Index: iOS/SelectKeyFileController.swift
==================================================================
--- iOS/SelectKeyFileController.swift
+++ iOS/SelectKeyFileController.swift
@@ -64,11 +64,11 @@
         }
 
         httpServerThread.start()
     }
 
-    deinit {
+    override func viewDidDisappear(_ animated: Bool) {
         httpServerThread.runLoop.stop()
         httpServerThread.join()
     }
 
     override func tableView(_ tableView: UITableView,