add images preview

iOSClient/Images.xcassets/noPreviewAudio.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "noPreviewAudio.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "preserves-vector-representation" : true
+  }
+}

iOSClient/Images.xcassets/noPreviewAudio.imageset/noPreviewAudio.pdf

@@ -0,0 +1,55 @@
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+%%EOF

iOSClient/Images.xcassets/noPreviewVideo.imageset/Contents.json

@@ -0,0 +1,15 @@
+{
+  "images" : [
+    {
+      "filename" : "noPreviewVideo.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "properties" : {
+    "preserves-vector-representation" : true
+  }
+}

iOSClient/Images.xcassets/noPreviewVideo.imageset/noPreviewVideo.pdf

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+%Óëéá
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iOSClient/Viewer/NCViewerImage/NCViewerImageZoom.swift

@@ -73,7 +73,10 @@ class NCViewerImageZoom: UIViewController {
         view.addGestureRecognizer(doubleTapGestureRecognizer)
         
         if image == nil {
-            image = CCGraphics.changeThemingColorImage(UIImage.init(named: "noPreview"), width: view.frame.width, height: view.frame.width, color: .gray)
+            var named = "noPreview"
+            if metadata.typeFile == k_metadataTypeFile_audio { named = "noPreviewAudio" }
+            if metadata.typeFile == k_metadataTypeFile_video { named = "noPreviewVideo" }
+            image = CCGraphics.changeThemingColorImage(UIImage.init(named: named), width: view.frame.width, height: view.frame.width, color: .gray)
         }
         
         if let image = image {