You could maybe make a singleton class for managing Firebase methods. I do something similar whenever building apps with Firebase. This lets you reference values and use methods related to Firebase globally, across multiple classes. Before I adopted this method, I found myself rewriting the same code for uploading objects to firebase. A singleton will let you create reusable code, including storage of a "last key" set in this global class.
class FirebaseManager {
//You've probably seen something similar to this "shared" in other Apple frameworks
//Maybe URLSession.shared or FileManager.default or UserDefaults.standard or SKPaymentQueue.default() or UIApplication.shared
static var shared = FirebaseManager()
func createEvent(name: String, timeStamp: [String:String], uid: String) {
let postNameObject = [
"EventName": name,
"timestamp": timeStamp,
"userID": uid
] as [String:Any]
postName.setValue(postNameObject, withCompletionBlock: { error, ref in
if error == nil {
self.dismiss(animated: true, completion: nil)
} else {
//Do something
}
})
let childautoID = postName.key
//Whatever else you need to do in the function below here...
}
}
Usage:
class SomeViewController: UIViewController {
@IBOutlet var nameTextField: UITextField!
//Some code...
@IBAction func createEventButtonPressed(_ sender: Any) {
FirebaseManager.shared.createEvent(name: nameTextField.text, timeStamp: [".sv":"timestamp"], uid: Auth.auth().currentUser!.uid)
}
//Some more code...
}
Similarly, you could add a value called lastKey of type String in our FirebaseManager class. Note the variable we add to the top of our FirebaseManager class:
class FirebaseManager {
var lastKey: String!
static var shared = FirebaseManager()
func createEvent(name: String, timeStamp: [String:String], uid: String) {
let postNameObject = [
"EventName": name,
"timestamp": timeStamp,
"userID": uid
] as [String:Any]
postName.setValue(postNameObject, withCompletionBlock: { error, ref in
if error == nil {
self.dismiss(animated: true, completion: nil)
} else {
//Do something
}
})
let childautoID = postName.key
//Whatever else you need to do in the function below here...
}
}
Similarly, we can set this value in one view controller:
class ViewControllerA: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
FirebaseManager.shared.lastKey = "aBcDeFg9876543210"
}
}
And grab this value in another view controller that loads following the previous view controller:
class ViewControllerB: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print(FirebaseManager.shared.lastKey)
}
}
Prints: aBcDeFg9876543210
This is the beauty of the static keyword. You can learn more about creating singleton classes here: https://cocoacasts.com/what-is-a-singleton-and-how-to-create-one-in-swift
