Ensure inputAccessory doesn't obscure the SN alert

This affects iOS 8, 9, and to a lesser degree iOS10.
On iOS11, presenting an alert causes the keyboard/inputAccessoryView to
temporarily dismiss.

// FREEBIE

Signal/src/ViewControllers/ConversationView/ConversationViewController.m

@@ -1356,9 +1356,28 @@ typedef NS_ENUM(NSInteger, MessagesRangeSizeMode) {
                                                          completion:(void (^)(BOOL didConfirmIdentity))completionHandler
 {
     return [SafetyNumberConfirmationAlert presentAlertIfNecessaryWithRecipientIds:self.thread.recipientIdentifiers
-                                                                 confirmationText:confirmationText
-                                                                  contactsManager:self.contactsManager
-                                                                       completion:completionHandler];
+        confirmationText:confirmationText
+        contactsManager:self.contactsManager
+        completion:^(BOOL didShowAlert) {
+            // Pre iOS-11, the keyboard and inputAccessoryView will obscure the alert if the keyboard is up when the
+            // alert is presented, so after hiding it, we regain first responder here.
+            if (@available(iOS 11.0, *)) {
+                // do nothing
+            } else {
+                [self becomeFirstResponder];
+            }
+            completionHandler(didShowAlert);
+        }
+        beforePresentationHandler:^(void) {
+            if (@available(iOS 11.0, *)) {
+                // do nothing
+            } else {
+                // Pre iOS-11, the keyboard and inputAccessoryView will obscure the alert if the keyboard is up when the
+                // alert is presented.
+                [self dismissKeyBoard];
+                [self resignFirstResponder];
+            }
+        }];
 }
 
 - (void)showFingerprintWithRecipientId:(NSString *)recipientId

Signal/src/ViewControllers/SafetyNumberConfirmationAlert.swift

@@ -18,13 +18,22 @@ class SafetyNumberConfirmationAlert: NSObject {
     }
 
     public class func presentAlertIfNecessary(recipientId: String, confirmationText: String, contactsManager: OWSContactsManager, completion: @escaping (Bool) -> Void) -> Bool {
-        return self.presentAlertIfNecessary(recipientIds: [recipientId], confirmationText: confirmationText, contactsManager: contactsManager, completion: completion)
+        return self.presentAlertIfNecessary(recipientIds: [recipientId], confirmationText: confirmationText, contactsManager: contactsManager, completion: completion, beforePresentationHandler: nil)
+    }
+
+    public class func presentAlertIfNecessary(recipientId: String, confirmationText: String, contactsManager: OWSContactsManager, completion: @escaping (Bool) -> Void, beforePresentationHandler: (() -> Void)? = nil) -> Bool {
+        return self.presentAlertIfNecessary(recipientIds: [recipientId], confirmationText: confirmationText, contactsManager: contactsManager, completion: completion, beforePresentationHandler: beforePresentationHandler)
     }
 
     public class func presentAlertIfNecessary(recipientIds: [String], confirmationText: String, contactsManager: OWSContactsManager, completion: @escaping (Bool) -> Void) -> Bool {
+        return self.presentAlertIfNecessary(recipientIds: recipientIds, confirmationText: confirmationText, contactsManager: contactsManager, completion: completion, beforePresentationHandler: nil)
+    }
+
+    public class func presentAlertIfNecessary(recipientIds: [String], confirmationText: String, contactsManager: OWSContactsManager, completion: @escaping (Bool) -> Void, beforePresentationHandler: (() -> Void)? = nil) -> Bool {
         return SafetyNumberConfirmationAlert(contactsManager: contactsManager).presentIfNecessary(recipientIds: recipientIds,
                                                                                                   confirmationText: confirmationText,
-                                                                                                  completion: completion)
+                                                                                                  completion: completion,
+                                                                                                  beforePresentationHandler: beforePresentationHandler)
     }
 
     /**
@@ -33,7 +42,7 @@ class SafetyNumberConfirmationAlert: NSObject {
      * @returns true  if an alert was shown
      *          false if there were no unconfirmed identities
      */
-    public func presentIfNecessary(recipientIds: [String], confirmationText: String, completion: @escaping (Bool) -> Void) -> Bool {
+    public func presentIfNecessary(recipientIds: [String], confirmationText: String, completion: @escaping (Bool) -> Void, beforePresentationHandler: (() -> Void)? = nil) -> Bool {
 
         guard let untrustedIdentity = untrustedIdentityForSending(recipientIds: recipientIds) else {
             // No identities to confirm, no alert to present.
@@ -75,7 +84,15 @@ class SafetyNumberConfirmationAlert: NSObject {
         }
         actionSheetController.addAction(showSafetyNumberAction)
 
-        actionSheetController.addAction(OWSAlerts.cancelAction)
+        // We can't use the default `OWSAlerts.cancelAction` because we need to specify that the completion
+        // handler is called.
+        let cancelAction = UIAlertAction(title: CommonStrings.cancelButton, style: .cancel) { _ in
+            Logger.info("\(self.logTag) user canceled.")
+            completion(false)
+        }
+        actionSheetController.addAction(cancelAction)
+
+        beforePresentationHandler?()
 
         UIApplication.shared.frontmostViewController?.present(actionSheetController, animated: true)
         return true

Signal/src/call/OutboundCallInitiator.swift

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 import Foundation
@@ -55,11 +55,12 @@ import SignalMessaging
 
         let showedAlert = SafetyNumberConfirmationAlert.presentAlertIfNecessary(recipientId: recipientId,
                                                                                 confirmationText: CallStrings.confirmAndCallButtonTitle,
-                                                                                contactsManager: self.contactsManager) { didConfirmIdentity in
+                                                                                contactsManager: self.contactsManager,
+                                                                                completion: { didConfirmIdentity in
                                                                                     if didConfirmIdentity {
                                                                                         _ = self.initiateCall(recipientId: recipientId)
                                                                                     }
-        }
+        })
         guard !showedAlert else {
             return false
         }