Write to Plist in Swift - ios

Question

I am trying to write to a plist in xcode. What I've written works, except the plist file doesn't change. I've tried a few different implementations of this, and reaching the same result.
Here is the code:
func saveGameData() {
let BedroomFloorKey = "BedroomFloor"
let BedroomWallKey = "BedroomWall"
var bedroomFloorID: AnyObject = 101 as AnyObject
var bedroomWallID: AnyObject = 101 as AnyObject
let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true) as NSArray
let documentsDirectory = paths.object(at: 0) as! NSString
let path = documentsDirectory.appendingPathComponent("room.plist")
print("PATH", path)
let dict: NSMutableDictionary = ["XInitializerItem": "DoNotEverChangeMe"]
//saving values
dict.setObject(bedroomFloorID, forKey: BedroomFloorKey as NSCopying)
dict.setObject(bedroomWallID, forKey: BedroomWallKey as NSCopying)
//...
//writing to GameData.plist
dict.write(toFile: path, atomically: false)
let resultDictionary = NSMutableDictionary(contentsOfFile: path)
print("Saved GameData.plist file is --> \(resultDictionary?.description ?? "")")
}
My plist is in the main directory of my xcode project, same folder as were the ViewController is.
Thanks

Answer 1

You cannot write into the application bundle, for obvious reasons the bundle is read-only.
Your code writes the plist into the Documents directory in the container of the application. If you have a default Property List file in the application bundle copy it on the first launch of the app into the Documents directory.
However the code looks like a ugly literal translation of Objective-C code. This is a native Swift version
func saveGameData() throws {
let bedroomFloorKey = "BedroomFloor"
let bedroomWallKey = "BedroomWall"
let bedroomFloorID = 101
let bedroomWallID = 101
let documentsDirectory = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
let url = documentsDirectory.appendingPathComponent("room.plist")
print("PATH", url)
var dict : [String:Any] = ["XInitializerItem": "DoNotEverChangeMe"]
//saving values
dict[bedroomFloorKey] = bedroomFloorID
dict[bedroomWallKey] = bedroomWallID
//...
//writing to GameData.plist
let data = try PropertyListSerialization.data(fromPropertyList: dict, format: .xml, options: 0)
try data.write(to: url)
print("Saved GameData.plist file is --> \(dict)")
}
There is no need to reread the data. If no error is thrown the plist has been written successfully.

Answer 2

You create a plist file inside documents
let path = documentsDirectory.appendingPathComponent("room.plist")
which isn't same as the file located in your main bundle ( same level as ViewController.swift ) which won't accept any write as bundle is signed with the app and can't accept any change