How can we prevent the view from going to the previous view after user clicks OK button on camera access prompt? Here is our code:
func RequestCameraAccess() {
AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo, completionHandler: { (granted: Bool) -> Void in
if granted == true {
print("User Granted")
DispatchQueue.main.async {
self.Cam();
}
} else {
print("User Rejected")
DispatchQueue.main.async {
self.image1.isHidden = true
}
}
})
}
Thanks
the problem was that in the moment of camera access granting the following method occurs:
func applicationDidBecomeActive(_ application: UIApplication) {}
In my application I had logic to move to home screen in case of inactivity for a certain amount of time.
Thanks anyway.
Related
I am trying to figure out how to display errors such as those found in the App Store Store class and Persistence.swift file in a single reporting module. Some of my errors within views use an environment object to tie the error production to the error reporting, but this isn’t feasible with errors in different classes.
So any pointers on handling these types of errors would be much appreciated.
Below is an example of my process to report an error within a view
// the save button has been pressed
struct saveButton: View {
#Environment(\.managedObjectContext) var viewContext
#EnvironmentObject var errorHandling: ErrorHandling
var body: some View {
// prepping data for save to core data
do {
try viewContext.save()
} catch {
// report: Unable to Save Transaction
self.errorHandling.handle(error: AppError.saveTransactionError)
}
The App Store purchase method (below) may produce two errors that I would like to display with my app. This is the type of logic that I need help display the error within a view
#MainActor
func purchase() {
Task.init {
guard let product = products.first else {
return
}
guard AppStore.canMakePayments else {
return
}
do {
let result = try await product.purchase()
switch result {
case .success(let verification):
switch verification {
case .verified(let transaction):
await transaction.finish()
// save to user defaults
self.purchasedIds = transaction.productID
break
case .unverified:
// throw PurchaseError.failed
// FIX: report error (Unable to purchase verification failed)
break
}
break
case .userCancelled:
break
// asked to buy (setting on phone prevents purchases)
case .pending:
break
default:
break
}
}
catch {
print(error.localizedDescription)
// FIX: report error (Unable to Complete Purchase)
}
}
}
enum AppError: LocalizedError {
case storePurchaseError
case storeVerificationError
var errorDescription: String? {
switch self {
case .storePurchaseError:
return NSLocalizedString("Store Purchase Error", comment: "")
case .storeVerificationError:
return NSLocalizedString("Store Verification Error", comment: "")
}
}
}
Below is some code I have been using to display an alert
struct ErrorAlert: Identifiable {
var id = UUID()
var message: String
var dismissAction: (() -> Void)?
}
class ErrorHandling: ObservableObject {
#Published var currentAlert: ErrorAlert?
func handle(error: Error) {
currentAlert = ErrorAlert(message: error.localizedDescription)
}
}
struct HandleErrorsByShowingAlertViewModifier: ViewModifier {
#StateObject var errorHandling = ErrorHandling()
func body(content: Content) -> some View {
content
.environmentObject(errorHandling)
.background(
EmptyView()
.alert(item: $errorHandling.currentAlert) { currentAlert in
Alert(
title: Text("Error"),
message: Text(currentAlert.message),
dismissButton: .default(Text("Ok")) {
currentAlert.dismissAction?()
}
)
}
)
}
}
extension View {
func withErrorHandling() -> some View {
modifier(HandleErrorsByShowingAlertViewModifier())
}
}
I have a very troubling problem. I have searched for days on how to solve it. I have some code that I want to run every time the app is opened, not just when the app is launched for the first time. I've basically tried everything available. I've tried scenePhase, I've tried AppDelegate, I've tried onAppear, I've tried init and custom extensions to the View class, I've even tried simply running a function in the view, but nothing is working. I'll show my code here.
#main
struct CouponDeckApp: App {
#UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
#Environment(\.scenePhase) private var scenePhase
var body: some Scene {
WindowGroup {
AppContentView()
}
}
}
struct AppContentView: View {
init() {
let userDefaults = UserDefaults.standard
if userDefaults.value(forKey: "hour") == nil { // 1
userDefaults.set(9, forKey: "hour") // 2
}
// 3
if userDefaults.value(forKey: "minute") == nil {
userDefaults.set(30, forKey: "minute")
}
}
#State var currentview: String = "Main"
var body: some View {
Group {
switch currentview {
case "Main":
MainView(currentview: $currentview)
case "Form":
FormView(currentview: $currentview)
case "Settings":
SettingsView(currentview: $currentview)
default:
if currentview.contains("Coupon") {
CouponView(currentview: $currentview)
}
else {
EditView(currentview: $currentview)
}
}
}
}
}
//MainView(), CouponView(), FormView(), etc.
I'm starting to suspect that the problem is with the switch statement in AppContentView that allows you to move between the different views.
Does anyone know:
A. Why this is happening,
B. How to fix it, or
C. Another alternative?
Thanks in advance!
P.S. I'm running my code on the simulator.
Here is a very simple way, using native scenePhase, I did not make it more complicated. You can use Preference method as well for better result! But onChange is good enough for this example:
struct ContentView: View {
#Environment(\.scenePhase) var scenePhase
var body: some View {
Text("Welcome to my App!")
.onAppear() { customFunction() }
.onChange(of: scenePhase) { newPhase in
if newPhase == .active {
customFunction()
}
}
}
}
func customFunction() {
print("App is opened!")
}
The simple problem was that it doesn't work when you close out of the app. I realized if you just exit the app but don't completely close out of it, it works just fine.
I also learned about the NotificationCenter's applications to this. By triggering a response when UIApplication sends out the willEnterForegroundNotification by using the onReceive method, you can trigger a response that way.
Do it in your AppDelegate's application(_:didFinishLaunchingWithOptions:).
I have been searching a lot for this. I am using a pure swiftUI App that doesn't have the classic AppDelegate.
I have been creating a manual appDelegate to install Firebase and it has worked like a charm for long time. I recently added notifications support and I am having a problem. The notification approval process works just fine and I have been able to send notifications on simulator, but when trying to send push notification on a real device I need the tokenID and didRegisterForRemoteNotificationsWithDeviceToken seems to never being called even if I get the print confirmation that I successfully registered.
Please Help. Been trying a lot of Wifi on/off etc.. It seems difficult to implement this in pure SwiftUI app with no dedicated AppDelegate section.
import SwiftUI
import Firebase
import UserNotifications
#main
struct KidBooksApp: App {
#UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
var body: some Scene {
WindowGroup {
let viewModel = AppViewModel()
withAnimation(.easeInOut(duration: transitionTime())) {
//TextComposeView()
//ImageChooserView()
ContentView()
.transition(.fly)
//.transition(.fly)
.environmentObject(viewModel)
}
}
}
}
class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) -> Bool {
registerForPushNotifications()
FirebaseApp.configure()
return true
}
func application(_ application: UIApplication,
didRegisterForRemoteNotificationsWithDeviceToken
deviceToken: Data) {
print("test success")
let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) }
let token = tokenParts.joined()
print("Device Token: \(token)")
}
func application(
_ application: UIApplication,
didFailToRegisterForRemoteNotificationsWithError error: Error
) {
print("test error")
print("Failed to register: \(error)")
}
func registerForPushNotifications() {
UNUserNotificationCenter.current()
.requestAuthorization(
options: [.alert, .sound, .badge]) { [self] granted, _ in
print("Permission granted: \(granted)")
guard granted else { return }
self.getNotificationSettings()
}
}
func getNotificationSettings() {
UNUserNotificationCenter.current().getNotificationSettings { settings in
print("Notification settings: \(settings)")
guard settings.authorizationStatus == .authorized else { return }
DispatchQueue.main.async {
UIApplication.shared.registerForRemoteNotifications()
print("Registered: \(UIApplication.shared.isRegisteredForRemoteNotifications)")
}
}
}
}
/*
DEBUG CONSOLE PRINT :
Permission granted: true
Notification settings: <UNNotificationSettings: 0x16de61780; authorizationStatus: Authorized, notificationCenterSetting: Enabled, soundSetting: Enabled, badgeSetting: Enabled, lockScreenSetting: Enabled, carPlaySetting: NotSupported, announcementSetting: NotSupported, criticalAlertSetting: NotSupported, alertSetting: Enabled, alertStyle: Banner, groupingSetting: Default providesAppNotificationSettings: No>
Registered: true
*/
I'm trying to dismiss a .sheet in SwiftUI, after calling an async process to confirm the user's MFA code. (I'm using the AWS Amplify Framework).
I have a binding variable set on the main view, and reference it in the view the sheet presents with #Binding var displayMFAView: Bool. I have an authentication helper that tracks the user state: #EnvironmentObject var userAuthHelper: UserAuthHelper.
The following code dismisses the sheet as expected:
func confirmMFACode(verificationCode: String) {
// Code to confifm MFA...
print("User confirmed MFA")
self.userAuthHelper.isSignedIn = true
self.displayMFAView = false
}
However, if I call the auth process via Amplify's confirmSignIn method,
func confirmVerificationMFA(verificationCode: String) {
AWSMobileClient.default().confirmSignIn(challengeResponse: verificationCode) { (signInResult, error) in
if let error = error as? AWSMobileClientError {
// ... error handling ...
} else if let signInResult = signInResult {
switch (signInResult.signInState) {
case .signedIn:
print("User confirmed MFA")
self.userAuthHelper.isSignedIn = true
self.displayMFAView = false
default:
print("\(signInResult.signInState.rawValue)")
}
}
}
}
the sheet does not get dismissed. I have tried wrapping the variable assignment in DispatchQueue.main.async {..., but that hasn't solved the issue either.
...
DispatchQueue.main.async {
self.userAuthHelper.isSignedIn = true
self.displayMFAView = false
}
...
In fact, this throws the following into my logs:
Publishing changes from background threads is not allowed; make sure to publish values from the main thread (via operators like receive(on:)) on model updates.
Wrapping the switch (... in a DispatchQueue per https://stackoverflow.com/a/58288437/217101 gave me the same warning in my log.
Admittedly I don't have a firm grasp on SwiftUI or AWS Amplify. What am I not understanding?
From what I can tell the async call does something unexpected with the state variables, but not with an EnvironmentObject. So, nstead of #Binding var displayMFAView: Bool, I stored displayMFAView in an EnvironmentObject,
#EnvironmentObject var settings: UserSettings
#State var mfaCode: String = ""
and then can show or hide the .sheet(... by updating a boolean in that object:
Button(action: {
self.signIn() // Async call happens here
self.settings.displayMFAView.toggle()
}) {
Text("Sign In")
}.sheet(isPresented: self.$settings.displayMFAView) {
// Example code to capture text
TextField("Enter your MFA code", text: self.$mfaCode)
}
Button(action: {
self.verifyMFACode(verificationCode: self.mfaCode) // async call
}) {
Text("Confirm")
}
In func verifyMFACode(), I can make an async call to validate my user, then toggle the sheet to disappear on success:
func verifyMFACode(verificationCode: String) {
AWSMobileClient.default().confirmSignIn(challengeResponse: verificationCode) {
...
case .signedIn:
self.settings.displayMFAView.toggle()
...
i have a behavior i cant resolve.
I have a controller (controller 1) where i check some defaults value. if not present (first time use of app: check login and pwd) i present (modal) a settings vc:
IN CONTROLLER 1
override func viewDidAppear(_ animated: Bool) {
if(!isKeyPresentInUserDefaults(key: "username")) {
NSLog("username not present")
let vc = self.storyboard?.instantiateViewController(withIdentifier: "settings") as! SettingsViewController
self.present(vc, animated: true, completion: nil)
}
}
in this vc (controller 2) (also in the main storyboard) i have a button done. When pressed, it is associated to the:
IN CONTROLLER 2: SettingsVc -> ID : settings
#IBAction func doneSettings(sender: AnyObject) {
if(isInternetAvailable()) {
NSLog("internet available")
login { (result) in
switch result
{
case .Success(let result):
//print(result)
self.dismissSelf()
break
case .Failure(let error):
print(error)
break
}
}
}
else {
NSLog("internet not available")
}
}
the dismissSelf func is defined in the Settingsvc as:
func dismissSelf() {
NSLog("dismissSettingsVC")
self.dismiss(animated: false, completion: nil)
}
the login func is defined in another class, dealing with networking stuff and is as is:
func login(completion: #escaping (AsyncResult<[CustomUserObject]>)->())
{
let myUrl = URL(string: "http://www.xxxx.com/api/api.php");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
let postString = "u=login&s=password&cmd=login";
request.httpBody = postString.data(using: String.Encoding.utf8);
let session = URLSession.shared
let task = session.dataTask(with: request as URLRequest){
(data, response, error) -> Void in
if let error = error
{
completion(AsyncResult.Failure(error as NSError?))
} else {
let result: [CustomUserObject] = []//deserialization json data into array of [CustomUserObject]
let responseString = NSString(data: data!, encoding: String.Encoding.utf8.rawValue)
print("*********response data = \(responseString)")
completion(AsyncResult.Success(result))
}
}
task.resume()
}
So, I launch the app for the first time (no login, no pwd in defaults), then the Settingvc is presented. I press the done button with param hardcoded. The login is correctly called, I receive the answer correctly, and on completion i should dismiss the Settingvc.
thing is, i see the NSLOG for dismiss, but the dismiss appears seconds after the network func completion (from 10 secs to up to a minute), which I can't understand. Why such a delay? any idea?
2017-11-27 21:54:33.262892 app[998:211517] username not present
2017-11-27 21:54:36.119754 app[998:211517] internet available
*********response data =
Optional({"cmd":"login","success":"true","message":"login succeded"})
2017-11-27 21:54:38.472306 app[998:211542] dismissSettingsVC
2017-11-27 21:54:48.048095 app[998:211517] username not present
in this case, it took 10 sec to dismiss the Settingsvc after receiving the login results.
another one:
2017-11-27 22:04:20.364097 app[998:211517] internet available
*********response data =
Optional({"cmd":"login","success":"true","message":"login succeded"})
2017-11-27 22:04:22.495642 app[998:212974] dismissSettingsVC
2017-11-27 22:05:00.049177 app[998:211517] username not present
in this other case, it took 38 sec to dismiss the Settingsvc after receiving the login results.
EDITED
I tried not using a vc presented. Instead in controller 1, i added a view that i first set as visible if username in defaults does not exist and then that I will hide after the login completion. in this view, i added a button to call the loginAction.
#IBAction func loginAction(sender: AnyObject) {
if(isInternetAvailable()) {
NSLog("internet available")
login { (result) in
switch result
{
case .Success(let users):
print(users)
self.loginView.isHidden = true
NSLog("login ok: hiding view")
break
case .Failure(let error):
print(error ?? "ERROR")
break
}
}
}
else {
NSLog("internet not available")
}
}
Same result:
I see the completion and the received data:
2017-11-28 18:17:34.314706 cellar[1270:311710] username not present
2017-11-28 18:17:35.066333 cellar[1270:311710] internet available
2017-11-28 18:17:35.076930 cellar[1270:311710] done login
Optional({"cmd":"login","success":"true","message":"login succeded"})
2017-11-28 18:17:37.655829 cellar[1270:311763] login ok: hiding view
the view should be hidden before the NSLOG "login ok: hiding view". Instead, the UI is updated seconds after (about a min, but variable)
What would avoid the UI to be updated for so long as I wait the completion of the network stuff to perform the UI update?
UPDATE:
weird situation:
as soon as I get the network completion result, by changing the orientation, the dismiss appears right away:
Optional({"cmd":"login","success":"true","message":"login succeded"})
2017-11-28 22:28:30.620408 cellar[1461:360470] dismiss
2017-11-28 22:28:31.537588 cellar[1461:360413] username not present
2017-11-28 22:28:32.126759 cellar[1461:360413] [App] if we're in the
real pre-commit handler we can't actually add any new fences due to CA
restriction
your help is much that appreciated. Thanks
Not sure if this is the reason for your problem but it looks like you aren't running the dismiss() call on the main thread. You should call all UI code on the main thread. Wrap it as follows
case .Success(let result):
//print(result)
DispatchQueue.main.async {
self.dismissSelf()
}
break