update image view

iOSClient/Viewer/NCViewerImage/NCViewerImagePageContainer.swift

@@ -239,7 +239,7 @@ class NCViewerImagePageContainer: UIViewController, UIGestureRecognizerDelegate
             NCNetworking.shared.download(metadata: metadata, selector: "") { (_) in }
         }
         
-        if viewerImageZoom.isDefaultImage && metadata.hasPreview {
+        if !CCUtility.fileProviderStoragePreviewIconExists(metadata.ocId, etag: metadata.etag) && metadata.hasPreview {
             
             let fileNamePath = CCUtility.returnFileNamePath(fromFileName: metadata.fileName, serverUrl: metadata.serverUrl, urlBase: metadata.urlBase, account: metadata.account)!
             let fileNamePreviewLocalPath = CCUtility.getDirectoryProviderStoragePreviewOcId(metadata.ocId, etag: metadata.etag)!

iOSClient/Viewer/NCViewerImage/NCViewerImageZoom.swift

@@ -34,7 +34,6 @@ class NCViewerImageZoom: UIViewController {
         
     weak var delegate: NCViewerImagePageContainer?
     
-    var isDefaultImage: Bool = false
     var image: UIImage?
     var metadata: tableMetadata = tableMetadata()
     var index: Int = 0
@@ -55,7 +54,6 @@ class NCViewerImageZoom: UIViewController {
         
         if image == nil {
             image = CCGraphics.changeThemingColorImage(UIImage.init(named: "noPreview"), width: view.frame.width, height: view.frame.width, color: .gray)
-            isDefaultImage = true
         }
         
         if let image = image {