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

Question

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

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

Answer 1

here's a swift version

var locale = NSLocale.currentLocale()
let isMetric = locale.objectForKey(NSLocaleUsesMetricSystem) as! Bool