设置系统导航栏

设置导航栏的颜色

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

//设置导航栏字体的颜色大小setTitleTextAttributes后面接字典，

[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor whiteColor]}];

//修改系统返回按钮的颜色

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

self.navigationController.navigationBar.barStyle = UIStatusBarStyleDefault;

[self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];

//隐藏返回文字

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60)

forBarMetrics:UIBarMetricsDefault];