Swift - Save Dictionary into a plist - ios

Question

I am trying to save/update a dictionary inside a plist file. If a try to save a single value into a plist I have no problem calling the dictionary as a NSMutableDictionary however, if I want to add another dictionary inside it I cannot achieve it.
For example I want to add a dictionary inside the plist with dictionary "dict2" below called "level2" having values as "value1", "value2", "value3" I cannot Achieve this.
Is there a way I can do this?
struct MyProgress {
//1
enum PlistError: ErrorType {
case FileNotWritten
case FileDoesNotExist
}
//2
let name:String
//3
var sourcePath:String? {
guard let path = NSBundle.mainBundle().pathForResource(name, ofType: "plist") else { return .None }
return path
}
//4
var destPath:String? {
guard sourcePath != .None else { return .None }
let dir = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
return (dir as NSString).stringByAppendingPathComponent("\(name).plist")
}
init?(name:String) {
//1
self.name = name
//2
let fileManager = NSFileManager.defaultManager()
//3
guard let source = sourcePath else { return nil }
guard let destination = destPath else { return nil }
guard fileManager.fileExistsAtPath(source) else { return nil }
//4
if !fileManager.fileExistsAtPath(destination) {
//5
do {
try fileManager.copyItemAtPath(source, toPath: destination)
} catch let error as NSError {
print("Unable to copy file. ERROR: \(error.localizedDescription)")
return nil
}
}
}
//1
func getValuesInPlistFile() -> NSDictionary?{
let fileManager = NSFileManager.defaultManager()
if fileManager.fileExistsAtPath(destPath!) {
guard let dict = NSDictionary(contentsOfFile: destPath!) else { return .None }
return dict
} else {
return .None
}
}
//2
func getMutablePlistFile() -> NSMutableDictionary?{
let fileManager = NSFileManager.defaultManager()
if fileManager.fileExistsAtPath(destPath!) {
guard let dict = NSMutableDictionary(contentsOfFile: destPath!) else { return .None }
return dict
} else {
return .None
}
}
//3
func addValuesToPlistFile(dictionary:NSDictionary) throws {
let fileManager = NSFileManager.defaultManager()
if fileManager.fileExistsAtPath(destPath!) {
if !dictionary.writeToFile(destPath!, atomically: false) {
print("File not written successfully")
throw PlistError.FileNotWritten
}
} else {
throw PlistError.FileDoesNotExist
}
}
}
class ProgressFunctions {
static func saveProgressData (plistName: String, dictName:String, dataName:String, dataValue: AnyObject) {
if let myProgressPlist = MyProgress(name: plistName) {
let dict = myProgressPlist.getMutablePlistFile()!
//let savingDict = dict[dictName]![dataName]!
//dict[dictName] = dataValue
print(dict)
do {
try myProgressPlist.addValuesToPlistFile(dict)
} catch {
print(error)
}
}
}
}