Respond to CR.

Signal/src/ViewControllers/PhotoLibrary/ImagePickerController.swift

@@ -254,7 +254,7 @@ class ImagePickerGridController: UICollectionViewController, PhotoLibraryDelegat
             return
         }
         let view = PhotoCollectionPickerController(library: library,
-                                                   lastPhotoCollection: photoCollection,
+                                                   previousPhotoCollection: photoCollection,
                                                    collectionDelegate: self)
         let nav = UINavigationController(rootViewController: view)
         self.present(nav, animated: true, completion: nil)

Signal/src/ViewControllers/PhotoLibrary/PhotoCollectionPickerController.swift

@@ -15,14 +15,14 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
     private weak var collectionDelegate: PhotoCollectionPickerDelegate?
 
     private let library: PhotoLibrary
-    private let lastPhotoCollection: PhotoCollection
-    private var photoCollections: PhotoCollections
+    private let previousPhotoCollection: PhotoCollection
+    private var photoCollections: [PhotoCollection]
 
     required init(library: PhotoLibrary,
-                  lastPhotoCollection: PhotoCollection,
+                  previousPhotoCollection: PhotoCollection,
                   collectionDelegate: PhotoCollectionPickerDelegate) {
         self.library = library
-        self.lastPhotoCollection = lastPhotoCollection
+        self.previousPhotoCollection = previousPhotoCollection
         self.photoCollections = library.allPhotoCollections()
         self.collectionDelegate = collectionDelegate
         super.init()
@@ -38,7 +38,7 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
         super.viewDidLoad()
 
         let titleLabel = UILabel()
-        titleLabel.text = lastPhotoCollection.localizedTitle()
+        titleLabel.text = previousPhotoCollection.localizedTitle()
         titleLabel.textColor = Theme.primaryColor
         titleLabel.font = UIFont.ows_dynamicTypeBody.ows_mediumWeight()
 
@@ -67,9 +67,7 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
         photoCollections = library.allPhotoCollections()
 
         let section = OWSTableSection()
-        let count = photoCollections.count
-        for index in 0..<count {
-            let collection = photoCollections.collection(at: index)
+        for collection in photoCollections {
             section.add(OWSTableItem.init(customCellBlock: { () -> UITableViewCell in
                 let cell = OWSTableItem.newCell()
 
@@ -94,7 +92,7 @@ class PhotoCollectionPickerController: OWSTableViewController, PhotoLibraryDeleg
 
                 let titleLabel = UILabel()
                 titleLabel.text = collection.localizedTitle()
-                titleLabel.font = UIFont.ows_regularFont(withSize: 18)
+                titleLabel.font = UIFont.ows_dynamicTypeBody
                 titleLabel.textColor = Theme.primaryColor
 
                 let stackView = UIStackView(arrangedSubviews: [imageView, titleLabel])

Signal/src/ViewControllers/PhotoLibrary/PhotoLibrary.swift

@@ -186,33 +186,12 @@ class PhotoCollection {
     }
 }
 
-class PhotoCollections {
-    let collections: [PhotoCollection]
-
-    init(collections: [PhotoCollection]) {
-        self.collections = collections
-    }
-
-    var count: Int {
-        return collections.count
-    }
-
-    func collection(at index: Int) -> PhotoCollection {
-        return collections[index]
-    }
-}
-
 class PhotoLibrary: NSObject, PHPhotoLibraryChangeObserver {
-    final class WeakDelegate {
-        weak var delegate: PhotoLibraryDelegate?
-        init(_ value: PhotoLibraryDelegate) {
-            delegate = value
-        }
-    }
+    typealias WeakDelegate = Weak<PhotoLibraryDelegate>
     var delegates = [WeakDelegate]()
 
     public func add(delegate: PhotoLibraryDelegate) {
-        delegates.append(WeakDelegate(delegate))
+        delegates.append(WeakDelegate(value: delegate))
     }
 
     var assetCollection: PHAssetCollection!
@@ -220,7 +199,7 @@ class PhotoLibrary: NSObject, PHPhotoLibraryChangeObserver {
     func photoLibraryDidChange(_ changeInstance: PHChange) {
         DispatchQueue.main.async {
             for weakDelegate in self.delegates {
-                weakDelegate.delegate?.photoLibraryDidChange(self)
+                weakDelegate.value?.photoLibraryDidChange(self)
             }
         }
     }
@@ -235,13 +214,13 @@ class PhotoLibrary: NSObject, PHPhotoLibraryChangeObserver {
     }
 
     func defaultPhotoCollection() -> PhotoCollection {
-        guard let photoCollection = allPhotoCollections().collections.first else {
+        guard let photoCollection = allPhotoCollections().first else {
             owsFail("Could not locate Camera Roll.")
         }
         return photoCollection
     }
 
-    func allPhotoCollections() -> PhotoCollections {
+    func allPhotoCollections() -> [PhotoCollection] {
         var collections = [PhotoCollection]()
         var collectionIds = Set<String>()
 
@@ -283,6 +262,6 @@ class PhotoLibrary: NSObject, PHPhotoLibraryChangeObserver {
         // Smart albums.
         processPHAssetCollections(PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .albumRegular, options: fetchOptions))
 
-        return PhotoCollections(collections: collections)
+        return collections
     }
 }