectly as expected and it shows a button, with whatever text is typed in the TextField. Then, when it's displayed in a sheet, there is no toolbar, though it is the same code. This is the sheet example: import SwiftUI struct test: View { #State private var name = "Taylor Swift" #FocusState var isInputActive: Bool #State var isSheetPresented: Bool = false var body: some View { VStack { Button { self.isSheetPresented = true } label: { Text("Open Sheet") } } .sheet(isPresented: $isSheetPresented) { TextField("Enter your name", text: $name) .textFieldStyle(.roundedBorder) .focused($isInputActive) .toolbar { ToolbarItemGroup(placement: .keyboard) { Spacer() Button(name) { isInputActive = false } } } } } } struct test_Previews: PreviewProvider { static var previews: some View { test() } }
Toolbar needs a NavigationView And one at the top level. Surrounding the text field.
Today I also experienced the same thing. I had to spent many hours until finally got the solution after reading this question. I wanted to put "Done" button over my keyboard for dismissing it after editing is finish and I used ToolbarItem(placement: .keyboard). In my case, I mistakenly put more than one .toolbar() in different places. And it causing the "Done" button in my sheet becoming disabled, something like this (in simulator): In order to solve the problem, please DO NOT do this: struct SettingsView: View { var body: some View { NavigationView { Form { // Some other codes.. }.navigationBarTitle("Settings", displayMode: .large).toolbar() { // <--- This one is a .toolbar() ToolbarItem{ Button("Cancel"){ self.mode.wrappedValue.dismiss() } }} }.toolbar { // <--- This one another .toolbar() (-_-") ToolbarItem(placement: .keyboard) { // <--- This one is in the WRONG place! Button("Done") { focusedField = nil } } } } } Instead, do the following: struct SettingsView: View { var body: some View { NavigationView { Form { // Some other codes.. }.navigationBarTitle("Settings", displayMode: .large).toolbar() { // Make it into a single .toolbar() 👍🏼 ToolbarItem{ Button("Cancel"){ self.mode.wrappedValue.dismiss() } } ToolbarItem(placement: .keyboard) { Button("Done") { focusedField = nil } } } } } } Hope it helps.
Is there a problem with the way I'm structuring my SwiftUI project that causes .navigationTitle to not appear?
My SwiftUI project refuses to display the navigation title after a certain point. I'm using a navigation structure that I haven't seen implemented on any example projects I've seen, but it makes sense to me and has been seeming to work thus far. My suspicion is that since I'm using a different navigation structure that it is part of the problem. The .navigationBar is there on every page, but the title doesn't display. SettingsView.swift screen I've tried many solutions on Stack Overflow and otherwise. I've tried every combination of .navigationBarHidden(false), .navigationBarTitle() and .navigationBarBackButtonHidden(true) on every page listed below, with no change. I've also tried every location I could think of to place these combinations of .navigationBar modifiers. Recently, I discovered .toolbar, and this changes nothing either. My suspicion is that (as seen in the code snippets below) since the NavigationView is in the first view (WelcomeUI.swift), I can't place the .navigationBarTitle deeper in the code. Below is my current navigation structure, and bits of code from each file: WelcomeUI.swift struct WelcomeUI: View { var body: some View { NavigationView { VStack { //NavigationLink(destination: SignupUI(), label: { //Text("Sign Up") //} NavigationLink(destination: LoginUI(), label: { Text("Log In") } } } } } LoginUI.swift struct LoginUI: View { var body: some View { VStack { NavigationLink(destination: MainUI(), label: { Text("Log In") }) //Button(action: { ... } } .navigationBarHidden(false) } } Note: SignupUI.swift is essentially the same as LoginUI.swift MainUI.swift struct MainUI: View { var body: some View { TabView { //SpendingView() //.tabItem { //Image(...) //Text("Spending") //} //SavingView() //.tabItem { //Image(...) //Text("Saving") //} //AddView() //.tabItem { //Image(...) //Text("Add") //} //EditView() //.tabItem { //Image(...) //Text("Edit") //} SettingsView() .tabItem { //Image(...) Text("Settings") } } .navigationBarBackButtonHidden(true) } } Note: All views in MainUI.swift are structured the same. SettingsView.swift struct SettingsView: View { var body: some View { ZStack { Form { Section(header: Text("Section Header")) { NavigationLink(destination: WelcomeUI()) { Text("Setting Option") } } Section { //Button("Log Out") { //self.logout() //} Text("Log Out") } } .navigationBarTitle("Settings") // This has no effect on code no matter where it is place in SettingsView.swift } } } I should also note that only the pages after MainUI.swift is affected by this. WelcomeUI.swift and LoginUI.swift work as expected.
Look at the MainUI navigationTitle. I just put a title in every View to find what was going on. import SwiftUI struct SubSpendingView: View { var body: some View { ScrollView{ Text("SubSpendingView") }.navigationBarTitle("SubSpending" //, displayMode: .inline ) } } struct SpendingView: View { var body: some View { ScrollView{ Text("SpendingView") NavigationLink("subSpending", destination: SubSpendingView()) }.padding() } } struct WelcomeUI: View { var body: some View { NavigationView { VStack { //NavigationLink(destination: SignupUI(), label: { //Text("Sign Up") //} NavigationLink(destination: LoginUI(), label: { Text("Go to Log In") }) }.navigationTitle(Text("WelcomeUI")) } } } struct SettingsView: View { var body: some View { VStack{ ZStack { Form { Section(header: Text("Section Header")) { NavigationLink(destination: WelcomeUI()) { Text("Setting Option") } } Section { //Button("Log Out") { //self.logout() //} Text("Log Out") } } Button("say-high", action: {print("Hi")}) // This has no effect on code no matter where it is place in SettingsView.swift } }//.navigationBarTitle("Settings") } } struct LoginUI: View { var body: some View { VStack { NavigationLink(destination: MainUI(), label: { Text("Log In") }) //Button(action: { ... } }.navigationTitle(Text("LoginUI")) .navigationBarHidden(false) } } struct MainUI: View { #State var selectedTab: Views = .adding var body: some View { TabView(selection: $selectedTab) { SpendingView() .tabItem { Image(systemName: "bag.circle") Text("Spending") }.tag(Views.spending) //SavingView() //.tabItem { //Image(...) //Text("Saving") //} Text("Adding View") .tabItem { Image(systemName: "plus") Text("Add") }.tag(Views.adding) Text("Edit View") .tabItem { Image(systemName: "pencil") Text("Edit") }.tag(Views.edit) SettingsView() .tabItem { Image(systemName: "gear") Text("Settings") }.tag(Views.settings) } //This overrides the navigationTitle in the tabs .navigationBarTitle(Text(selectedTab.rawValue) //, displayMode: .inline ) .navigationBarBackButtonHidden(true) } } enum Views: String{ case settings = "Settings" case spending = "Spending" case adding = "Add" case edit = "Edit" } struct PaddyNav: View { var body: some View { WelcomeUI() //Wont work .navigationTitle(Text("PaddyNav")) } } struct PaddyNav_Previews: PreviewProvider { static var previews: some View { PaddyNav() } }
UI changes with ObservableObject just after switching tabs
I have a ObservableObject that I use to update my UI when new data is sent from the server (an a class which contains an array of custom structs). For some reason, when the data is sent, the ContentView's body is called, but the data isn't changed. I even added a print statement to check if the data that the array contains is right and it is. When I try to switch to another tab on my TabView, and then switch back to the main view, the UI does get updated. Does anybody know why the UI updates just when I switch tabs, although the body gets recalled to update the UI when the data changed? HomeView struct HomeView: View { #ObservedObject private var fbData = firebaseData var body: some View { TabView { //Home Tab NavigationView { ScrollView(showsIndicators: false) { ForEach(self.fbData.posts.indices, id: \.self) { postIndex in PostView(post: self.$fbData.posts[postIndex]) .listRowInsets(EdgeInsets()) .padding(.vertical, 5) } } .navigationBarTitle("MyPhotoApp", displayMode: .inline) .navigationBarItems(leading: Button(action: { print("Camera btn pressed") }, label: { Image(systemName: "camera") .font(.title) }) , trailing: Button(action: { print("Messages btn pressed") }, label: { Image(systemName: "paperplane") .font(.title) }) ) } . tabItem({ Image(systemName: "house") .font(.title) }) Text("Search").tabItem { Image(systemName: "magnifyingglass") .font(.title) } Text("Upload").tabItem { Image(systemName: "plus.app") .font(.title) } Text("Activity").tabItem { Image(systemName: "heart") .font(.title) } Text("Profile").tabItem { Image(systemName: "person") .font(.title) } } .accentColor(.black) .edgesIgnoringSafeArea(.top) } } FirebaseData: class FirebaseData : ObservableObject { #Published var posts = [Post]() let postsCollection = Firestore.firestore().collection("Posts") init() { self.fetchPosts() } //MARK: Fetch Data private func fetchPosts() { self.postsCollection.addSnapshotListener { (documentSnapshot, err) in if err != nil { print("Error fetching posts: \(err!.localizedDescription)") return } else { documentSnapshot!.documentChanges.forEach { diff in if diff.type == .added { let post = self.createPostFromDocument(document: diff.document) self.posts.append(post) } else if diff.type == .modified { self.posts = self.posts.map { (post) -> Post in if post.id == diff.document.documentID { return self.createPostFromDocument(document: diff.document) } else { return post } } } else if diff.type == .removed { for index in self.posts.indices { if self.posts[index].id == diff.document.documentID { self.posts.remove(at: index) } } } } } } }
Your code example doesn't help to find the bug. Finally I've got how to demonstrate it. First, do it the "proper way" (copy - paste - try it yourself) import SwiftUI struct Data: Identifiable { let id = UUID() let text: String } class Model: ObservableObject { #Published var data: [Data] = [Data(text: "alfa"), Data(text: "beta")] } struct ContentView: View { #ObservedObject var model = Model() var body: some View { TabView { View1(model: model).tabItem { Text("View 1") } View2(model: model).tabItem { Text("View 2") } } } } struct View1: View { #ObservedObject var model: Model var body: some View { VStack { Text("View 1").font(.largeTitle) DataView(data: model.data) Button(action: { self.model.data.append(Data(text: String("ABCDEFGH".shuffled()))) }) { Text("Add random data") } } } } struct View2: View { #ObservedObject var model: Model var body: some View { VStack { Text("View 2").font(.largeTitle) DataView(data: model.data.filter({ (item) -> Bool in item.text.count < 4 })) // to distinguish from other DataView !! it seems to be a bug in SwiftUI // try to remove it to see the difference .id("view2") Button(action: { self.model.data.append(Data(text: String("ABC".shuffled()))) }) { Text("Add random data") } } } } struct DataView: View { var data: [Data] var body: some View { List { ForEach(data) { (item) in Text(item.text) } } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } } I works as it should, you can modify the data from each tab, you see refreshed data, etc. removing "fixed - user defined" .id modifier, it changes the behaviour dramatically This looks like a serious bug in SwiftUI ...
I think is SwiftUI bug. I solve this problem like this. Instead of rendering your PostView(post: self.$fbData.posts[postIndex]) implement post view inside ForEach. ForEach(self.fbData.posts.indices, id: \.self) { postIndex in Text(self.$fbData.posts[postIndex].comment) Text(self.$fbData.posts[postIndex].date) .... }