Swift NSUserDefaults是否已经有键和值对-敏捷的

我正在应用程序中使用NSUserDefaults，启动应用程序时，NSUserDefaults似乎已经具有默认值。当我将应用程序开头的NSUserDefaults打印为字典时，它具有默认值。这就是将其打印为字典的方式：

[MSVLoggingMasterSwitchEnabledKey: 0, NSLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
), AppleITunesStoreItemKinds: (
audiobook,
"tv-episode",
booklet,
software,
"software-update",
"itunes-u",
ringtone,
"tv-season",
movie,
mix,
newsstand,
song,
wemix,
tone,
artist,
"podcast-episode",
podcast,
document,
eBook,
album,
"music-video"
), AppleKeyboardsExpanded: 1, NSInterfaceStyle: macintosh, AppleKeyboards: (
"en_US@hw=US;sw=QWERTY",
"emoji@sw=Emoji",
"en_US@hw=US;sw=QWERTY"
), AppleLocale: en_US, AppleLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
)]
[MSVLoggingMasterSwitchEnabledKey: 0, NSLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
), AppleITunesStoreItemKinds: (
audiobook,
"tv-episode",
booklet,
software,
"software-update",
"itunes-u",
ringtone,
"tv-season",
movie,
mix,
newsstand,
song,
wemix,
tone,
artist,
"podcast-episode",
podcast,
document,
eBook,
album,
"music-video"
), AppleKeyboardsExpanded: 1, NSInterfaceStyle: macintosh,        
AppleKeyboards: (
"en_US@hw=US;sw=QWERTY",
"emoji@sw=Emoji",
"en_US@hw=US;sw=QWERTY"
), AppleLocale: en_US, AppleLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
)]
[MSVLoggingMasterSwitchEnabledKey: 0, NSLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
), AppleITunesStoreItemKinds: (
audiobook,
"tv-episode",
booklet,
software,
"software-update",
"itunes-u",
ringtone,
"tv-season",
movie,
mix,
newsstand,
song,
wemix,
tone,
artist,
"podcast-episode",
podcast,
document,
eBook,
album,
"music-video"
), AppleKeyboardsExpanded: 1, NSInterfaceStyle: macintosh,    
AppleKeyboards: (
"en_US@hw=US;sw=QWERTY",
"emoji@sw=Emoji",
"en_US@hw=US;sw=QWERTY"
), AppleLocale: en_US, AppleLanguages: (
en,
fr,
de,
"zh-Hans",
"zh-Hant",
ja,
nl,
it,
es,
"es-MX",
ko,
pt,
"pt-PT",
da,
fi,
nb,
sv,
ru,
pl,
tr,
uk,
ar,
hr,
cs,
el,
he,
ro,
sk,
th,
id,
ms,
"en-GB",
"en-AU",
ca,
hu,
vi,
hi
)]

---

是的，对于语言，有一些预设值。正如您所指出的，您粘贴的项目是语言。甚至引号中的“zh Hans”也指语言，在这里指的是汉语的不同方言

---

需要注意的是，“NSLanguages默认值用于设置用于本地化的常量。”

那么我如何启动没有默认值的NSUserDefaults？user3798602，正如gnustep.org所述，NSLanguages默认值用于设置用于本地化的常量。我们没有能力阻止这部分事情。然而，如果不进行本地化，我们可以忽略它们。如果你想让你自己的应用有一个“新的开始”，你可以列出你的应用使用的默认设置。然后您可以在代码中运行它们，并将它们全部设置为null或调零值。这将有效地为您提供“否”默认值。