//设置导航栏信号区颜色
配置信息如下图:View controller-based status bar appearance
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
//设置导航栏背景色(分类方法)
[self.navigationController.navigationBar st_setBackgroundColor:[AppColor colorWithAlphaComponent:1]];
//设置导航栏字体颜色
[self.navigationController.navigationBar setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor whiteColor]}];
//自动布局 距离导航栏的高度
make.top.mas_equalTo(self.mas_topLayoutGuide).mas_offset(20);