> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/ios/changelogs/version-6/v6-10-6.md).

# Version 6.10.6 Changelog (June 28th, 2019)

World's #1 PDF SDK Library for Web, Mobile, Server, Desktop

* Version: 6.10.6.71256
* Release Date: June 28th, 2019
* Built with Xcode 10.2.1 (10E1001)

## New

* A new OCG (Optional Content Groups) layer control that lists the OCG layers in a document and allows specific layers to be shown or hidden. The OCG layer control is displayed in the `PTNavigationListsViewController`. By default the layer control is shown or hidden when OCG layers are detected in the document. This automatic behavior can be changed with the [`pdfLayerViewControllerVisibility`](https://sdk.apryse.com/api/ios/Classes/PTNavigationListsViewController.html#/c:objc\(cs\)PTNavigationListsViewController\(py\)pdfLayerViewControllerVisibility) property on the `PTNavigationListsViewController` class.

![](https://4149080208-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FgY6xtY9ZQd9XMpvWlGM0%2Fuploads%2Fgit-blob-17351842cf33fd96a9c9b5cc4fe9199db779eaac%2Fbda0bae9a79267bc7555d0e90ad790278903e621-1280x1280.gif?alt=media)

* Realtime collaboration support has been added to `Tools.framework`. The Collaboration sample in the SDK has also been updated to include a WebViewer Server backend in addition to the existing Firebase backend. For more information please see our [collaboration guide](/ios/collaboration/overview-i.md).
* Measurement annotations, created with the `PTRulerCreate`, `PTAreaCreate`, or `PTPerimeterCreate` tools, can now be calibrated to a specific reference value from the measurement annotation's "Calibrate" menu item.
* All controls created internally by the [`PTDocumentViewController`](https://sdk.apryse.com/api/ios/Classes/PTDocumentViewController.html) class are now overridable via the [`PTOverrides`](/ios/annotation/customization.md#override-classes)[ system](/ios/annotation/customization.md#override-classes).
* Properties have been added to the `PTPDFViewCtrl` class for existing getter and/or setter methods.

## Bug fixes

* Fixed a bug preventing long-pressing to move the cursor while editing a text form-field.
* A number of miscellaneous bug fixes.

## API diff

* Getter and setter methods on the `PTPDFViewCtrl` class that are now wrapped in properties are no longer available in Swift. For example, previously to get the page count of a PDFViewCtrl, `pdfViewCtrl.getPageCount()` would be used. The [`GetPageCount`](https://sdk.apryse.com/api/ios/Classes/PTPDFViewCtrl.html#/c:objc\(cs\)PTPDFViewCtrl\(im\)GetPageCount) method can still be used from Objective-C, but the [`pageCount`](https://sdk.apryse.com/api/ios/Classes/PTPDFViewCtrl.html#/c:objc\(cs\)PTPDFViewCtrl\(py\)pageCount) property must be used from Swift: `pdfViewCtrl.pageCount`.
* The `UICollectionView` used by the `PTThumbnailsViewController` class can now be accessed via a [`collectionView`](https://sdk.apryse.com/api/ios/Classes/PTThumbnailsViewController.html#/c:objc\(cs\)PTThumbnailsViewController\(py\)collectionView) property.


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