Example usage of saving GameData

Swift3SaveUsage.swift

/// User clicks on slot one, so we want to create a new save file for that slot
if GameData.sharedInstance.loadGame(saveFile: "One") {
  /// An existing save file was there, progress as you need to
}
else {
  /// A new save file was created, so start your game from a fresh state
}

/// User buys 100 gold
GameData.sharedInstance.bank += 100
GameData.sharedInstance.save()

/// User advances to level 2, so you want to update level data and save the file
/// Assumes you have handle on Level object already
level.completed = true
/// Then, I just replace the entire instance of the storage with the new level object.
/// More important when working with structs
GameData.sharedInstance.levelData?.levels[level.id] = level
/// Call save to write the changes out
GameData.sharedInstance.save()