+ Allow single selection of items

FacebookImagePicker/OLAlbumViewController.h

@@ -23,4 +23,5 @@
 @property (nonatomic, weak) id<OLAlbumViewControllerDelegate> delegate;
 @property (nonatomic, strong) NSArray/*<OLFacebookImage>*/ *selected;
 @property (nonatomic, assign) BOOL shouldDisplayLogoutButton;
+@property (nonatomic, assign) BOOL isMultiselectEnabled;
 @end

FacebookImagePicker/OLAlbumViewController.m

@@ -120,6 +120,11 @@ - (void)viewDidAppear:(BOOL)animated {
     }
 }
 
+- (void)setIsMultiselectEnabled:(BOOL)isMultiselectEnabled
+{
+    _isMultiselectEnabled = isMultiselectEnabled;
+}
+
 - (void)setShouldDisplayLogoutButton:(BOOL)shouldDisplayLogoutButton
 {
     _shouldDisplayLogoutButton = shouldDisplayLogoutButton;
@@ -230,6 +235,7 @@ - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPa
 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
     OLFacebookAlbum *album = [self.albums objectAtIndex:indexPath.row];
     self.photoViewController = [[OLPhotoViewController alloc] initWithAlbum:album];
+    self.photoViewController.isMultiselectEnabled = self.isMultiselectEnabled;
     self.photoViewController.selected = self.selected;
     self.photoViewController.delegate = self;
     [self.navigationController pushViewController:self.photoViewController animated:YES];
@@ -257,7 +263,10 @@ - (void)photoViewController:(OLPhotoViewController *)photoController didFailWith
 }
 
 - (void)photoViewController:(OLPhotoViewController *)photoController didSelectImage:(OLFacebookImage *)image{
-    [self updateSelectedFromPhotoViewController];
+    if(self.isMultiselectEnabled) {
+        [self updateSelectedFromPhotoViewController];
+    }
+
     if ([self.delegate respondsToSelector:@selector(albumViewController:didSelectImage:)]){
         [self.delegate albumViewController:self didSelectImage:image];
     }

FacebookImagePicker/OLFacebookImagePickerController.h

@@ -42,4 +42,6 @@
 
 @property (nonatomic, assign) BOOL shouldDisplayLogoutButton;
 
+@property (nonatomic, assign) BOOL isMultiselectEnabled;
+
 @end

FacebookImagePicker/OLFacebookImagePickerController.m

@@ -26,6 +26,7 @@ - (id)init {
     vc.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelButtonClicked)];
     if (self = [super initWithRootViewController:vc]) {
         _shouldDisplayLogoutButton = YES;
+        _isMultiselectEnabled = YES;
         if ([FBSDKAccessToken currentAccessToken]){
             [self showAlbumList];
         }
@@ -68,6 +69,7 @@ - (void)showAlbumList{
     OLAlbumViewController *albumController = [[OLAlbumViewController alloc] init];
     self.albumVC = albumController;
     self.albumVC.delegate = self;
+    self.albumVC.isMultiselectEnabled = self.isMultiselectEnabled;
     self.albumVC.shouldDisplayLogoutButton = self.shouldDisplayLogoutButton;
     self.viewControllers = @[albumController];
 }
@@ -80,6 +82,12 @@ - (NSArray *)selected {
     return self.albumVC.selected;
 }
 
+- (void)setIsMultiselectEnabled:(BOOL)isMultiselectEnabled
+{
+    _isMultiselectEnabled = isMultiselectEnabled;
+    self.albumVC.isMultiselectEnabled = self.isMultiselectEnabled;
+}
+
 - (void)setShouldDisplayLogoutButton:(BOOL)shouldDisplayLogoutButton
 {
     _shouldDisplayLogoutButton = shouldDisplayLogoutButton;

FacebookImagePicker/OLPhotoViewController.h

@@ -27,5 +27,6 @@
 
 @property (nonatomic, weak) id<OLPhotoViewControllerDelegate> delegate;
 @property (nonatomic, strong) NSArray/*<OLFacebookImage>*/ *selected;
+@property (nonatomic, assign) BOOL isMultiselectEnabled;
 
 @end

FacebookImagePicker/OLPhotoViewController.m

@@ -60,7 +60,7 @@ - (void)viewDidLoad {
     layout.minimumLineSpacing           = 1.0;
     layout.footerReferenceSize          = CGSizeMake(0, 0);
     self.collectionView.collectionViewLayout = layout;
-    self.collectionView.allowsMultipleSelection = YES;
+    self.collectionView.allowsMultipleSelection = self.isMultiselectEnabled;
 
     [self.collectionView registerClass:[OLFacebookImagePickerCell class] forCellWithReuseIdentifier:kImagePickerCellReuseIdentifier];
     [self.collectionView registerClass:[SupplementaryView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:kSupplementaryViewFooterReuseIdentifier];
@@ -69,6 +69,12 @@ - (void)viewDidLoad {
     [self loadNextPage];
 }
 
+- (void) setIsMultiselectEnabled:(BOOL)isMultiselectEnabled
+{
+    _isMultiselectEnabled = isMultiselectEnabled;
+    self.collectionView.allowsMultipleSelection = isMultiselectEnabled;
+}
+
 - (NSArray *)selected {
     NSMutableArray *selectedItems = [[NSMutableArray alloc] init];
     NSArray *selectedPaths = self.collectionView.indexPathsForSelectedItems;
@@ -204,7 +210,13 @@ -(void) collectionView:(UICollectionView *)collectionView didDeselectItemAtIndex
 }
 
 -(void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{
-    [self updateTitleWithSelectedIndexPaths:collectionView.indexPathsForSelectedItems];
+    if(self.isMultiselectEnabled) {
+        [self updateTitleWithSelectedIndexPaths:collectionView.indexPathsForSelectedItems];
+
+    } else {
+        [collectionView deselectItemAtIndexPath:indexPath animated:NO];
+    }
+
     if ([self.delegate respondsToSelector:@selector(photoViewController:didSelectImage:)]){
         [self.delegate photoViewController:self didSelectImage:[self.photos objectAtIndex:indexPath.item]];
     }