Navigation bar is having a strange behaviour I am hiding it using storyboard and programmatically but it still appears....

1-Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named UINavigationBarAppearance because no class named UINavigationBarAppearance was found; the class needs to be defined in source code or linked in from a library (ensure the class is part of the correct target)' terminating with uncaught exception of type NSException 2-Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named UITabBarAppearance because no class named UITabBarAppearance was found; the class needs to be defined in source code or linked in from a library (ensure the class is part of the correct target)'

I have to convert image to 8 bit per pixel and component as i have tried to convert it but I got 24 bit per pixel in return ..

I am working on image processing where I have to convert the UIImage to (8 bit 3 channel) and (8 bit 1 channel) in iOS ... I am looking for tutorial over internet but could not find that

I want to achieve to achieve similar thing appeared in images user paint over the area which he wants to select and then masking the image similar like this

I am bit of curious after a lot of research I could not find any library related to image inPainting .....is there any library which I can use for image inPainting e.g to remove object from image etc thanks

I have developed Qr/Doc scanner app which is working fine on all devices but apple rejected it saying crashed on launch .I'm unable to identify what's causing the crash Crash report 1 crash report 2