导航条及状态栏的设置

// 修改导航条背景色

 [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:234/255.0 green:93/255.0 blue:13/255.0 alpha:1]];

// 修改导航条上字体颜色及大小

self.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor],NSFontAttributeName : [UIFont boldSystemFontOfSize:18]};

// 修改状态栏字体颜色

 [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent];
// 需要在plist文件中添加字段
View controller-based status bar appearance 类型为bool 值 设为no