仅供记录，下次用的时候方便

获取状态栏、导航栏、tabBar高度

//获取状态栏的高度
CGFloat statusHeight = [[UIApplication sharedApplication] statusBarFrame].size.height;
NSLog(@"状态栏高度：%f",statusHeight);

//获取导航栏的高度
CGFloat navHeight = self.navigationController.navigationBar.frame.size.height;
NSLog(@"导航栏高度：%f",navHeight);

//获取tabBar的高度
 //1.在tabBarController中使用（你的继承自UITabBarController的VC）
CGFloat tabBarHeight = self.tabBar.frame.size.height;
NSLog(@"tabBar高度：%f",tabBarHeight);
//2.在非tabBarController中使用
UITabBarController *tabBarVC = [[UITabBarController alloc] init];//(这儿取你当前tabBarVC的实例)
CGFloat tabBarHeight = tabBarVC.tabBar.frame.size.height;
NSLog(@"tabBar高度：%f",tabBarHeight);

宏定义状态栏、导航栏、tabBar高度

#define kIs_iphone (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define kIs_iPhoneX kScreenWidth >=375.0f && kScreenHeight >=812.0f&& kIs_iphone

/*状态栏高度*/
#define kStatusBarHeight (CGFloat)(kIs_iPhoneX?(44.0):(20.0))
/*导航栏高度*/
#define kNavBarHeight (44)
/*状态栏和导航栏总高度*/
#define kNavBarAndStatusBarHeight (CGFloat)(kIs_iPhoneX?(88.0):(64.0))
/*TabBar高度*/
#define kTabBarHeight (CGFloat)(kIs_iPhoneX?(49.0 + 34.0):(49.0))
/*顶部安全区域远离高度*/
#define kTopBarSafeHeight (CGFloat)(kIs_iPhoneX?(44.0):(0))
 /*底部安全区域远离高度*/
#define kBottomSafeHeight (CGFloat)(kIs_iPhoneX?(34.0):(0))
/*iPhoneX的状态栏高度差值*/
#define kTopBarDifHeight (CGFloat)(kIs_iPhoneX?(24.0):(0))
/*导航条和Tabbar总高度*/
#define kNavAndTabHeight (kNavBarAndStatusBarHeight + kTabBarHeight)

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