From 0d0b6b8fa618f280719a2c550db327958df8f188 Mon Sep 17 00:00:00 2001
From: Kiel Gillard <kgillard@deputy.com>
Date: Thu, 16 Jan 2020 09:56:51 +1100
Subject: [PATCH] Gives iOS a chance to open universal links. #1625

---
 iOS/Article/WebViewController.swift | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/iOS/Article/WebViewController.swift b/iOS/Article/WebViewController.swift
index 1597bbd5a..47cca7e1f 100644
--- a/iOS/Article/WebViewController.swift
+++ b/iOS/Article/WebViewController.swift
@@ -354,9 +354,17 @@ extension WebViewController: WKNavigationDelegate {
 			
 			let components = URLComponents(url: url, resolvingAgainstBaseURL: false)
 			if components?.scheme == "http" || components?.scheme == "https" {
-				let vc = SFSafariViewController(url: url)
-				present(vc, animated: true)
 				decisionHandler(.cancel)
+				
+				// If the resource cannot be opened with an installed app, present the web view.
+				UIApplication.shared.open(url, options: [.universalLinksOnly: true]) { didOpen in
+					assert(Thread.isMainThread)
+					guard didOpen == false else {
+						return
+					}
+					let vc = SFSafariViewController(url: url)
+					self.present(vc, animated: true)
+				}
 			} else {
 				decisionHandler(.allow)
 			}