diff --git a/PhotoBrowser/ZLPhotoActionSheet.m b/PhotoBrowser/ZLPhotoActionSheet.m
index 82d288bd..1e53e2de 100644
--- a/PhotoBrowser/ZLPhotoActionSheet.m
+++ b/PhotoBrowser/ZLPhotoActionSheet.m
@@ -919,16 +919,26 @@ - (void)saveImage:(UIImage *)image videoUrl:(NSURL *)videoUrl
 
 - (void)handleDataArray:(ZLPhotoModel *)model
 {
+    zl_weakify(self);
+    BOOL (^shouldSelect)(void) = ^BOOL() {
+        zl_strongify(weakSelf);
+        if (model.type == ZLAssetMediaTypeVideo) {
+            return (model.asset.duration <= strongSelf.configuration.maxVideoDuration);
+        }
+        return YES;
+    };
+    
     [self.arrDataSources insertObject:model atIndex:0];
     if (self.arrDataSources.count > self.configuration.maxPreviewCount) {
         [self.arrDataSources removeLastObject];
     }
-    if (self.configuration.maxSelectCount > 1 && self.arrSelectedModels.count < self.configuration.maxSelectCount) {
-        model.selected = YES;
+    BOOL sel = shouldSelect();
+    if (self.configuration.maxSelectCount > 1 && self.arrSelectedModels.count < self.configuration.maxSelectCount && sel) {
+        model.selected = sel;
         [self.arrSelectedModels addObject:model];
-    } else if (self.configuration.maxSelectCount == 1 && !self.arrSelectedModels.count) {
+    } else if (self.configuration.maxSelectCount == 1 && !self.arrSelectedModels.count && sel) {
         if (![self shouldDirectEdit:model]) {
-            model.selected = YES;
+            model.selected = sel;
             [self.arrSelectedModels addObject:model];
             [self requestSelPhotos:nil data:self.arrSelectedModels hideAfterCallBack:YES];
             return;
diff --git a/PhotoBrowser/ZLPhotoBrowser.m b/PhotoBrowser/ZLPhotoBrowser.m
index c4281637..52dc54e8 100644
--- a/PhotoBrowser/ZLPhotoBrowser.m
+++ b/PhotoBrowser/ZLPhotoBrowser.m
@@ -47,6 +47,8 @@ - (void)setConfiguration:(ZLPhotoConfiguration *)configuration
     [self.navigationBar setBackgroundImage:[self imageWithColor:configuration.navBarColor] forBarMetrics:UIBarMetricsDefault];
     [self.navigationBar setTintColor:configuration.navTitleColor];
     [self.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: configuration.navTitleColor}];
+    [self.navigationBar setBackIndicatorImage:GetImageWithName(@"zl_navBack")];
+    [self.navigationBar setBackIndicatorTransitionMaskImage:GetImageWithName(@"zl_navBack")];
 }
 
 - (UIImage *)imageWithColor:(UIColor *)color
diff --git a/PhotoBrowser/ZLShowBigImgViewController.m b/PhotoBrowser/ZLShowBigImgViewController.m
index 5cee74a6..92308654 100644
--- a/PhotoBrowser/ZLShowBigImgViewController.m
+++ b/PhotoBrowser/ZLShowBigImgViewController.m
@@ -189,7 +189,7 @@ - (void)initNavView
     [self.view addSubview:_navView];
     
     _btnBack = [UIButton buttonWithType:UIButtonTypeCustom];
-    [_btnBack setImage:GetImageWithName(@"zl_navBackBtn") forState:UIControlStateNormal];
+    [_btnBack setImage:GetImageWithName(@"zl_navBack") forState:UIControlStateNormal];
     [_btnBack setImageEdgeInsets:UIEdgeInsetsMake(0, -10, 0, 0)];
     [_btnBack addTarget:self action:@selector(btnBack_Click) forControlEvents:UIControlEventTouchUpInside];
     [_navView addSubview:_btnBack];
diff --git a/PhotoBrowser/ZLThumbnailViewController.m b/PhotoBrowser/ZLThumbnailViewController.m
index ac165a2f..197abb07 100644
--- a/PhotoBrowser/ZLThumbnailViewController.m
+++ b/PhotoBrowser/ZLThumbnailViewController.m
@@ -916,23 +916,33 @@ - (void)handleDataArray:(ZLPhotoModel *)model
     ZLImageNavigationController *nav = (ZLImageNavigationController *)self.navigationController;
     ZLPhotoConfiguration *configuration = nav.configuration;
     
+    BOOL (^shouldSelect)(void) = ^BOOL() {
+        if (model.type == ZLAssetMediaTypeVideo) {
+            return (model.asset.duration <= configuration.maxVideoDuration);
+        }
+        return YES;
+    };
+    
     if (configuration.sortAscending) {
         [self.arrDataSources addObject:model];
     } else {
         [self.arrDataSources insertObject:model atIndex:0];
     }
-    if (configuration.maxSelectCount > 1 && nav.arrSelectedModels.count < configuration.maxSelectCount) {
-        model.selected = YES;
+    
+    BOOL sel = shouldSelect();
+    if (configuration.maxSelectCount > 1 && nav.arrSelectedModels.count < configuration.maxSelectCount && sel) {
+        model.selected = sel;
         [nav.arrSelectedModels addObject:model];
-        self.albumListModel = [ZLPhotoManager getCameraRollAlbumList:configuration.allowSelectVideo allowSelectImage:configuration.allowSelectImage];
-    } else if (configuration.maxSelectCount == 1 && !nav.arrSelectedModels.count) {
+    } else if (configuration.maxSelectCount == 1 && !nav.arrSelectedModels.count && sel) {
         if (![self shouldDirectEdit:model]) {
-            model.selected = YES;
+            model.selected = sel;
             [nav.arrSelectedModels addObject:model];
             [self btnDone_Click:nil];
             return;
         }
     }
+    
+    self.albumListModel = [ZLPhotoManager getCameraRollAlbumList:configuration.allowSelectVideo allowSelectImage:configuration.allowSelectImage];
     [self.collectionView reloadData];
     [self scrollToBottom];
     [self resetBottomBtnsStatus:YES];
diff --git a/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@2x.png b/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@2x.png
new file mode 100644
index 00000000..a7f2e91a
Binary files /dev/null and b/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@2x.png differ
diff --git a/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@3x.png b/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@3x.png
new file mode 100644
index 00000000..b8a6760b
Binary files /dev/null and b/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBack@3x.png differ
diff --git a/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBackBtn@2x.png b/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBackBtn@2x.png
deleted file mode 100755
index 633b9e6d..00000000
Binary files a/PhotoBrowser/resource/ZLPhotoBrowser.bundle/zl_navBackBtn@2x.png and /dev/null differ
diff --git a/ZLPhotoBrowser/ViewController.m b/ZLPhotoBrowser/ViewController.m
index e345e846..09a0e39c 100644
--- a/ZLPhotoBrowser/ViewController.m
+++ b/ZLPhotoBrowser/ViewController.m
@@ -142,13 +142,15 @@ - (ZLPhotoActionSheet *)getPas
     actionSheet.configuration.languageType = self.languageSegment.selectedSegmentIndex;
     //自定义多语言
 //    actionSheet.configuration.customLanguageKeyValue = @{@"ZLPhotoBrowserCameraText": @"没错，我就是一个相机"};
+    //自定义图片
+//    actionSheet.configuration.customImageNames = @[@"zl_navBack"];
     
     //是否使用系统相机
 //    actionSheet.configuration.useSystemCamera = YES;
 //    actionSheet.configuration.sessionPreset = ZLCaptureSessionPreset1920x1080;
 //    actionSheet.configuration.exportVideoType = ZLExportVideoTypeMp4;
 //    actionSheet.configuration.allowRecordVideo = NO;
-    
+//    actionSheet.configuration.maxVideoDuration = 5;
 #pragma mark - required
     //如果调用的方法没有传sender，则该属性必须提前赋值
     actionSheet.sender = self;