diff --git a/YBImageBrowser/Image/YBIBImageCache.h b/YBImageBrowser/Image/YBIBImageCache.h
index 0b8591f..428a1a5 100644
--- a/YBImageBrowser/Image/YBIBImageCache.h
+++ b/YBImageBrowser/Image/YBIBImageCache.h
@@ -10,10 +10,17 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
-@interface YBIBImageCache : NSObject
+@class YBIBImageCache;
+
+@interface NSObject (YBIBImageCache)
 
-/// 唯一单例
-+ (instancetype)sharedCache;
+/// 图片浏览器持有的图片缓存管理类
+@property (nonatomic, strong, readonly) YBIBImageCache *ybib_imageCache;
+
+@end
+
+
+@interface YBIBImageCache : NSObject
 
 /// 缓存数量限制（一个单位表示一个 YBIBImageData 产生的所有图片数据）
 @property (nonatomic, assign) NSUInteger imageCacheCountLimit;
diff --git a/YBImageBrowser/Image/YBIBImageCache.m b/YBImageBrowser/Image/YBIBImageCache.m
index 66748aa..ce46b51 100644
--- a/YBImageBrowser/Image/YBIBImageCache.m
+++ b/YBImageBrowser/Image/YBIBImageCache.m
@@ -9,6 +9,24 @@
 #import "YBIBImageCache.h"
 #import "YBIBImageCache+Internal.h"
 #import "YBIBUtilities.h"
+#import <objc/runtime.h>
+
+
+@implementation NSObject (YBIBImageCache)
+static void *YBIBImageCacheKey = &YBIBImageCacheKey;
+- (void)setYbib_imageCache:(YBIBImageCache *)ybib_imageCache {
+    objc_setAssociatedObject(self, YBIBImageCacheKey, ybib_imageCache, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+}
+- (YBIBImageCache *)ybib_imageCache {
+    YBIBImageCache *cache = objc_getAssociatedObject(self, YBIBImageCacheKey);
+    if (!cache) {
+        cache = [YBIBImageCache new];
+        self.ybib_imageCache = cache;
+    }
+    return cache;
+}
+@end
+
 
 @interface YBIBImageCachePack : NSObject
 @property (nonatomic, strong) UIImage *originImage;
@@ -25,15 +43,6 @@ @implementation YBIBImageCache {
 
 #pragma mark - life cycle
 
-+ (instancetype)sharedCache {
-    static YBIBImageCache *cache;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        cache = [YBIBImageCache new];
-    });
-    return cache;
-}
-
 - (void)dealloc {
     [[NSNotificationCenter defaultCenter] removeObserver:self name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
 }
diff --git a/YBImageBrowser/Image/YBIBImageData.m b/YBImageBrowser/Image/YBIBImageData.m
index e9a3df3..e49d94d 100644
--- a/YBImageBrowser/Image/YBIBImageData.m
+++ b/YBImageBrowser/Image/YBIBImageData.m
@@ -42,7 +42,7 @@ - (void)dealloc {
     if (_downloadToken) {
         [YBIBWebImageManager cancelTaskWithDownloadToken:_downloadToken];
     }
-    [YBIBImageCache.sharedCache removeForKey:self.cacheKey];
+    [self.imageCache removeForKey:self.cacheKey];
 }
 
 - (instancetype)init {
@@ -270,7 +270,7 @@ - (void)loadURL_download {
     self.loadingStatus = YBIBImageLoadingStatusDownloading;
     __weak typeof(self) wSelf = self;
     _downloadToken = [YBIBWebImageManager downloadImageWithURL:self.imageURL requestModifier:^NSURLRequest * _Nullable(NSURLRequest * _Nonnull request) {
-        return self.requestModifier ? self.requestModifier(self, request) : nil;
+        return self.requestModifier ? self.requestModifier(self, request) : request;
     } progress:^(NSInteger receivedSize, NSInteger expectedSize) {
         CGFloat progress = receivedSize * 1.0 / expectedSize ?: 0;
         YBIB_DISPATCH_ASYNC_MAIN(^{
@@ -445,7 +445,7 @@ - (void)stopLoading {
 }
 
 - (void)clearCache {
-    [YBIBImageCache.sharedCache removeForKey:self.cacheKey];
+    [self.imageCache removeForKey:self.cacheKey];
 }
 
 #pragma mark - private
@@ -536,6 +536,10 @@ - (void)UIImageWriteToSavedPhotosAlbum_completedWithImage:(UIImage *)image error
     [self saveToPhotoAlbumCompleteWithError:error];
 }
 
+- (YBIBImageCache *)imageCache {
+    return self.yb_backView.ybib_imageCache;
+}
+
 #pragma mark - <YBIBDataProtocol>
 
 @synthesize yb_isTransitioning = _yb_isTransitioning;
@@ -543,6 +547,7 @@ - (void)UIImageWriteToSavedPhotosAlbum_completedWithImage:(UIImage *)image error
 @synthesize yb_containerSize = _yb_containerSize;
 @synthesize yb_containerView = _yb_containerView;
 @synthesize yb_auxiliaryViewHandler = _yb_auxiliaryViewHandler;
+@synthesize yb_backView = _yb_backView;
 
 - (nonnull Class)yb_classOfCell {
     return YBIBImageCell.self;
@@ -609,7 +614,7 @@ - (void)setDelegate:(id<YBIBImageDataDelegate>)delegate {
     } else {
         _freezing = YES;
         // Remove the resident cache if '_delegate' is nil.
-        [YBIBImageCache.sharedCache removeResidentForKey:self.cacheKey];
+        [self.imageCache removeResidentForKey:self.cacheKey];
     }
 }
 - (id<YBIBImageDataDelegate>)delegate {
@@ -627,18 +632,18 @@ - (NSString *)cacheKey {
 
 - (void)setOriginImage:(__kindof UIImage *)originImage {
     // 'image' should be resident if '_delegate' exists.
-    [YBIBImageCache.sharedCache setImage:originImage type:YBIBImageCacheTypeOrigin forKey:self.cacheKey resident:self->_delegate != nil];
+    [self.imageCache setImage:originImage type:YBIBImageCacheTypeOrigin forKey:self.cacheKey resident:self->_delegate != nil];
 }
 - (UIImage *)originImage {
-    return [YBIBImageCache.sharedCache imageForKey:self.cacheKey type:YBIBImageCacheTypeOrigin];
+    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeOrigin];
 }
 
 - (void)setCompressedImage:(UIImage *)compressedImage {
     // 'image' should be resident if '_delegate' exists.
-    [YBIBImageCache.sharedCache setImage:compressedImage type:YBIBImageCacheTypeCompressed forKey:self.cacheKey resident:_delegate != nil];
+    [self.imageCache setImage:compressedImage type:YBIBImageCacheTypeCompressed forKey:self.cacheKey resident:_delegate != nil];
 }
 - (UIImage *)compressedImage {
-    return [YBIBImageCache.sharedCache imageForKey:self.cacheKey type:YBIBImageCacheTypeCompressed];
+    return [self.imageCache imageForKey:self.cacheKey type:YBIBImageCacheTypeCompressed];
 }
 
 - (void)setLoadingStatus:(YBIBImageLoadingStatus)loadingStatus {