//设置导航栏baritem和返回baiitem样式

UIBarButtonItem *barItem = [UIBarButtonItem appearance];

//去掉返回按钮上的字

[barItem setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)

forBarMetrics:UIBarMetricsDefault];

//把按钮设置为白色

barItem.tintColor = [UIColor whiteColor];

UINavigationBar *navBar = [UINavigationBar appearance];

//设置导航栏 字体颜色

[navBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];//设置导航栏标题颜色

[navBar setBarTintColor:[UIColor blueColor]];//设置导航栏背景色

navBar.tintColor = [UIColor whiteColor];//设置导航栏返回按钮颜色

appdelegate设置

//设置全局状态栏字体的颜色

application.statusBarStyle = UIStatusBarStyleLightContent;