我可以使用 [NSTimeZone knownTimeZoneNames] 获得时区列表，但这只会给出包含每个时区中的一两个城市的时区 ID.
I can get a list of time zones with [NSTimeZone knownTimeZoneNames], but that only gives the time zone IDs which include one or two cities in each time zone.
日期和时间时间设置有一个很棒的城市列表，我还看到其他一些应用程序具有相同的查找列表(如果不相似的话).
The Date & Time settings has a great list of cities and I have seen a few other apps that have the same if not similar lookup lists.
这些列表来自哪里?
我确实需要将所选城市与其时区相关联，例如 Date &时间会.
I do need to relate a picked city to its time zone like Date & Time does.
只有2个?在 3.1 中，[NSTimeZone knownTimeZoneNames] 返回一个包含 401 个元素的数组，而地球上的时区远少于 200 个.
Only 2? On 3.1 the [NSTimeZone knownTimeZoneNames] returns an array of 401 elements, and there are much less than 200 timezones on the Earth.
我很确定其他应用程序"也使用 +knownTimeZoneNames，因为这是返回此类列表的唯一公共方法.不过，请确保您的代码是正确的.
I'm pretty sure "other apps" use +knownTimeZoneNames as well, since this is the only public method returning such list. Please make sure your code is correct, though.
Settings.app 使用 private private AppSupport.framework 中的 noreferrer">CPCity API.它确实有旧金山，但它是私人的.
Settings.app uses the private CPCity API from the private AppSupport.framework. It does have San Francisco, but it's private.
您需要创建自己的数据库(数据可以从/System/Library/PrivateFrameworks/AppSupport.framework/all_cities_adj.plist复制).
You need to create your own database (the data can be copied from /System/Library/PrivateFrameworks/AppSupport.framework/all_cities_adj.plist).
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