use protocol rather the the real model. users can define which image downloader(sdwebimage or afnetworking) to use by them self.

Author: shiyj

MWPhotoBrowser.podspec

@@ -27,22 +27,33 @@ Pod::Spec.new do |s|
     :git => 'https://github.com/mwaterfall/MWPhotoBrowser.git',
     :tag => '2.1.2'
   }
+
   s.platform = :ios, '7.0'
-  s.source_files = 'Pod/Classes/**/*'
-  s.resource_bundles = {
-    'MWPhotoBrowser' => ['Pod/Assets/*.png']
-  }
-  s.requires_arc = true
+  s.subspec 'core' do |core|
+    core.source_files = 'Pod/Classes/**/*'
+    core.exclude_files = 'Pod/Classes/MWPhoto.{h,m}'
+
+    core.resource_bundles = {
+      'MWPhotoBrowser' => ['Pod/Assets/*.png']
+    }
+    core.requires_arc = true
+
+    core.frameworks = 'ImageIO', 'QuartzCore', 'AssetsLibrary', 'MediaPlayer'
+    core.weak_frameworks = 'Photos'
 
-  s.frameworks = 'ImageIO', 'QuartzCore', 'AssetsLibrary', 'MediaPlayer'
-  s.weak_frameworks = 'Photos'
+    core.dependency 'MBProgressHUD'
+    core.dependency 'DACircularProgress', '~> 2.3'
+  end
 
-  s.dependency 'MBProgressHUD', '~> 0.9'
-  s.dependency 'DACircularProgress', '~> 2.3'
+  s.subspec 'SDWebImage' do |sdweb|
+    sdweb.source_files = 'Pod/Classes/MWPhoto.{h,m}'
+    sdweb.dependency 'MWPhotoBrowser/core'
+    # SDWebImage
+    # 3.7.2 contains bugs downloading local files
+    # https://github.com/rs/SDWebImage/issues/1109
+    sdweb.dependency 'SDWebImage', '~> 3.7', '!= 3.7.2'
+  end
 
-  # SDWebImage
-  # 3.7.2 contains bugs downloading local files
-  # https://github.com/rs/SDWebImage/issues/1109
-  s.dependency 'SDWebImage', '~> 3.7', '!= 3.7.2'
+  s.default_subspec = 'SDWebImage'
 
 end

Pod/Classes/MWCaptionView.m

@@ -8,7 +8,7 @@
 
 #import "MWCommon.h"
 #import "MWCaptionView.h"
-#import "MWPhoto.h"
+#import "MWPhotoProtocol.h"
 
 static const CGFloat labelPadding = 10;
 

Pod/Classes/MWGridCell.h

@@ -7,7 +7,7 @@
 //
 
 #import <UIKit/UIKit.h>
-#import "MWPhoto.h"
+#import "MWPhotoProtocol.h"
 #import "MWGridViewController.h"
 
 @interface MWGridCell : UICollectionViewCell {}

Pod/Classes/MWPhotoBrowser.h

@@ -7,7 +7,6 @@
 //
 
 #import <UIKit/UIKit.h>
-#import "MWPhoto.h"
 #import "MWPhotoProtocol.h"
 #import "MWCaptionView.h"
 

Pod/Classes/MWPhotoBrowser.m

@@ -10,7 +10,6 @@
 #import "MWCommon.h"
 #import "MWPhotoBrowser.h"
 #import "MWPhotoBrowserPrivate.h"
-#import "SDImageCache.h"
 #import "UIImage+MWPhotoBrowser.h"
 
 #define PADDING                  10
@@ -96,7 +95,6 @@ - (void)dealloc {
     _pagingScrollView.delegate = nil;
     [[NSNotificationCenter defaultCenter] removeObserver:self];
     [self releaseAllUnderlyingPhotos:NO];
-    [[SDImageCache sharedImageCache] clearMemory]; // clear memory
 }
 
 - (void)releaseAllUnderlyingPhotos:(BOOL)preserveCurrent {
@@ -382,7 +380,7 @@ - (void)viewDidAppear:(BOOL)animated {
     // Autoplay if first is video
     if (!_viewHasAppearedInitially) {
         if (_autoPlayOnAppear) {
-            MWPhoto *photo = [self photoAtIndex:_currentPageIndex];
+            id<MWPhoto> photo = [self photoAtIndex:_currentPageIndex];
             if ([photo respondsToSelector:@selector(isVideo)] && photo.isVideo) {
                 [self playVideoAtIndex:_currentPageIndex];
             }
@@ -1108,7 +1106,7 @@ - (void)updateNavigation {
 	_nextButton.enabled = (_currentPageIndex < numberOfPhotos - 1);
 
     // Disable action button if there is no image or it's a video
-    MWPhoto *photo = [self photoAtIndex:_currentPageIndex];
+    id<MWPhoto> photo = [self photoAtIndex:_currentPageIndex];
     if ([photo underlyingImage] == nil || ([photo respondsToSelector:@selector(isVideo)] && photo.isVideo)) {
         _actionButton.enabled = NO;
         _actionButton.tintColor = [UIColor clearColor]; // Tint to hide button

Pod/Classes/MWZoomingScrollView.m

@@ -10,7 +10,7 @@
 #import "MWCommon.h"
 #import "MWZoomingScrollView.h"
 #import "MWPhotoBrowser.h"
-#import "MWPhoto.h"
+#import "MWPhotoProtocol.h"
 #import "MWPhotoBrowserPrivate.h"
 #import "UIImage+MWPhotoBrowser.h"