I am attempting to access a certain data tag and show an alert if it is not null in the following remote notification:
[AnyHashable("google.c.sender.id"): ************, AnyHashable("google.c.fid"): asdfjkl1234556, AnyHashable("aps"): {
alert = {
body = "Shipment is no longer available and has been removed from the app.
title = "Shipment ****** no longer available";
};
},
AnyHashable("gcm.message_id"): 1234567891234567,
AnyHashable("google.c.a.e"): 1,
AnyHashable("shipmentMessage"): ****** is no longer available and has been removed form the app.]
AnyHashable("shipmentMessage"): ****** is no longer available and has been removed form the app is what I am trying to access. I believe my code should not be calling this null:
if UIApplication.shared.applicationState == .active{
print("ACTIVE< CHECK > SHIPMENT MESSAGE : : : : : : \(String(describing: userInfo["shipmentMessage"] as? [AnyHashable:Any]))")
guard let arrAPS = userInfo["aps"] as? [String: Any] else { return }
guard let arrAlert = arrAPS["alert"] as? [String:Any] else { return }
if (userInfo["shipmentMessage"] as? [AnyHashable:Any]) != nil {
print("***********NOT NULL***************")
let strTitle:String = arrAlert["title"] as? String ?? ""
let strBody:String = arrAlert["body"] as? String ?? ""
let alert = UIAlertController(title: strTitle, message: strBody, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default) { action in
print("OK Action")
})
self.window?.rootViewController?.present(alert, animated: true)
} else {
print("The shipmentMessage was null")
}
}
Is it the way I am iterating to the shipment message? Any help would be appreciated
Just replace AnyHashable to string like this (userInfo["shipmentMessage"] as? [String:Any])
or copy paste this below code -
if (userInfo["shipmentMessage"] as? [String:Any]) != nil {
print("***********NOT NULL***************")
let strTitle:String = arrAlert["title"] as? String ?? ""
let strBody:String = arrAlert["body"] as? String ?? ""
let alert = UIAlertController(title: strTitle, message: strBody, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Ok", style: .default) { action in
print("OK Action")
})
self.window?.rootViewController?.present(alert, animated: true)
} else {
print("The shipmentMessage was null")
}
Related
How can I get location, time, lng, lat, mag and depth data from this API in Swift?
https://api.hknsoft.com/earthquake/v1/last24hours?limit=500
//API
let url = URL(string: "https://api.hknsoft.com/earthquake/v1/last24hours?limit=500")
let session = URLSession.shared
let task = session.dataTask(with: url!) { data, response, error in
if error != nil {
let alert = UIAlertController(title: "Error!", message: error?.localizedDescription, preferredStyle: UIAlertController.Style.alert)
let okButton = UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil)
alert.addAction(okButton)
self.present(alert, animated: true, completion: nil)
} else {
if data != nil {
do {
let jsonResponse = try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as! Dictionary<String, Any>
DispatchQueue.main.async {
//print(jsonResponse)
if let result = jsonResponse["earthquakes"] as? [String : Any] {
if let location = result["location"] as? String {
print(location)
}
if let time = result["time"] as? String {
print(time)
}
if let mag = result["mag"] as? Double {
print(mag)
}
if let lat = result["lat"] as? Double {
print(lat)
}
if let lng = result["lng"] as? Double {
print(lng)
}
if let depth = result["depth"] as? Double {
print(depth)
}
}
}
} catch {
print("alert")
let alert = UIAlertController(title: "Error!", message: error.localizedDescription, preferredStyle: UIAlertController.Style.alert)
let okButton = UIAlertAction(title: "OK", style: UIAlertAction.Style.default, handler: nil)
alert.addAction(okButton)
self.present(alert, animated: true, completion: nil)
}
}
}
}
task.resume()
func teacherExists(teacherName: String) -> Bool
{
var dataBaseRef2: DatabaseReference!
dataBaseRef2 = Database.database().reference()
let teachersTableRef = dataBaseRef2.child("teachers")
self.teachersList.removeAll()
teachersTableRef.observeSingleEvent(of: DataEventType.value, with: { (snapshot) in
// teachersTableRef.observe(.value)
//{
// snapshot in
let teachersNamesDictionary = snapshot.value as? [String: Any] ?? [:]
for(key, _) in teachersNamesDictionary
{
if let teacherDict = teachersNamesDictionary[key] as? [String: Any]
{
if let teacher = Teacher(dictionary: teacherDict)
{
//print(teacher.teacher_name)
self.teachersList.append(teacher.teacher_name)
}
}
}
print(self.teachersList.count)
})
print("Outside \(self.teachersList)")
return false
}
Because Firebase APIs are all asynchronous. It would be bad for your app if they blocked your code path, because that could cause your app to hang indefinitely.
observeSingleEvent returns immediately, and the passed observer gets invoked some time later, whenever the data is finally ready. Execution continues on the next line, which prints to the console.
getting error upon calling teacherExists function
let OKAction = UIAlertAction(title: "OK", style: .default, handler:
{
(action: UIAlertAction!) ->Void in
let textfield = alert.textFields![0] as UITextField
newTeacherName = textfield.text!.uppercased()
if !(newTeacherName.isEmpty)
{
//checking if teacher already exists using function teacherExists
let exists = self.teacherExists(teacherName: newTeacherName, completion:
if exists == true //if duplicate teacher is found
{
let alert = UIAlertController(title: "Duplicate Teacher", message: "Teacher \(newTeacherName) has been added earlier", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
else
{
//add teacher to database here
let dict = ["teacher_name" : newTeacherName]
let newTeacher = Teacher(dictionary: dict)
let tableRef = self.dataBaseRef.child("teachers") //getting reference of node with name teachers
let recordRef = tableRef.childByAutoId() //creating a new record in teachers node
recordRef.setValue(newTeacher!.toDictionary())//adding data to new record in teachers node
}
}
})
You can use closure to callback after check for duplicate
func teacherExists(teacherName: String, completion: #escaping ((Bool) -> Void)) -> Void {
var dataBaseRef2: DatabaseReference!
dataBaseRef2 = Database.database().reference()
let teachersTableRef = dataBaseRef2.child("teachers")
self.teachersList.removeAll()
teachersTableRef.observeSingleEvent(of: DataEventType.value, with: { (snapshot) in
let teachersNamesDictionary = snapshot.value as? [String: Any] ?? [:]
for(key, _) in teachersNamesDictionary
{
if let teacherDict = teachersNamesDictionary[key] as? [String: Any]
{
if let teacher = Teacher(dictionary: teacherDict)
{
//print(teacher.teacher_name)
self.teachersList.append(teacher.teacher_name)
}
}
}
let exists = self.teachersList.contains(teacherName)
completion(exists)
})
}
And call function as below
teacherExists(teacherName: newTeacherName) { (exists) in
if exists {
// show alert
} else {
// add new teacher to db
}
}
Hope it help!
Everything was working fine, then I deleted some old messages and conversations from My Firebase Database. Now every time I send a message I get a crash. I deleted all old users and created new users and tried to send messages and I still keep getting a crash. I am not sure what can be causing this. Any suggestions will be helpful. It first happened after I tested out this function to delete the table cell...
func deleteConversation(_ conversation:Conversation) {
guard let user = Auth.auth().currentUser else { return }
let ref = Database.database().reference()
let obj = [
"conversations/users/\(user.uid)/\(conversation.partner_uid)/muted": true
] as [String:Any]
print("OBBJ: \(obj)")
ref.updateChildValues(obj, withCompletionBlock: { error, ref in
if error != nil {
let alert = UIAlertController(title: "Error deleting conversation!", message: nil, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Okay", style: .default, handler: nil))
} else {
let alert = UIAlertController(title: "Conversation deleted!", message: nil, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Okay", style: .default, handler: nil))
}
})
}
func downloadMessages() {
self.messages = []
downloadRef?.observe(.childAdded, with: { snapshot in
let dict = snapshot.value as! [String:AnyObject]
if let sender = dict["sender"] as! String!, let recipient = dict["recipient"] as! String!, let text = dict["text"] as! String!, text.characters.count > 0 {
let timestamp = dict["timestamp"] as! Double
let date = NSDate(timeIntervalSince1970: timestamp/1000)
let message = JSQMessage(senderId: sender, senderDisplayName: "", date: date as Date!, text: text)
self.messages.append(message!)
self.reloadMessagesView()
self.finishReceivingMessage(animated: true)
}
else if let id = dict["sender"] as! String!,
let photoURL = dict["imageUrl"] as! String!, photoURL.characters.count > 0 { // 1
// 2
if let mediaItem = JSQPhotoMediaItem(maskAsOutgoing: id == self.senderId) {
// 3
let timestamp = dict["timestamp"] as! Double
let date = NSDate(timeIntervalSince1970: timestamp/1000)
if let message = JSQMessage(senderId: id, senderDisplayName: "", date: date as Date!, media: mediaItem) {
self.messages.append(message)
if (mediaItem.image == nil) {
self.photoMessageMap[snapshot.key] = mediaItem
}
self.collectionView.reloadData()
}
if photoURL.hasPrefix("gs://") {
self.fetchImageDataAtURL(photoURL, forMediaItem: mediaItem, clearsPhotoMessageMapOnSuccessForKey: nil)
}
}
}
else {
print("Error! Could not decode message data")
}
})
// We can also use the observer method to listen for
// changes to existing messages.
// We use this to be notified when a photo has been stored
// to the Firebase Storage, so we can update the message data
updatedMessageRefHandle = downloadRef?.observe(.childChanged, with: { (snapshot) in
let key = snapshot.key
let messageData = snapshot.value as! Dictionary<String, String> // 1
if let photoURL = messageData["imageUrl"] as String! { // 2
// The photo has been updated.
if let mediaItem = self.photoMessageMap[key] { // 3
self.fetchImageDataAtURL(photoURL, forMediaItem: mediaItem, clearsPhotoMessageMapOnSuccessForKey: key) // 4
}
}
})
}
It's very likely the error is a result of force casting - as!
Instead of
let messageData = snapshot.value as! Dictionary<String, String>
do
guard let messageData = snapshot.value as? Dictionary<String, String> else { return }
Your snapshot.value is either nil, or is not an instance of Dictionary<String, String>, and force casting it to such will result in crash.
You should also read more about optionals and type casting in Swift, because you use ! a lot, and not once in your program is it used correctly.
So I am really new to threading and I've been reading up on it all day. For some reason though the data isn't loading before other code executes
Basically I need all the values that have a key ["whatever"] to be filled into an array, which works in other places because I don't need to load it first. So i have checked and double checked the keys that I am updating do exist and the keys I am extracting do exist maybe not the values yet but the keys do.
The problem is the code goes to fast to through the method. How would I make the main thread wait untill my firebase has loaded the data I have tried it below but it does not seem to be working
here is my code
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let alertController = UIAlertController(title: "Accept Bet", message: "Match the bet of " + amountBets[indexPath.row], preferredStyle: .alert)
let okButton = UIAlertAction(title: "No", style: .default, handler: { (action) -> Void in
print("Ok button tapped")
})
let yesButton = UIAlertAction(title: "Yes", style: .default, handler: { (action) -> Void in
// let them know to wait a second or the bet won't go through
var waitController = UIAlertController(title: "Please Wait", message: "You must wait for the bet to go through", preferredStyle: .alert)
self.present(waitController, animated: true, completion: nil)
//take away that bitches money
self.takeAwayMoney(self.amountBets[indexPath.row], completion: { (result: Bool?) in
guard let boolResult = result else {
return
}
if boolResult == true {
self.updateBet(indexPath.row, completion: {(result: String?) in
guard let resultRecieved = result else {
return
}
print(self.opposingUserNames)
//let delayInSeconds = 7.0 // 1
//DispatchQueue.main.asyncAfter(deadline: .now() + delayInSeconds) { // 2
self.dismiss(animated: true, completion: nil)
let successController = UIAlertController(title: "Success", message: "You have made a bet with " + self.opposingUserNames!, preferredStyle: .alert)
let okButt = UIAlertAction(title: "Ok", style: .default, handler: nil)
successController.addAction(okButt)
self.present(successController, animated: true, completion: nil)
//lastly delete the opposing UserName
print(self.opposingUserNames)
self.amountBets.remove(at: indexPath.row)
self.tableView.reloadData()
print("Second")
print(self.opposingUserNames)
//}
})
} else {
return
}
})
//then delete that cell and do another pop up that says successful
// check if value is yes or no in the database
})
alertController.addAction(okButton)
alertController.addAction(yesButton)
present(alertController, animated: true, completion: nil)
}
The below function updates the values OpposingUsername and show
func updateBet(_ index: Int, completion: #escaping (_ something: String?) -> Void) {
let userID = FIRAuth.auth()?.currentUser?.uid
datRef.child("User").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
// ...
self.datRef.child("Bets").observe(.childAdded, with: { snapshot in
//
// this is the unique identifier of the bet. eg, -Kfx81GvUxoHpmmMwJ9P
guard let dict = snapshot.value as? [String: AnyHashable] else {
print("failed to get dictionary from Bets.\(self.userName)")
return
}
let values = ["OpposingUsername": self.userName,"Show": "no"]
self.datRef.child("Bets").child(self.tieBetToUser[index]).updateChildValues(values)
// now get the opposing username which is just the Username registered to that specific bet
self.datRef.child("Bets").child(self.tieBetToUser[index]).observe(.childAdded, with: { snapshot in
guard let dict2 = snapshot.value as? [String: AnyHashable] else {
return
}
let userNameOfOtherPlayer = dict2["Username"] as? String
self.opposingUserNames = userNameOfOtherPlayer!
completion(self.opposingUserNames)
})
})
}) { (error) in
print(error.localizedDescription)
}
}
ok so with this updated code it cuts out the logic errors I had earlier, but now the app hangs on my waitAlertViewController. Not sure why. it does updated the bet in the firebase database so I know its working and running that code but its like never completing it all. sorry bibscy I see what you mean now
completion handlers are pretty powerful once you understand them better
//Notice that I made `result: String?` optional, it may or may not have a value.
func getOpoosingUserNames(_ username: String,_ index: Int, completion: #escaping (_ result: String?) -> Void ) {
let userID = FIRAuth.auth()?.currentUser?.uid
datRef.child("User").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
let username = value?["username"] as? String ?? ""
self.userName = username
// ...
self.datRef.child("Bets").observe(.childAdded, with: { snapshot in
//
// this is the unique identifier of the bet. eg, -Kfx81GvUxoHpmmMwJ9P
let betId = snapshot.key as String
guard let dict = snapshot.value as? [String: AnyHashable] else {
print("failed to get dictionary from Bets.\(self.userName)")
return
}
if let show = dict["Show"] as? String {
let opposingUser = dict["OpposingUsername"] as? String
self.opposingUserNames.append(opposingUser!)
}
completion(opposingUserNames)
})
}) { (error) in
print(error.localizedDescription)
}
}
//update the be
func updateBet(_ index: Int, completion: #escaping (_ something: [String]?) -> Void) {
let userID = FIRAuth.auth()?.currentUser?.uid
datRef.child("User").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
// Get user value
let value = snapshot.value as? NSDictionary
// ...
self.datRef.child("Bets").observe(.childAdded, with: { snapshot in
//
// this is the unique identifier of the bet. eg, -Kfx81GvUxoHpmmMwJ9P
guard let dict = snapshot.value as? [String: AnyHashable] else {
print("failed to get dictionary from Bets.\(self.userName)")
return
}
let values = ["OpposingUsername": self.userName,"Show": "no"]
//store the values received from Firebase in let valueOfUpdate and pass this
// constant to your completion handler completion(valueOfUpdate) so that you can use this value in func
//tableView(_ tableView:_, didSelectRowAt indexPath:_)
let valueOfUpdate = self.datRef.child("Bets").child(self.tieBetToUser[index]).updateChildValues(values)
completion(valueOfUpdate)
}) { (error) in
print(error.localizedDescription)
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let alertController = UIAlertController(title: "Accept Bet", message: "Match the bet of " + amountBets[indexPath.row], preferredStyle: .alert)
let okButton = UIAlertAction(title: "No", style: .default, handler: { (action) -> Void in
print("Ok button tapped")
})
let yesButton = UIAlertAction(title: "Yes", style: .default, handler: { (action) -> Void in
//take away that bitches money
self.takeAwayMoney(self.amountBets[indexPath.row])
//then delete that cell and do another pop up that says successful
// check if value is yes or no in the database
self.updateBet(indexPath.row, completion: {(result: String) in
guard let resultReceivedInupdateBet = result, else {
print("result of updateBet() is \(result)")
}
print("If you see this print, database was updated")
//calling this method with the indexPath.row clicked by the user
self.getOpoosingUserNames(self.userName, indexPath.row, completion: { (result: [String]) in
guard let resultReceivedIngetOpoosingUserNames = result{
print("result of getOpoosingUserNames is \(result)")
}
print("If you see this print, you received a value from db after calling getOpoosingUserNames and that value is in \(result) ")
//result is not nil, resultReceivedIngetOpoosingUserNames has the same value as result.
}//end of self.getOpoosingUserNames
self.checkForNo(indexPath.row)
self.amountBets.remove(at: indexPath.row)
self.tableView.reloadData()
print(self.opposingUserNames)
let successController = UIAlertController(title: "Success", message: "You have made a bet with " + self.opposingUserNames[indexPath.row], preferredStyle: .alert)
let okButt = UIAlertAction(title: "Ok", style: .default, handler: nil)
successController.addAction(okButt)
self.present(successController, animated: true, completion: nil)
//lastly delete the opposing UserName
self.opposingUserNames.remove(at: indexPath.row)
})
alertController.addAction(okButton)
alertController.addAction(yesButton)
present(alertController, animated: true, completion: nil)
}
I am trying to pass a users' email address to another ViewController via a delegate when the user has successfully logged in.
The snippet of code in question (marked *) works fine where it is and the data is passed successfully. However, at this point the user has not successfully logged in, therefore I would rather insert the snippet where the /**** is, a little further down.
However it does work when in that position. Why is that? (I am new to Swift)
Thanks
#IBAction func loginButtonTapped(_ sender: AnyObject)
{
let userEmail = userEmailTextField.text;
let userPassword = userPasswordTextField.text;
if (userPassword!.isEmpty || userEmail!.isEmpty) { return; }
// send user data to server side
let myUrl = URL(string: "http://www.quasisquest.uk/KeepScore/userLogin.php");
var request = URLRequest(url:myUrl!);
request.httpMethod = "POST";
let postString = "email=\(userEmail!)&password=\(userPassword!)";
request.httpBody = postString.data(using: String.Encoding.utf8);
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
DispatchQueue.main.async
{
// spinningActivity!.hide(true)
if(error != nil)
{
//Display an alert message
let myAlert = UIAlertController(title: "Alert", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler:nil)
myAlert.addAction(okAction);
self.present(myAlert, animated: true, completion: nil)
return
}
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]
*if self.delegate != nil {
self.delegate?.userLoggedIn(data: userEmail! )
}
// retrieve login details and check to see if all ok
if let parseJSON = json {
let returnValue = parseJSON["status"] as? String
if(returnValue != "error")
{
/**** if self.delegate != nil {
self.delegate?.userLoggedIn(data: userEmail! )
} ****/
UserDefaults.set(UserDefaults.standard)(true, forKey: "isUserLoggedIn");
let mainPage = self.storyboard?.instantiateViewController(withIdentifier: "ViewController")
let mainPageNav = UINavigationController(rootViewController: mainPage!)
let appDelegate = UIApplication.shared.delegate
appDelegate?.window??.rootViewController = mainPageNav
self.dismiss(animated: true, completion: nil)
} else {
// display an alert message
let userMessage = parseJSON["message"] as? String
let myAlert = UIAlertController(title: "Alert", message: userMessage, preferredStyle: UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler:nil)
myAlert.addAction(okAction);
self.present(myAlert, animated: true, completion: nil)
}
}
} catch
{
print(error)
}
}
}