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53 lines
1.9 KiB
53 lines
1.9 KiB
/*********************************************
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*
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* This code is under the MIT License (MIT)
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*
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* Copyright (c) 2016 AliSoftware
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*
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*********************************************/
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import UIKit
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// MARK: Protocol Definition
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/// Make your UIViewController subclasses conform to this protocol when:
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/// * they *are* Storyboard-based, and
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/// * this ViewController is not the initialViewController of your Storyboard, but a different scene
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///
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/// to be able to instantiate them from the Storyboard in a type-safe manner.
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///
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/// You need to implement `sceneStoryboard` yourself to indicate the UIStoryboard this scene is from.
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public protocol StoryboardSceneBased: class {
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/// The UIStoryboard to use when we want to instantiate this ViewController
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static var sceneStoryboard: UIStoryboard { get }
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/// The scene identifier to use when we want to instantiate this ViewController from its associated Storyboard
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static var sceneIdentifier: String { get }
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}
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// MARK: Default Implementation
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public extension StoryboardSceneBased {
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/// By default, use the `sceneIdentifier` with the same name as the class
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static var sceneIdentifier: String {
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return String(describing: self)
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}
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}
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// MARK: Support for instantiation from Storyboard
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public extension StoryboardSceneBased where Self: UIViewController {
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/**
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Create an instance of the ViewController from its associated Storyboard and the
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Scene with identifier `sceneIdentifier`
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- returns: instance of the conforming ViewController
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*/
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static func instantiate() -> Self {
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let storyboard = Self.sceneStoryboard
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let viewController = storyboard.instantiateViewController(withIdentifier: self.sceneIdentifier)
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guard let typedViewController = viewController as? Self else {
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fatalError("The viewController '\(self.sceneIdentifier)' of '\(storyboard)' is not of class '\(self)'")
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}
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return typedViewController
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}
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}
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