Quicklook/QLPreviewController shows a blank page instead of pdf on ios 8 but works fine on iOS7

Question

I am trying to preview pdf file in QLPreviewController and using the below code. It works fine on iOS7 and for other type of files (JPG/PNG) on iOS8 as well but when I try to open pdf it shows blank page instead content on iOS8. Its weird that it still shows name of pdf in title view.

Code:

QLPreviewController *previewer = [[QLPreviewController alloc] init];
previewer.dataSource = self;
previewer.currentPreviewItemIndex = 0;
[self presentViewController:previewer animated:NO completion:nil];

And QLPreviewControllerDataSource methods:

- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
    return 1;
}

- (id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    return [NSURL fileURLWithPath:self.pdfUrl];
}

Answer 1

This is actually a known issue in iOS 8 Beta 5.

See the URL under QuickLook https://developer.apple.com/library/prerelease/ios/releasenotes/General/RN-iOSSDK-8.0/