Respond to CR.

Signal/src/ViewControllers/PhotoLibrary/ImagePickerController.swift

@@ -56,6 +56,7 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
                                                            target: self,
                                                            action: #selector(didPressCancel))
 
+        if #available(iOS 11, *) {
             titleLabel.text = photoCollection.localizedTitle()
             titleLabel.textColor = Theme.primaryColor
             titleLabel.font = UIFont.ows_dynamicTypeBody.ows_mediumWeight()
@@ -71,6 +72,9 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
             titleView.isUserInteractionEnabled = true
             titleView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(titleTapped)))
             navigationItem.titleView = titleView
+        } else {
+            navigationItem.title = photoCollection.localizedTitle()
+        }
 
         let featureFlag_isMultiselectEnabled = true
         if featureFlag_isMultiselectEnabled {
@@ -242,7 +246,11 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
         photoCollection = collection
         photoCollectionContents = photoCollection.contents()
 
+        if #available(iOS 11, *) {
             titleLabel.text = photoCollection.localizedTitle()
+        } else {
+            navigationItem.title = photoCollection.localizedTitle()
+        }
 
         collectionView?.reloadData()
     }

Signal/src/ViewControllers/PhotoLibrary/PhotoCollectionPickerController.swift

@@ -37,6 +37,7 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
     override func viewDidLoad() {
         super.viewDidLoad()
 
+        if #available(iOS 11, *) {
             let titleLabel = UILabel()
             titleLabel.text = previousPhotoCollection.localizedTitle()
             titleLabel.textColor = Theme.primaryColor
@@ -53,6 +54,9 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
             titleView.isUserInteractionEnabled = true
             titleView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(titleTapped)))
             navigationItem.titleView = titleView
+        } else {
+            navigationItem.title = previousPhotoCollection.localizedTitle()
+        }
 
         library.add(delegate: self)