1、先获取状态栏的高度
// 状态栏(statusbar)
CGRect rectStatus = [[UIApplication sharedApplication] statusBarFrame];
NSLog(@"status width - %f", rectStatus.size.width); // 宽度
NSLog(@"status height - %f", rectStatus.size.height); // 高度
// 导航栏（navigationbar）+ 状态栏 高度的宏定义
#define Nav_Height ([[UIApplication sharedApplication] statusBarFrame].size.height + self.navigationController.navigationBar.frame.size.height)
tabBar的高度
#define TabBar_Height self.tabBarController.tabBar.frame.size.height
自定义状态栏
UIView*statusBarView = [[UIView alloc] initWithFrame:CGRectMake(0, -20,SCREEN_WIDTH, rectNav.size.height)];
statusBarView.backgroundColor= [UIColor redColor];
[self.navigationController.navigationBar addSubview:statusBarView];
