Rotating a PDF page on iOS

To rotate a page in a PDF document.

PTPDFDoc *doc = [[PTPDFDoc alloc] initWithFilepath: filename];

// Rotate the first page 90 degrees clockwise.
PTPage *page = [doc GetPage:1];
PTRotate originalRotation = [page getRotation];
PTRotate rotation;
switch (originalRotation)
{
  case e_pt0:   rotation = e_pt90;  break;
  case e_pt90:  rotation = e_pt180; break;
  case e_pt180: rotation = e_pt270; break;
  case e_pt270: rotation = e_pt0;   break;
  default:      rotation = e_pt0;   break;
}
[page SetRotation: rotation];

A page can be rotated clockwise, by 90 degrees, when displayed or printed. The Page.GetRotation() method returns the Page.Rotate enum specifying the current rotation. Similarly, Page.SetRotation() sets the current rotation.