导航栏按钮

 //导航栏按钮
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"完成"
                                                                   style:UIBarButtonItemStylePlain
                                                                  target:self
                                                                  action:@selector(done)];
    self.navigationItem.rightBarButtonItem = doneButton;
    UIBarButtonItem *cancleButton = [[UIBarButtonItem alloc] initWithTitle:@"取消"
                                                                     style:UIBarButtonItemStylePlain
                                                                    target:self
                                                                    action:@selector(cancle)];
    self.navigationItem.leftBarButtonItem = cancleButton;
    self.navigationItem.leftBarButtonItem.tintColor = [UIColor blackColor];
    self.navigationItem.rightBarButtonItem.tintColor =  [UIColor  whitecolor];

　　

导航栏字体颜色大小设置

http://stackoverflow.com/questions/5832036/change-the-navigation-bars-font

http://stackoverflow.com/questions/8774531/change-uinavigationbar-font-properties/12364740#12364740