Section:

Add a new PDF Layer on iOS

To add a PDF layer or OCG (optional content group) to a new document.

1PTPDFDoc *doc = [[PTPDFDoc alloc] init];
2PTElementBuilder *builder = [[PTElementBuilder alloc] init];	// ElementBuilder is used to build new Element objects
3PTElementWriter *writer= [[PTElementWriter alloc] init];	// ElementWriter is used to write Elements to the page
4
5// Create a layer
6PTGroup *image_layer = [PTGroup Create: doc name: @"Image Layer"];
7PTConfig *cfg = [PTConfig Create: doc default_config: YES];
8[cfg SetName: @"Default"];
9
10// Add the new OCG to the list of layers that should appear in PDF viewer GUI.
11PTObj *layer_order_array = [doc CreateIndirectArray];
12[cfg SetOrder: layer_order_array];
13[layer_order_array PushBack: [image_layer GetSDFObj]];
14
15// Start a new page
16PTPage *page = [doc PageCreate: [[PTPDFRect alloc] initWithX1: 0 y1: 0 x2: 612 y2:792]];
17[writer WriterBeginWithPage: page placement: e_ptoverlay page_coord_sys: YES compress: YES]; // Begin writing to the page
18
19// Add new content to the page and associate it with one of the layers.
20PTImage *img = [PTImage Create: [doc GetSDFDoc] filename: imagename];
21[[img GetSDFObj] Put: @"OC" obj: image_layer];
22[writer WritePlacedElement: [builder CreateImageWithCornerAndScale: img x: 300 y: 600 hscale: 200 vscale: -150]];
23[writer End];   // save changes to the current page
24[doc PagePushBack: page];

PDF layers (OCG)
Full sample code which demonstrates how to create, extract, render PDF layers.

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