Respond to CR.

// FREEBIE

Signal/src/Models/OWSMessagesBubblesSizeCalculator.m

@@ -47,6 +47,15 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSMessagesBubblesSizeCalculator
 
+- (instancetype)init
+{
+    if (self = [super init]) {
+        _referenceSystemMessageCell = [OWSSystemMessageCell new];
+        _referenceUnreadIndicatorCell = [OWSUnreadIndicatorCell new];
+    }
+    return self;
+}
+
 /**
  *  Computes and returns the size of the `messageBubbleImageView` property
  *  of a `JSQMessagesCollectionViewCell` for the specified messageData at indexPath.
@@ -119,10 +128,6 @@ NS_ASSUME_NONNULL_BEGIN
         return [cachedSize CGSizeValue];
     }
 
-    if (!self.referenceSystemMessageCell) {
-        _referenceSystemMessageCell = [OWSSystemMessageCell new];
-    }
-
     CGSize result = [self.referenceSystemMessageCell cellSizeForInteraction:interaction
                                                         collectionViewWidth:layout.collectionView.width];
 
@@ -143,10 +148,6 @@ NS_ASSUME_NONNULL_BEGIN
         return [cachedSize CGSizeValue];
     }
 
-    if (!self.referenceUnreadIndicatorCell) {
-        _referenceUnreadIndicatorCell = [OWSUnreadIndicatorCell new];
-    }
-
     CGSize result = [self.referenceUnreadIndicatorCell cellSizeForInteraction:interaction
                                                           collectionViewWidth:layout.collectionView.width];
 

Signal/src/ViewControllers/ConversationView/MessagesViewController.m

@@ -1308,7 +1308,7 @@ typedef enum : NSUInteger {
     }
 
     // Bubbles
-    self.collectionView.collectionViewLayout.bubbleSizeCalculator = [[OWSMessagesBubblesSizeCalculator alloc] init];
+    self.collectionView.collectionViewLayout.bubbleSizeCalculator = [OWSMessagesBubblesSizeCalculator new];
     JSQMessagesBubbleImageFactory *bubbleFactory = [[JSQMessagesBubbleImageFactory alloc] init];
     self.incomingBubbleImageData =
         [bubbleFactory incomingMessagesBubbleImageWithColor:[UIColor jsq_messageBubbleLightGrayColor]];

Signal/src/views/OWSSystemMessageCell.m

@@ -31,6 +31,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSSystemMessageCell
 
+// `[UIView init]` invokes `[self initWithFrame:...]`.
 - (instancetype)initWithFrame:(CGRect)frame
 {
     if (self = [super initWithFrame:frame]) {

Signal/src/views/OWSUnreadIndicatorCell.m

@@ -29,6 +29,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSUnreadIndicatorCell
 
+// `[UIView init]` invokes `[self initWithFrame:...]`.
 - (instancetype)initWithFrame:(CGRect)frame
 {
     if (self = [super initWithFrame:frame]) {