objective c - How to change leftBarbuttonItem title? -

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i want change leftbarbutton title. i've tried 

uibarbuttonitem *newbackbutton = [[uibarbuttonitem alloc] initwithtitle:@"back"                                  style:uibarbuttonitemstylebordered                                 target:nil                                 action:nil]; [[self navigationitem] setleftbarbuttonitem:newbackbutton];

but brings changes

enter image description here

but want

enter image description here

how can possible?

it may helpful 

      uibarbuttonitem *backbarbutton = [[uibarbuttonitem alloc] initwithtitle:@"back" style:uibarbuttonitemstyledone target:self action:@selector(backaction:)];       self.navigationitem.leftbarbuttonitem = backbarbutton;

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