导航栏的一些全局配置

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(NSIntegerMin, NSIntegerMin) forBarMetrics:UIBarMetricsDefault];//清空返回按钮显示上一级标题，导致侧滑时出现标题显示错乱

[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:NO];//状态栏背景颜色配置

//导航栏全透明

self.navigationController.navigationBar.translucent = NO;

[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

self.navigationController.navigationBar.shadowImage = [UIImage new];

//隐藏导航栏，push出现黑色阴影解决

[self.navigationController setNavigationBarHidden:YES animated:YES];//在viewWillAppear中使用

[self.navigationController setNavigationBarHidden:NO animated:NO];//在viewWillDisappear中使用