You should be able to do that through UIPageViewController-PDF
(follow full instructions from the github page, though):
NSString *path = [[NSBundle mainBundle] pathForResource:@"myFile" ofType:@"pdf"];
PageViewController *page = [[PageViewController alloc] initWithPDFAtPath:path];
[self presentViewController:page animated:YES completion:NULL];
On the other hand, Leaves should also work out of the box; if you get the sample app and replace the PDF file name that should be all.
If you cannot work it out, please, paste your code and explain in detail what does not work for you.