我今天遇到了一系列autoconf宏：https://www.gnu.org/software/autoconf-archive/The-Macros.html#The-Macros。所有都以ax_为前缀，例如ax_ac_append_to_file.m4，configure.ac已在AX_ABSOLUTE_HEADER()中激活，其中包含行AC_。
过去，我只看到以AX_开头的宏。
切换到if currentArea != "Somewhere" {
if gettingContent == false && objectsArray.count == 0 {
if firstOfLocalLeaderboard != nil {
if indexPath.row == 0 {
let vc = self.storyboard!.instantiateViewController(withIdentifier: "TopTenAreaController") as! TopTenAreaController
vc.area = currentArea
let navVC = UINavigationController()
navVC.viewControllers = [vc]
self.present(navVC, animated: true, completion: nil)
}
else if indexPath.row == 1 {
if localLeaderboard.count > 0 {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "PhotoViewController") as! PhotoViewController
vc.objectsArray = localLeaderboard
vc.currentArea = currentArea
let navVC = UINavigationController()
navVC.viewControllers = [vc]
self.present(navVC, animated: true, completion: nil)
}
else {
let vc = self.storyboard!.instantiateViewController(withIdentifier: "CameraViewController") as! CameraViewController
vc.appearedFromHome = true
let navVC = UINavigationController()
navVC.viewControllers = [vc]
self.present(navVC, animated: true, completion: nil)
}
}
}
else {
if indexPath.row == 0 {
if localLeaderboard.count > 0 {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "PhotoViewController") as! PhotoViewController
vc.objectsArray = localLeaderboard
vc.currentArea = currentArea
let navVC = UINavigationController()
navVC.viewControllers = [vc]
self.present(navVC, animated: true, completion: nil)
}
else {
let vc = self.storyboard!.instantiateViewController(withIdentifier: "CameraViewController") as! CameraViewController
vc.appearedFromHome = true
let navVC = UINavigationController()
navVC.viewControllers = [vc]
self.present(navVC, animated: true, completion: nil)
}
}
}
}
是一个相对较新的约定，一种避免命名空间冲突的方法，还是别的什么？
答案 0 :(得分：2)
宏是命名空间。 AC_是指来自Autoconf的宏，AM_是Automake，LT_是Libtool等。
过去，提供宏的其他程序在Autoconf的命名空间中占据一席之地是很常见的，这就是为什么你可能已经看到了AX_宏的一些AC_宏的变体。{{ 1}}前缀。