I want to customize the navigation bar of QLPreviewcontroller but instead of many solutions for this none of them worked for me. If I am sub-classing the QLPreviewcontroller then I am not able to set its data source to current controller and even not able to push it.
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Please read [Under what circumstances may I add “urgent” or other similar phrases to my question, in order to obtain faster answers?](//meta.stackoverflow.com/q/326569) - the summary is that this is not an ideal way to address volunteers, and is probably counterproductive to obtaining answers. Please refrain from adding this to your questions. – halfer Aug 14 '17 at 14:43
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What part are you wanting/trying to customize? What do you mean by "I am not able to set its data source to current controller and even not able to push it: i've used `QLPreviewController`, I made a custom VC that subclassed `QLPreviewController` that I added as a childVC using, `.didMove(toParentViewController:)` – Jacob Boyd Aug 14 '17 at 15:43
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when i am trying to push this controller through self.navigationController.pushViewcontroller then it gets crashed with EXC_BAD_ACCESS – cherry_4 Aug 15 '17 at 12:08