Added properties for customizations.

Example/NYTViewController.m

@@ -31,9 +31,13 @@ @interface NYTViewController () <NYTPhotosViewControllerDelegate>
 @implementation NYTViewController
 
 - (IBAction)imageButtonTapped:(id)sender {
+
     self.dataSource = [self.class newTimesBuildingDataSource];
 
     NYTPhotosViewController *photosViewController = [[NYTPhotosViewController alloc] initWithDataSource:self.dataSource initialPhoto:nil delegate:self];
+    photosViewController.delegate = self;
+    photosViewController.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor], NSFontAttributeName : [UIFont fontWithName:@"Arial" size:20.0]};
+    photosViewController.isTitleBackgroundSolid = YES;
 
     [self presentViewController:photosViewController animated:YES completion:nil];
 

NYTPhotoViewer.podspec

@@ -12,7 +12,7 @@ Pod::Spec.new do |s|
   s.license          = { :type => 'Apache 2.0' }
   s.source           = { :git => "https://github.com/NYTimes/NYTPhotoViewer.git", :tag => s.version.to_s }
 
-  s.platform     = :ios, '8.0'
+  s.platform     = :ios, '9.0'
   s.requires_arc = true
 
   s.subspec 'Core' do |ss|

NYTPhotoViewer/NYTPhotoViewerSinglePhotoDataSource.h

@@ -22,7 +22,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  *  The designated initializer that takes and stores a single photo.
  *
- *  @param photos An object conforming to the `NYTPhoto` protocol.
+ *  @param photo An object conforming to the `NYTPhoto` protocol.
  *
  *  @return A fully initialized data source.
  */

NYTPhotoViewer/NYTPhotosOverlayView.h

@@ -25,6 +25,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @property (nonatomic, copy, nullable) NSString *title;
 
+/**
+ *  The overlay title background color
+ */
+@property (nonatomic) UIColor * backgroundColor;
+
 /**
  *  The attributes of the overlay's title.
  */

NYTPhotoViewer/NYTPhotosOverlayView.m

@@ -68,8 +68,6 @@ - (void)setupNavigationBar {
     self.navigationBar = [[UINavigationBar alloc] init];
     self.navigationBar.translatesAutoresizingMaskIntoConstraints = NO;
 
-    // Make navigation bar background fully transparent.
-    self.navigationBar.backgroundColor = [UIColor clearColor];
     self.navigationBar.barTintColor = nil;
     self.navigationBar.translucent = YES;
     self.navigationBar.shadowImage = [[UIImage alloc] init];
@@ -93,6 +91,10 @@ - (void)setupNavigationBar {
     }
 }
 
+-(void)setBackgroundColor:(UIColor *)backgroundColor{
+    self.navigationBar.backgroundColor = backgroundColor;
+}
+
 - (void)setCaptionView:(UIView *)captionView {
     if (self.captionView == captionView) {
         return;

NYTPhotoViewer/NYTPhotosViewController.h

@@ -75,6 +75,21 @@ extern NSString * const NYTPhotosViewControllerDidDismissNotification;
  */
 @property (nonatomic, readonly, nullable) NYTPhotosOverlayView *overlayView;
 
+/**
+ *  Set custom title attributes of overlayView.
+ */
+@property (nonatomic, copy, nullable)NSDictionary <NSString *, id> *titleTextAttributes;
+
+/**
+ *  The overlay view title background. Transparent by default. If solid, color is similar with controller view.
+ */
+@property (nonatomic)BOOL isTitleBackgroundSolid;
+
+/**
+ *  The view's background color
+ */
+@property (nonatomic)UIColor * backgroundColor;
+
 /**
  *  The left bar button item overlaying the photo.
  */
@@ -146,7 +161,7 @@ extern NSString * const NYTPhotosViewControllerDidDismissNotification;
  *
  *  This method has no effect if the given index is out of bounds in the data source.
  *
- *  @param photo The index of the photo which changed in the data source.
+ *  @param photoIndex The index of the photo which changed in the data source.
  */
 - (void)updatePhotoAtIndex:(NSInteger)photoIndex;
 

NYTPhotoViewer/NYTPhotosViewController.m

@@ -109,7 +109,7 @@ - (void)viewDidLoad {
     [self configurePageViewControllerWithInitialPhoto];
 
     self.view.tintColor = [UIColor whiteColor];
-    self.view.backgroundColor = [UIColor blackColor];
+    self.view.backgroundColor = self.backgroundColor?self.backgroundColor:[UIColor blackColor];
     self.pageViewController.view.backgroundColor = [UIColor clearColor];
 
     [self.pageViewController.view addGestureRecognizer:self.panGestureRecognizer];
@@ -231,7 +231,10 @@ - (void)addOverlayView {
     NSAssert(self.overlayView != nil, @"_overlayView must be set during initialization, to provide bar button items for this %@", NSStringFromClass([self class]));
 
     UIColor *textColor = self.view.tintColor ?: [UIColor whiteColor];
-    self.overlayView.titleTextAttributes = @{NSForegroundColorAttributeName: textColor};
+
+    self.overlayView.titleTextAttributes = (self.titleTextAttributes)?self.titleTextAttributes:@{NSForegroundColorAttributeName: textColor};
+
+    self.overlayView.backgroundColor = self.isTitleBackgroundSolid?self.view.backgroundColor:[UIColor clearColor];
 
     [self updateOverlayInformation];
     [self.view addSubview:self.overlayView];
@@ -314,6 +317,14 @@ - (void)displayActivityViewController:(UIActivityViewController *)controller ani
     }
 }
 
+-(void)setTitleTextAttributes:(NSDictionary<NSString *,id> *)titleTextAttributes{
+    _titleTextAttributes = titleTextAttributes;
+}
+
+-(void)setIsTitleBackgroundSolid:(BOOL)isTitleBackgroundSolid{
+    _isTitleBackgroundSolid = isTitleBackgroundSolid;
+}
+
 - (UIBarButtonItem *)leftBarButtonItem {
     return self.overlayView.leftBarButtonItem;
 }