From 78251e9a50de98972d51e2b0c23ff72d3b1b4876 Mon Sep 17 00:00:00 2001
From: Roopesh Chander <roop@roopc.net>
Date: Sat, 13 Oct 2018 16:02:42 +0530
Subject: [PATCH] Configure the split-view controller to work in both iPhone
 and iPad

Signed-off-by: Roopesh Chander <roop@roopc.net>
---
 .../WireGuard/UI/iOS/MainViewController.swift | 24 +++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/WireGuard/WireGuard/UI/iOS/MainViewController.swift b/WireGuard/WireGuard/UI/iOS/MainViewController.swift
index 25be277..e477f21 100644
--- a/WireGuard/WireGuard/UI/iOS/MainViewController.swift
+++ b/WireGuard/WireGuard/UI/iOS/MainViewController.swift
@@ -20,4 +20,28 @@ class MainViewController: UISplitViewController {
 
         super.loadView()
     }
+
+    override func viewDidLoad() {
+        self.delegate = self
+
+        // On iPad, always show both masterVC and detailVC, even in portrait mode, like the Settings app
+        self.preferredDisplayMode = .allVisible
+    }
+}
+
+extension MainViewController: UISplitViewControllerDelegate {
+    func splitViewController(_ splitViewController: UISplitViewController,
+                             collapseSecondary secondaryViewController: UIViewController,
+                             onto primaryViewController: UIViewController) -> Bool {
+        // On iPhone, if the secondaryVC (detailVC) is just a UIViewController, it indicates that it's empty,
+        // so just show the primaryVC (masterVC).
+        let detailVC = (secondaryViewController as? UINavigationController)?.viewControllers.first
+        let isDetailVCEmpty: Bool
+        if let detailVC = detailVC {
+            isDetailVCEmpty = (type(of: detailVC) == UIViewController.self)
+        } else {
+            isDetailVCEmpty = true
+        }
+        return isDetailVCEmpty
+    }
 }