关于 导航条、状态栏的相关设置

//    导航条 变透明，去掉黑线

    [[UINavigationBar appearance] setBackgroundImage:[[UIImage alloc] init] forBarPosition:UIBarPositionAny barMetrics:UIBarMetricsDefault];

    [[UINavigationBar appearance] setShadowImage:[[UIImage alloc] init]];

//状态栏 字颜色变白 + info 设置属性View controller-based status bar appearance设为NO

    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];