[objc] UINavigationContorller 설정 버튼

UIBarButtonItem *btn = ..

btn.title = @"\u2699"; 

UIFont *f1 = [UIFont fontWithName:@"Helvetica" size:24.0]; 

NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:f1, UITextAttributeFont, nil]; 

[btn setTitleTextAttributes:dict forState:UIControlStateNormal];

http://stackoverflow.com/questions/9755154/ios-uibarbuttonitem-identifier-option-to-create-settings-cogwheel-button