AdaptiveCode/AdaptiveCode/UIViewController+PhotoContents.swift
/* |
Copyright (C) 2016 Apple Inc. All Rights Reserved. |
See LICENSE.txt for this sample’s licensing information |
Abstract: |
An extension that returns information about photos contained in view controllers. |
*/ |
import UIKit |
/* |
This extension is specific to this application. Some of the specific view |
controllers in the app override these to return the values that make sense for |
them. |
*/ |
extension UIViewController { |
/* |
Returns the photo currently being displayed by the receiver, or `nil` if the |
receiver is not displaying a photo. |
*/ |
func containedPhoto() -> Photo? { |
// By default, view controllers don't contain photos. |
return nil |
} |
func containsPhoto(_ photo: Photo) -> Bool { |
// By default, view controllers don't contain photos. |
return false |
} |
func currentVisibleDetailPhotoWithSender(_ sender: AnyObject?) -> Photo? { |
// Look for a view controller that has a visible photo. |
if let target = targetViewController(forAction: #selector(UIViewController.currentVisibleDetailPhotoWithSender(_:)), sender: sender) { |
return target.currentVisibleDetailPhotoWithSender(sender) |
} |
else { |
return nil |
} |
} |
} |
extension UISplitViewController { |
override func currentVisibleDetailPhotoWithSender(_ sender: AnyObject?) -> Photo? { |
if isCollapsed { |
// If we're collapsed, we don't have a detail. |
return nil |
} |
else { |
// Otherwise, return our detail controller's contained photo (if any). |
let controller = viewControllers.last |
return controller?.containedPhoto() |
} |
} |
} |
Copyright © 2016 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2016-09-13