修改导航栏属性

1、修改导航栏字体颜色

self.title = @"title";
[self.navigationController.navigationBar setTitleTextAttributes:
     @{NSFontAttributeName:[UIFont systemFontOfSize:12],
       NSForegroundColorAttributeName:[UIColor redColor]}];

2、修改导航栏背景颜色颜色

self.navigationController.navigationBar.barTintColor = [UIColor whiteColor];