LocalStorage is an abstraction over the UserDefaults. The class is written in Swift 3

LocalStorage.swift

// Copyright © 2017 Kalpesh Talkar. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//  For support: https://gist.github.com/KalpeshTalkar/4c935471e81cd94b0468cb248a515951
//

/// LocalStorage is an abstraction over the UserDefaults.
/// - Save data locally
/// - Get local saved data
/// - Get local saved data in preferred data type
class LocalStorage {


    /// Save data locally
    ///
    /// - Parameters:
    ///   - value: data to be stored
    ///   - key: key
    class func set(value: Any, for key: String) {
        UserDefaults.standard.set(value, forKey: key)
    }


    /// Get locally saved data if exists
    ///
    /// - Parameter key: key against which the data is stored
    /// - Returns: data stored against the key, nil of no data present
    class func get(for key: String) -> Any? {
        return UserDefaults.value(forKey: key)
    }


    /// Get locally saved data with specific data type if exists
    ///
    /// - Parameters:
    ///   - key: key against which the data is stored
    ///   - type: data type of the data
    /// - Returns: data with the specified data type or nil of no data present/invalid data type
    class func get<T>(for key: String, of type: T.Type) -> T? {
        return UserDefaults.value(forKey: key) as? T
    }

}