Anybody can tell me when is the case where Bundle.main.bundleIdentifier will returns nil?
if let domain = Bundle.main.bundleIdentifier {
UserDefaults.standard.removePersistentDomain(forName: domain)
}
With the code above, there are "random cases" where UserDefault was not cleared so I can only assume that the Bundle.main.bundleIdentifier is nil thus the statement were not executed. This is needed in our app otherwise the app will crash if the "old UserDefault" be use and we received number of crash logs because of this.
Thanks!
Related
enter image description here if let tracking_id = activeridedata.tracking_id {
cell.lblTrackingId.text = tracking_id
}
compiler gives fatal error while cell is loading and its due to nil data in model classes. Even after using if let statement, app crashes when nil data appears.
If activeridedata may not exist, declare it as an optional type and use it as follows.
if let tracking_id = activeridedata?.tracking_id { cell.lblTrackingId.text = tracking_id }
It's really hard to find a proper title for this question. Please be easy on me.
The first part is a check to see if an account exists:
Auth.auth().fetchSignInMethods(forEmail: userEmail, completion: {
(providers, error) in
if error != nil {
self.displayAlertMessage(alertTitle: "Unhandled error", alertMessage: "Undefined error #SignUpViewController_0001");
return;
} else if providers != nil {
self.displayAlertMessage(alertTitle: "Error", alertMessage: "This account is not exist.");
return;
}
})
As you can see, I have something named Unhandled error with message Undefined error. I don't know how to name it properly. Can somebody explain that part to me?
The second one is about getting a localized string - any ideas to make it fancy?
Auth.auth().createUser(withEmail: userEmail, password: userPassword) { user, error in if error == nil && user != nil {
self.displayAlertMessage(alertTitle: "Success", alertMessage: "Your account created successfully. We send you a verification email.", dismiss: true);
} else {
self.displayAlertMessage(alertTitle: "Firebase error", alertMessage: "(error!.localizedDescription)");
}
}
Thanks for tips :)
You can handle the Errors this way:
Auth.auth().fetchSignInMethods(forEmail: email, completion: { (response, error) in
if let error = error, let errCode = AuthErrorCode(rawValue: error._code)
{
switch errCode {
case .emailAlreadyInUse:
GeneralHelper.sharedInstance.displayAlertMessage(titleStr: LocalizeConstant.CommonTitles.Alert.rawValue.localizedStr(), messageStr: LocalizeConstant.CommonTitles.Continue.rawValue.localizedStr())
case .accountExistsWithDifferentCredential:
GeneralHelper.sharedInstance.displayAlertMessage(titleStr: LocalizeConstant.CommonTitles.Alert.rawValue.localizedStr(), messageStr: LocalizeConstant.CommonTitles.Continue.rawValue.localizedStr())
default:
break
}
return
}
}
Here I am getting the errCode using AuthErrorCode provided by Firebase itself and then, I am passing in the received error code using error._code. So, now I can get the type of AuthErrorCode. Using this I am making cases like .emailAlreadyInUser, .accountExistsWithDifferentCredential etc. You can just type . and it will show you all the AuthErrorCodes. So, you can simply handle the error codes in this way.
Now, coming to the second part of the question, i.e. getting localized string. You can add localization to Firebase, for that you have to select the language code. Auth.auth().languageCode = "en" //For English. But, I do not think that it gives localized errors as there are many more languages than what Firebase supports. This mainly for sending localized emails.
To handle the localization, you have to create your own method as I did. You can see that I have called a function displayAlertMessage in which I am passing thetitleStr: LocalizeConstant.CommonTitles.Alert.rawValue.localizedStr(), which is a part of localization.
struct LocalizeConstant {
enum CommonTitles: String
{
case Alert = "common_alert"
}
}
This value designates to the key given by me in the localization file. If you do not know about localization, you have to do a Google search on it. Let's say I have two Localizable.strings one is in English and the other one is in French. In Localizable.strings(English), I've written Alert like this:
"common_alert" = "Alert";
And, In French:
"common_alert" = "Alerte!";
So, this is how I have manually added localization in my app. But, to achieve this you have to do two things. 1) You have to set up your appLanguage. 2) You have to call a method which will fetch the values from these keys defined in the Localizable.strings file.
To do this, I have created a method localizedStr(). It is an extension to String and you can use it as follows.
extension String{
func localizedStr() -> String
{
var finalRes = ""
if let path = Bundle.main.path(forResource: Constants.appLang, ofType: "lproj") //Constants.appLang is "en" here for "English", but you can set accordingly.
{
if let bundle = Bundle(path: path)
{
finalRes = NSLocalizedString(self, tableName: nil, bundle: bundle, value: " ", comment: " ")
}
}
return finalRes
}
}
Now, this method localizedStr() will give you a localized string according to your app language. Even, if Firebase provides localized error codes(which I think it does not), it is impossible to get the error description in each language. So this is the best way I came up with. It may not be the best method out there in the world, but it does the task.
P.S.: To optimize this throughout the app, either you can create an extension to AuthErrorCode or you can create a Helper function where you will just pass the error._code and it will return the localized string. I've added the long way so that you can understand everything in the best way.
I am developing a group call application, after I receive ice I have the following problem:
Thread 1: EXC_BAD_ACCESS (code=1, address=0x40)
Is there any way to solve this?
[]
[enter image description here]4
It seems that either participantJoineds has no element at the first index, or .remotePeer is nil.
You should change the line to:
if participantJoindeds.first?.remotePeer?.remoteDescription != nil {
or even better:
if let description = participantJoindeds.first?.remotePeer?.remoteDescription {
If the method should end after this statement has been evaluated, you could also do:
guard let description = participantJoindeds.first?.remotePeer?.remoteDescription else {
participantJoindeds.first?.arrIceCandidate?.append(iceCandidate)
return
}
I have this code
let path = self.userDesktopDirectory + "/Library/Preferences/.GlobalPreferences.plist"
let dictRoot = NSDictionary(contentsOfFile: path)
if let dict = dictRoot{
try print(dict["AppleLocale"] as! String)
}
If the Value "AppleLocale" didnt exists the script crashes. What I must add to "catch" the Error and avoid the crash?
If the Value "AppleLocale" didnt exists the script crashes. What I
must add to "catch" the Error and avoid the crash?
depends on what's the reason for causing the crash. Mentioning that "If the Value AppleLocale didnt exists" means the the reason for the crash would be the force casting:
dict["AppleLocale"] as! String
probably, it has nothing to do with the try, it would be:
Unexpectedly found nil while unwrapping an Optional value
Means that at some point dict["AppleLocale"] could be nil or even if it contains a value as not a string it will crash (optional). You have to make sure that dict["AppleLocale"] is a valid (not nil) string, there are more than just one approach to follow for doing it, for instance you could do optional binding, like this:
let path = self.userDesktopDirectory + "/Library/Preferences/.GlobalPreferences.plist"
let dictRoot = NSDictionary(contentsOfFile: path)
if let dict = dictRoot{
if let appleLocale = dict["AppleLocale"] as? String {
print(appleLocale)
} else {
// `dict["AppleLocale"]` is nil OR contains not string value
}
}
Actually, I would assume that you don't have to deal with try for such a case.
I'm using Firebaseauth to manage users and data for my iOS app. The users can log in, and their userinfo is stored correct in the database.
But when I try to get the users to write to the database in a different viewController, using this string:
self.ref.child("users").child(user.uid).setValue(["username": username])
The thrown error is
Type user has no member .uid
That makes sense I guess, since I haven't created the variable. But I can't figure out how to declare it?
This is how you get the user's uid:
let userID = Auth.auth().currentUser!.uid
UPDATE: Since this answer is getting upvotes, make sure you prevent your app from crashing by using guards:
guard let userID = Auth.auth().currentUser?.uid else { return }
You might want to use a guard, as a force unwrap might break your app if a user isn’t signed in.
guard let userID = Auth.auth().currentUser?.uid else { return }
FIRAuth has actually been renamed to Auth. So, as per the latest changes, it will be
let userID = Auth.auth().currentUser!.uid
Edit.
As pointed out in comments, A force unwrap may crash the app.
guard let userID = Auth.auth().currentUser?.uid else { return }