您可以将其保存到应用程序支持文件夹中以bundleID命名的子目录文件夹,也可以将其保存到库目录中的preferences文件夹:
let preferencesDirectoryURL = FileManager.default.urls(for: .libraryDirectory, in: .userDomainMask).first!.appendingPathComponent("Preferences", isDirectory: true)
let fileURL = preferencesDirectoryURL.appendingPathComponent("fileName.plist")
print(fileURL.path) // "/var/folders/.../Library/Preferences/fileName.plist