ios - Changing Nav Bar title programatically -


i'm trying change nav bar's title programatically code i'm using won't work. 

self.navigationcontroller.navigationbar.tintcolor = [uicolor redcolor]; self.navigationcontroller.navigationitem.title=@"hello";

i can manage change colour of bar not text, have ideas/ solution? 

self.navigationcontroller.navigationbar.topitem.title = @"yourtitle";

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