I have finished my project in Xcode 6. Tested on simulator. Everything works fine. So installed app on my hardware. (iPhone 5 ) however looks like prepare for segue and unwind to segue methods does not get called. Due to this properties I set in these methods stays nil. And so app crashed. Please help.
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I managed to crack it. Problem was declaration of property in .h file for NSString. It was declared weak. Changing it to strong sorted my problem.

user2511630
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