iOS 导航栏标题及背景颜色

标题自定义样式：

NSDictionary *titleAttriDic = [NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];
self.navigationController.navigationBar.titleTextAttributes = titleAttriDic;
self.navigationItem.title = @"我是标题";

导航栏底色：

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