Helper methods for storing data in UserDefaults using PKDataManager class

PKDataManager.swift

class PKDataManager {
    
    static let defaults = UserDefaults.standard
    
  // check if 'key' is present in user defaults
    static func isKeyPresentInUserDefaults(key: String) -> Bool {
        return defaults.object(forKey: key) != nil
    }
    
   // store the SETs as string for given 'key' in user defaults
    static func set(_ values: Set<String>, forKey key: String) {
        
        let encodedData = NSKeyedArchiver.archivedData(withRootObject: values)
        defaults.set(encodedData, forKey: key)
        synchronize()
    }
    
    // retrieve the SETs values from user defaults
    static func get(forKey key: String) -> Set<String>{
        
        if isKeyPresentInUserDefaults(key: key) {
            
            let decoded = defaults.value(forKey: key)
            let decodedTeams = NSKeyedUnarchiver.unarchiveObject(with: decoded as! Data )
            return (decodedTeams as? Set<String>)!
        }
        else {
            print("Key \(key) is not found")
        }
        return []
    }
    
  // clear 'ALL' the values for the given key
    static func clearAll(forKey key: String) {
        if isKeyPresentInUserDefaults(key: key) {
            defaults.removeObject(forKey: key)
            synchronize()
        }
    }
    
    static func synchronize() {
        defaults.synchronize()
    }
    
    
    // remove the SETs as string value for given 'key' in user defaults
    static func remove(_ value: String, forKey key: String) {
        var items = self.get(forKey: key)
        items.remove(value)
        
        clearAll(forKey: key)
        
        set(items, forKey: key)
        
        synchronize()
    }
    
}