iOS修改导航栏字体颜色

self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor colorWithRed:98/255.0 green:204/255.0 blue:192/255.0 alpha:1.0],NSFontAttributeName : [UIFont boldSystemFontOfSize:18]};

self.navigationItem.rightBarButtonItem.tintColor = [UIColor blackColor];
self.navigationItem.leftBarButtonItem.tintColor = [UIColor blackColor];