MAFStoryBoardHandlerType.

MAFStoryBoardHandlerType.swift

//
//  MAFStoryBoardHandlerType.swift
//  MAFFinance
//
//  Created by Miguel Fermin on 10/20/15.
//  Copyright © 2015 MAF Software LLC. All rights reserved.
//

import UIKit

protocol MAFStoryBoardHandlerType {
    typealias StoryBoardIdentifier: RawRepresentable
}

extension MAFStoryBoardHandlerType where Self: UIViewController, StoryBoardIdentifier.RawValue == String {
    /// Instantiates and returns the view controller with the specified identifier.
    /// - parameter identifier: An identifier StoryBoardIdentifier enum type that uniquely identifies the view controller in the storyboard file.
    /// - returns: The view controller corresponding to the specified identifier, StoryBoardIdentifier enum type.
    func instantiateViewControllerWithIdentifier(identifier: StoryBoardIdentifier) -> UIViewController {
        guard let storyboard = self.storyboard
            else { fatalError("Unable to instantiate view controller with identifier \(identifier.rawValue) from Storyboard.") }
        return storyboard.instantiateViewControllerWithIdentifier(identifier.rawValue)
    }
    
    /// Instantiates and returns the navigation controller with the specified identifier.
    /// - parameter identifier: An identifier StoryBoardIdentifier enum type that uniquely identifies the navigation controller in the storyboard file.
    /// - returns: The navigation controller corresponding to the specified identifier, StoryBoardIdentifier enum type.
    /// - note: If the identifier doesn't correspond to a UINavigationController, this method returns nil.
    func instantiateNavigationControllerWithIdentifier(identifier: StoryBoardIdentifier) -> UINavigationController? {
        return self.instantiateViewControllerWithIdentifier(identifier) as? UINavigationController
    }
}


/* How to use it */

// Your view controller must conform to the protocol
class MAFViewController: MAFDetailViewController, MAFStoryBoardHandlerType 

// Then you must implement the "StoryBoardIdentifier" enum
enum StoryBoardIdentifier: String {
    case InAppPurchasePage = "MAFIAPurchasePageStoryboardID"
}

// Then you can use it as follows
if let viewController = instantiateViewControllerWithIdentifier(.InAppPurchasePage) as? InAppPurchaseViewController {
    // Use viewController
}