UserDefaults

UserDefaults.swift

// UserDefaults.swift
//
// Copyright (c) 2015 muukii
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import UIKit

class UserDefaults: NSObject {
    private class func generateKey(#baseKey: String) -> String {
        return "\(NSStringFromClass(self))_\(baseKey)"
    }
    
    class func saveToDisk(#value: AnyObject?,key: String = __FUNCTION__) {
        let key = self.generateKey(baseKey: key)
        let userDefaults = NSUserDefaults.standardUserDefaults()
        userDefaults.setObject(value, forKey: key)
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), { () -> Void in
            userDefaults.synchronize()
            return
        })
    }
    
    class func loadFromDisk<T>(key: String = __FUNCTION__) -> T? {
        let key = self.generateKey(baseKey: key)
        let userDefaults = NSUserDefaults.standardUserDefaults()
        return userDefaults.objectForKey(key) as? T
    }
    
    class func purgeFromDisk(key: String = __FUNCTION__) {
        let key = self.generateKey(baseKey: key)
        let userDefaults = NSUserDefaults.standardUserDefaults()
        userDefaults.removeObjectForKey(key)
    }
/*    
    class var accessToken: String? {
        get {
            return self.loadFromDisk()
        }
        set {
            self.saveToDisk(value: newValue)
        }
    }
*/
}