View mode

There are a few view modes which can be adjusted to provide an optimal presentation such as layout, fit, or reflow.

Layout

Page layout/presentation mode on iOS

PDFViewCtrl supports a number of page layouts (presentation modes), as listed below:

Page presentation mode	Description
e_trn_single_page	Displays one page at a time, swiping left and right to change pages.
e_trn_single_continuous	Displays one page at a time, scrolling up and down to change pages.
e_trn_facing	Displays two pages at a time, with odd-numbered pages on left, swiping left and right to change pages.
e_trn_facing_continuous	Displays pages in two columns, with odd-numbered pages on left, scrolling up and down to change pages.
e_trn_facing_cover	Displays two pages at a time, with odd-numbered pages on right, swiping left and right to change pages.
e_trn_facing_continuous_cover	Display pages in two columns, with odd-numbered pages on right, scrolling up and down to change pages.

Set the page presentation mode

You can set page presentation mode in your PDFViewCtrl by using setPagePresentationMode(_:):

Swift

self.pdfViewCtrl.setPagePresentationMode(e_trn_facing);

Obj-C

[self.pdfViewCtrl SetPagePresentationMode:e_trn_facing];

Fit

Page fit & default zoom mode on iOS

PDFViewCtrl's page view mode controls the default zoom level of pages and documents. New documents will automatically open at the zoom level specified by the mode.

Page view modes

PDFViewCtrl supports the following page view modes:

Page view mode	Description	Screenshot-portrait	Screenshot-landscape
e_trn_fit_page	The zoom is set so that the entire page is visible without scrolling.
e_trn_fit_width	The zoom is set so that the page's width matches the viewer's width.
e_trn_fit_height	The zoom is set so that the page's height matches the viewer's height.
e_trn_zoom	The viewer's zoom is not adjusted based on the page.

Set the default page fit mode

You can set a default page fit mode in your PDFViewCtrl by using SetPageRefViewMode:.

Set the page fit mode dynamically

If you want to dynamically change the page fit mode, use SetPageViewMode:. Note that when the user flips the page, the page view mode will be automatically reset to the default mode set by setPageRefViewMode.

Swift

self.pdfViewCtrl.setPageViewMode(e_trn_fit_width);

Obj-C

[self.pdfViewCtrl SetPageViewMode:e_trn_fit_width];

Reflow

Reflow document mode on iOS

Reflow makes the document more flexible and easier to read, especially on small devices. Apryse is able to extract the reflowable layout of each page of a PDF document as an HTML file. In this guide, we explain how simple it is to show a widget that allows the user to swipe left or right through the pages of the document to see reflowable document pages.

The PTReflowViewController class allows the user to flip left and right through the reflowable layout of pages in a certain PDF document.

The reflow control is part of the Tools library, so make sure you have added the Tools library to your project.

Show a reflow view controller

To create a new reflow view controller instance and display it from another view controller, supply a PTPDFViewCtrl instance to the PTReflowViewController designated initializer:

Swift

// Initialize reflow view controller with a PTPDFViewCtrl instance.
let reflowViewController = PTReflowViewController(pdfViewCtrl: pdfViewCtrl)

// Set the current view controller as the reflow view controller's delegate.
reflowViewController.delegate = self

let navigationController = UINavigationController(rootViewController: reflowViewController)
self.present(navigationController, animated: true, completion: nil)

Obj-C

// Initialize reflow view controller with a PDFViewCtrl instance.
PTReflowViewController *reflowViewController = [[PTReflowViewController alloc] initWithPDFViewCtrl:pdfViewCtrl];

// Set the current view controller as the reflow view controller's delegate.
reflowViewController.delegate = self;

UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:reflowViewController];
[self presentViewController:navigationController animated:YES completion:nil];

That is everything you need to have a simple reflow control. Next, we will go through advanced features.

Customization

It is possible to change the scale of text in the reflow view controller. The default text scale is 1.0 and can be changed with the scale property.

Similar to the PDFViewCtrl , tapping on the left or right edge of the reflow view controller can change the page. This behavior is disabled by default and can be enabled with the turnPageOnTap property.