let home = NSHomeDirectory()
print("整个应用程序各文档所在的目录:\(home)")
let document = NSHomeDirectory() + "/Documents"
print("用户文档目录:\(document)")
let library = NSHomeDirectory() + "/Library"
print("Library目录:\(library)包含Caches和Preferences")
let cache = NSHomeDirectory() + "/Library/cache"
print("缓存文件目录:\(cache)")
print("Preferences不应该直接创建文件,而是使用NSUserDefaults类获取和设置")
let temp = NSTemporaryDirectory()
print("临时文件目录:\(temp)")
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