显示白色框的后退栏按钮
Back bar button showing a white box
我有一个 SwiftUI 项目，但它显示一个带有后退栏按钮的大白框。
有谁知道如何修复它（Xcode 版本 12.5）？
图片：
我的代码：
import SwiftUI
import Firebase
struct ContentView: View {
var body: some View {
Home()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
struct Home : View {
@State var show = false
@State var status = UserDefaults.standard.value(forKey: "status") as? Bool ?? false
var body: some View{
NavigationView{
VStack{
if self.status{
Homescreen()
}
else{
ZStack{
NavigationLink(destination: SignUp(show: self.$show), isActive: self.$show) {
Text("")
}
.hidden()
Login(show: self.$show)
}
}
}
.navigationBarTitle("")
.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.onAppear {
NotificationCenter.default.addObserver(forName: NSNotification.Name("status"), object: nil, queue: .main) { (_) in
self.status = UserDefaults.standard.value(forKey: "status") as? Bool ?? false
}
}
}
}
}
struct Homescreen : View {
var body: some View{
VStack{
Text("Logged successfully")
.font(.title)
.fontWeight(.bold)
Button(action: {
try! Auth.auth().signOut()
UserDefaults.standard.set(false, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}) {
Text("Log out")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
}
}
}
struct Login : View {
@State var color = Color.black.opacity(0.7)
@State var email = ""
@State var pass = ""
@State var visible = false
@Binding var show : Bool
@State var alert = false
@State var error = ""
var body: some View{
ZStack{
ZStack(alignment: .topTrailing) {
GeometryReader{_ in
VStack{
Text("Log in to your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
TextField("Email", text: self.$email)
.autocapitalization(.none)
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.email != "" ? Color("Color.Color") : self.color,lineWidth: 2))
.padding(.top, 25)
.disableAutocorrection(true)
HStack(spacing: 15){
VStack{
if self.visible{
TextField("Password", text: self.$pass)
.autocapitalization(.none)
}
else{
SecureField("Password", text: self.$pass)
.autocapitalization(.none)
}
}
Button(action: {
self.visible.toggle()
}) {
Image(systemName: self.visible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.pass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
HStack{
Spacer()
Button(action: {
self.reset()
}) {
Text("Forget password")
.fontWeight(.bold)
}
}
.padding(.top, 20)
Button(action: {
self.verify()
}) {
Text("Log in")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
.padding(.horizontal, 25)
}
}
Button(action: {
self.show.toggle()
}) {
Text("Register")
.padding(.vertical)
.frame(width:
UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 400)
.padding(.horizontal, 25)
}
if self.alert{
ErrorView(alert: self.$alert, error: self.$error)
}
}
}
func verify(){
if self.email != "" && self.pass != ""{
Auth.auth().signIn(withEmail: self.email, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}
func reset(){
if self.email != ""{
Auth.auth().sendPasswordReset(withEmail: self.email) { (err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
self.error = "RESET"
self.alert.toggle()
}
}
else{
self.error = "Email Id is empty"
self.alert.toggle()
}
}
}
struct SignUp : View {
@State var color = Color.black.opacity(0.7)
@State var email = ""
@State var pass = ""
@State var repass = ""
@State var visible = false
@State var revisible = false
@Binding var show : Bool
@State var alert = false
@State var error = ""
var body: some View{
ZStack{
ZStack(alignment: .topLeading) {
GeometryReader{_ in
VStack{
Text("Register your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
TextField("Email", text: self.$email)
.autocapitalization(.none)
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.email != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
.disableAutocorrection(true)
HStack(spacing: 15){
VStack{
if self.visible{
TextField("Password", text: self.$pass)
.autocapitalization(.none)
}
else{
SecureField("Password", text: self.$pass)
.autocapitalization(.none)
}
}
Button(action: {
self.visible.toggle()
}) {
Image(systemName: self.visible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.pass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
HStack(spacing: 15){
VStack{
if self.revisible{
TextField("Re-enter", text: self.$repass)
.autocapitalization(.none)
}
else{
SecureField("Re-enter", text: self.$repass)
.autocapitalization(.none)
}
}
Button(action: {
self.revisible.toggle()
}) {
Image(systemName: self.revisible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.repass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
Button(action: {
self.register()
}) {
Text("Register")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
}
.padding(.horizontal, 25)
}
Button(action: {
self.show.toggle()
}) {
}
.padding()
}
if self.alert{
ErrorView(alert: self.$alert, error: self.$error)
}
}
}
func register(){
if self.email != ""{
if self.pass == self.repass{
Auth.auth().createUser(withEmail: self.email, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Password mismatch"
self.alert.toggle()
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}
}
struct ErrorView : View {
@State var color = Color.black.opacity(0.7)
@Binding var alert : Bool
@Binding var error : String
var body: some View{
GeometryReader{_ in
VStack{
HStack{
Text(self.error == "RESET" ? "Message" : "Error")
.font(.title)
.fontWeight(.bold)
Spacer()
}
.padding(.horizontal, 25)
Text(self.error == "RESET" ? "Password reset link has been sent successfully" : self.error)
.padding(.top)
.padding(.horizontal, 25)
Button(action: {
self.alert.toggle()
}) {
Text(self.error == "RESET" ? "Ok" : "Cancel")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 120)
}
.background(Color.white)
.cornerRadius(10)
.padding(.top, 25)
}
.padding(.vertical, 25)
.frame(width: UIScreen.main.bounds.width - 50)
.background(Color.white)
.cornerRadius(15)
.padding(.horizontal, 25)
}
.background(Color.black.opacity(0.35).edgesIgnoringSafeArea(.all))
}
}
您应该改用 .navigationTitle(_:)。
首先删除这段代码：
Text("Register your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
然后在此视图的其他地方，例如在下面的 TextField 上，添加修饰符：
.navigationTitle("Register your account")
结果：
我有一个 SwiftUI 项目，但它显示一个带有后退栏按钮的大白框。
有谁知道如何修复它（Xcode 版本 12.5）？
图片：
我的代码：
import SwiftUI
import Firebase
struct ContentView: View {
var body: some View {
Home()
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
struct Home : View {
@State var show = false
@State var status = UserDefaults.standard.value(forKey: "status") as? Bool ?? false
var body: some View{
NavigationView{
VStack{
if self.status{
Homescreen()
}
else{
ZStack{
NavigationLink(destination: SignUp(show: self.$show), isActive: self.$show) {
Text("")
}
.hidden()
Login(show: self.$show)
}
}
}
.navigationBarTitle("")
.navigationBarHidden(true)
.navigationBarBackButtonHidden(true)
.onAppear {
NotificationCenter.default.addObserver(forName: NSNotification.Name("status"), object: nil, queue: .main) { (_) in
self.status = UserDefaults.standard.value(forKey: "status") as? Bool ?? false
}
}
}
}
}
struct Homescreen : View {
var body: some View{
VStack{
Text("Logged successfully")
.font(.title)
.fontWeight(.bold)
Button(action: {
try! Auth.auth().signOut()
UserDefaults.standard.set(false, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}) {
Text("Log out")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
}
}
}
struct Login : View {
@State var color = Color.black.opacity(0.7)
@State var email = ""
@State var pass = ""
@State var visible = false
@Binding var show : Bool
@State var alert = false
@State var error = ""
var body: some View{
ZStack{
ZStack(alignment: .topTrailing) {
GeometryReader{_ in
VStack{
Text("Log in to your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
TextField("Email", text: self.$email)
.autocapitalization(.none)
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.email != "" ? Color("Color.Color") : self.color,lineWidth: 2))
.padding(.top, 25)
.disableAutocorrection(true)
HStack(spacing: 15){
VStack{
if self.visible{
TextField("Password", text: self.$pass)
.autocapitalization(.none)
}
else{
SecureField("Password", text: self.$pass)
.autocapitalization(.none)
}
}
Button(action: {
self.visible.toggle()
}) {
Image(systemName: self.visible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.pass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
HStack{
Spacer()
Button(action: {
self.reset()
}) {
Text("Forget password")
.fontWeight(.bold)
}
}
.padding(.top, 20)
Button(action: {
self.verify()
}) {
Text("Log in")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
.padding(.horizontal, 25)
}
}
Button(action: {
self.show.toggle()
}) {
Text("Register")
.padding(.vertical)
.frame(width:
UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 400)
.padding(.horizontal, 25)
}
if self.alert{
ErrorView(alert: self.$alert, error: self.$error)
}
}
}
func verify(){
if self.email != "" && self.pass != ""{
Auth.auth().signIn(withEmail: self.email, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}
func reset(){
if self.email != ""{
Auth.auth().sendPasswordReset(withEmail: self.email) { (err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
self.error = "RESET"
self.alert.toggle()
}
}
else{
self.error = "Email Id is empty"
self.alert.toggle()
}
}
}
struct SignUp : View {
@State var color = Color.black.opacity(0.7)
@State var email = ""
@State var pass = ""
@State var repass = ""
@State var visible = false
@State var revisible = false
@Binding var show : Bool
@State var alert = false
@State var error = ""
var body: some View{
ZStack{
ZStack(alignment: .topLeading) {
GeometryReader{_ in
VStack{
Text("Register your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
TextField("Email", text: self.$email)
.autocapitalization(.none)
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.email != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
.disableAutocorrection(true)
HStack(spacing: 15){
VStack{
if self.visible{
TextField("Password", text: self.$pass)
.autocapitalization(.none)
}
else{
SecureField("Password", text: self.$pass)
.autocapitalization(.none)
}
}
Button(action: {
self.visible.toggle()
}) {
Image(systemName: self.visible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.pass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
HStack(spacing: 15){
VStack{
if self.revisible{
TextField("Re-enter", text: self.$repass)
.autocapitalization(.none)
}
else{
SecureField("Re-enter", text: self.$repass)
.autocapitalization(.none)
}
}
Button(action: {
self.revisible.toggle()
}) {
Image(systemName: self.revisible ? "eye.slash.fill" : "eye.fill")
}
}
.padding()
.background(RoundedRectangle(cornerRadius: 4).stroke(self.repass != "" ? Color("Color") : self.color,lineWidth: 2))
.padding(.top, 25)
Button(action: {
self.register()
}) {
Text("Register")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 50)
}
.background(Color.black)
.cornerRadius(10)
.padding(.top, 25)
}
.padding(.horizontal, 25)
}
Button(action: {
self.show.toggle()
}) {
}
.padding()
}
if self.alert{
ErrorView(alert: self.$alert, error: self.$error)
}
}
}
func register(){
if self.email != ""{
if self.pass == self.repass{
Auth.auth().createUser(withEmail: self.email, password: self.pass) { (res, err) in
if err != nil{
self.error = err!.localizedDescription
self.alert.toggle()
return
}
print("success")
UserDefaults.standard.set(true, forKey: "status")
NotificationCenter.default.post(name: NSNotification.Name("status"), object: nil)
}
}
else{
self.error = "Password mismatch"
self.alert.toggle()
}
}
else{
self.error = "Please fill all the contents properly"
self.alert.toggle()
}
}
}
struct ErrorView : View {
@State var color = Color.black.opacity(0.7)
@Binding var alert : Bool
@Binding var error : String
var body: some View{
GeometryReader{_ in
VStack{
HStack{
Text(self.error == "RESET" ? "Message" : "Error")
.font(.title)
.fontWeight(.bold)
Spacer()
}
.padding(.horizontal, 25)
Text(self.error == "RESET" ? "Password reset link has been sent successfully" : self.error)
.padding(.top)
.padding(.horizontal, 25)
Button(action: {
self.alert.toggle()
}) {
Text(self.error == "RESET" ? "Ok" : "Cancel")
.padding(.vertical)
.frame(width: UIScreen.main.bounds.width - 120)
}
.background(Color.white)
.cornerRadius(10)
.padding(.top, 25)
}
.padding(.vertical, 25)
.frame(width: UIScreen.main.bounds.width - 50)
.background(Color.white)
.cornerRadius(15)
.padding(.horizontal, 25)
}
.background(Color.black.opacity(0.35).edgesIgnoringSafeArea(.all))
}
}
您应该改用 .navigationTitle(_:)。
首先删除这段代码：
Text("Register your account")
.font(.title)
.fontWeight(.bold)
.padding(.top, 35)
然后在此视图的其他地方，例如在下面的 TextField 上，添加修饰符：
.navigationTitle("Register your account")
结果：