下载时长

WXDownloadingKit/Downloading/Model/CODownloadModel.m

@@ -139,6 +139,11 @@ static NSString * const downloadModelCacheName = @"downloadModel";
     if (self.lesson_type != COLessonTypeVideo) {
         return @"";
     }
+    
+    if (WXCOStringIsEmpty(self.video_length)) {
+        return @"";
+    }
+    
     return [NSString stringWithFormat:@"时长：%@", self.video_length];
 }
 

WXDownloadingKit/Downloading/Other/WXCOMacros.h

@@ -83,10 +83,14 @@ typedef NS_ENUM(NSUInteger, COLiveType) {
 
 /// PDF文档的类型
 typedef NS_ENUM(NSUInteger, COPdfType) {
-    /// 讲义类型的PDF
+    /// 讲义类型的 PDF
     COPdfTypeHandouts,
-    /// 试卷类型的PDF
-    COPdfTypePaper
+    
+    /// 试卷类型的 PDF
+    COPdfTypePaper,
+    
+    /// 练习类型的 PDF
+    COPdfTypeExercise
 };