How do I know which is the default measure system (imperial or metric) on iOS?
The NSLocale can tell you:
NSLocale *locale = [NSLocale currentLocale]; BOOL isMetric = [[locale objectForKey:NSLocaleUsesMetricSystem] boolValue];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.
Apples documentation says (emphasis mine):
NSLocaleUsesMetricSystemThe 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).
Available in iOS 2.0 and later.
@DarkDust answer for swift3
//User region setting returnlet locale = Locale.current //NSLocale.current//Returns true if the locale uses the metric system let isMetric = locale.usesMetricSystem
here's a swift version
var locale = NSLocale.currentLocale()let isMetric = locale.objectForKey(NSLocaleUsesMetricSystem) as! Bool