不要将所有文本字段更新为 firebase

Question

I have three textFields and when the user enters information into them, the information is sent to Firebase .

     func buttonMethod() { 
if let uid = FIRAuth.auth()?.currentUser?.uid{
            if let City = City.text{
                if let Major = Major.text{
                    if let College = College.text{

                        let saveObject: Dictionary<String, Any> = [
                            "uid": uid,
                            "City" : City,
                            "Major" : Major,
                            "College" : College
                        ]
                   }
               }
          }
      }



FIRDatabase.database().reference().child("info").child(self.loggedInUser!.uid).setValue(saveObject)

Using those same textFields , the user can edit their information. And the information will be displayed in labels in another view controller.

  func loadInfo(){
        if (FIRAuth.auth()?.currentUser) != nil{

            FIRDatabase.database().reference().child("info").child(self.loggedInUser!.uid).observeSingleEvent(of: .value, with: { (snapshot:FIRDataSnapshot) in


                if let postsDictionary = snapshot .value as? [String: AnyObject] {
                    for post in postsDictionary {
                        //self.posts.add(post.value)

                        let city = postsDictionary["City"] as! String
                        let major = postsDictionary["Major"] as! String
                        let college = postsDictionary["College"] as! String
                        self.City.text = city
                        self.Major.text = major
                        self.College.text = college
                    }

                }})}
    }

My problem is that when the user edits the information, if a textField was not edited it replaces the value of the non-edited textField in Firebase with an empty string. I want it to be that if the user does not edit a textField then the value in Firebase should stay the same.I started out with this:

 if City.tex t== "" {

 }
 if Major.text=="" {

 }
 if College.text==""{

 }

But I'm not sure where to go from there.

Answer 1

If the textfield text is empty then don't send that field to firebase. Say if user haven't edited city field then don't add city textField in the method to send value to firebase.

Please try update your buttonMethod() like this,

func buttonMethod() {
    if let uid = FIRAuth.auth()?.currentUser?.uid{

        var tempObject = [String:Any]()
        tempObject["uid"] = uid
        if !City.text.isEmpty {
            tempObject["City"] = City.text
        }

        if !Major.text.isEmpty{
            tempObject["Major"] = Major.text
        }

        if !College.text.isEmpty{
            tempObject["College"] = College.text
        }

        let saveObject:Dictionary<String,Any> = tempObject

}

Instead of saving the object to firebase update the data at firebase using updateChildValues() function

Answer 2

I think there is another solution: you could show the original values/information on your text fields instead of leaving them blank. So try to remove the textfields in your code with the following structure:

import Foundation
import SwiftUI

struct TextFieldWithDefaultValue: View {

    var model:userModel    // Replace it with your own view model
    var textFieldName: String
    @State var editedValue: String

    init(model: userModel, text: String) {
        self.model = model
        self.textFieldName = text
        switch self.textFieldName {
        case "Name": self._editedValue = State(wrappedValue: model.getName())
        case "Bio": self._editedValue = State(wrappedValue: model.getBio())
        case "Interest": self._editedValue = State(wrappedValue: model.getInterest())
        default:
            self._editedValue = State(wrappedValue: "No records")
        }
    }
    
    var body: some View {
        TextField(textFieldName, text: $editedValue)
    }

}