我怎么知道iOS上默认的度量系统(英制或公制)? [英] How do I know which is the default measure system (imperial or metric) on iOS?

问题描述

我怎么知道iOS上默认的度量系统(英制或公制)?

How do I know which is the default measure system (imperial or metric) on iOS ?

如何从设备设置中获得此首选项，以便知道在应用程序中显示什么?

How do I get this preference from the device settings, so I know what to display in my app ?

谢谢

推荐答案

NSLocale可以告诉您:

NSLocale *locale = [NSLocale currentLocale]; 
BOOL isMetric = [[locale objectForKey:NSLocaleUsesMetricSystem] boolValue];

只有三个国家不使用公制:美国，利比里亚和缅甸.后者使用自己的系统，前两个使用英制.

Only three countries do not use the metric system: the US, Liberia and Myanmar. The later uses its own system, the former two use Imperial Units.

Apple文档说(重点是我):

Apples documentation says (emphasis mine):

NSLocaleUsesMetricSystem

用于指示语言环境是否使用公制的标志的键. 对应的值是布尔值NSNumber对象. 如果该值为NO，则通常可以采用美国的度量单位(例如，法定英里).

The key for the flag that indicates whether the locale uses the metric system. The corresponding value is a Boolean NSNumber object. If the value is NO, you can typically assume American measurement units (for example, the statute mile).

在iOS 2.0和更高版本中可用.

Available in iOS 2.0 and later.

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