Add highlight annotation to a PDF on iOS

To add a highlight annotation to a PDF Document page.

PTPDFDoc *doc = [[PTPDFDoc alloc] initWithFilepath: filename];
PTPage *page = [doc GetPage:1];

// Create a highlight
PTHighlightAnnot *hl = [PTHighlightAnnot Create: [doc GetSDFDoc] pos: [[PTPDFRect alloc] initWithX1: 100 y1: 490 x2: 150 y2: 515]];
[hl SetColor: [[PTColorPt alloc] initWithX: 0 y: 1 z: 0 w: 0] numcomp: 3];
[hl RefreshAppearance];
[page AnnotPushBack: hl];

Add or edit PDF annotations sample
Full code sample which shows how to add or edit PDF annotations (e.g. hyperlink, intra-document link, stamp, rubber stamp, file attachment, sound, text, free-text, line, circle, square, polygon, polyline, highlight, squiggly, caret, and ink).