ios - dynamically set navigation controller title -

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i'm working core data, , part of app very similar default contacts app. there edit screen after contact in core data, , make title: [insert contact name here] s information". know can set title core data entity attribute doing: self.navigationcontroller.title = _athletesfullname; (property attribute under entity "athlete"). there way can 

self.navigationcontroller.title = @"%@'s information",_athletesfullname; ?

try code:

 self.navigationcontroller.navigationitem.title=[nsstring stringwithformat:@"%@ 's information",_athletesfullname];

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