基础知识

iOS 宏定义-获取状态栏、导航栏、tabBar高度

https://www.jianshu.com/p/801bdea428f8

let screenHeight = UIScreen.main.bounds.size.height
let statusBarHeight = UIApplication.shared.statusBarFrame.size.height
let navigationBarHeight = self.navigationController?.navigationBar.frame.size.height ?? 0
let tabbarHeight = self.tabBarController?.tabBar.frame.height ?? 0
let screenWidth = UIScreen.main.bounds.size.width
let iphoneX = screenWidth >= 375.0 && screenHeight >= 812.0
let bottomGuideHeight: CGFloat = iphoneX ? 34 : 0