Accessing the Temperature Unit setting in iOS 10

In iOS 10 Apple added a new dedicated setting for Temperature Unit in the Settings.app under General > Language & Region > Temperature Unit . It lets you switch your preferred unit between Fahrenheit and Celsius:

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Sadly Apple did not provide a public API for third party apps. Here is how you can access this preference in your app:

1. You first need to expose the NSLocaleTemperatureUnit NSLocaleKey:

FOUNDATION_EXPORT NSLocaleKey const NSLocaleTemperatureUnit;

2. You can now print the temperature unit. The value is one of these 2 strings: Celsius or Fahrenheit.

NSLog(@"NSLocaleTemperatureUnit value: %@", [[NSLocale currentLocale] objectForKey:NSLocaleTemperatureUnit]);