Ignore hardware mute switch during video playback in attachment approval view.

// FREEBIE

Signal/src/Signal-Bridging-Header.h

@@ -26,6 +26,7 @@
 #import "UIFont+OWS.h"
 #import "UIUtil.h"
 #import "UIView+OWS.h"
+#import "ViewControllerUtils.h"
 #import <JSQSystemSoundPlayer.h>
 #import <PureLayout/PureLayout.h>
 #import <SignalServiceKit/Contact.h>

Signal/src/ViewControllers/AttachmentApprovalViewController.swift

@@ -43,14 +43,26 @@ class AttachmentApprovalViewController: UIViewController {
         view.backgroundColor = UIColor.black
 
         self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem:.stop,
-            target:self,
-            action:#selector(donePressed))
+                                                                target:self,
+                                                                action:#selector(donePressed))
         self.navigationItem.title = NSLocalizedString("ATTACHMENT_APPROVAL_DIALOG_TITLE",
                                                       comment: "Title for the 'attachment approval' dialog.")
 
         createViews()
     }
 
+    override func viewWillAppear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+
+        ViewControllerUtils.setAudioIgnoresHardwareMuteSwitch(true)
+    }
+
+    override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+
+        ViewControllerUtils.setAudioIgnoresHardwareMuteSwitch(false)
+    }
+
     // MARK: - Create Views
 
     private func createViews() {