Uppercase All String According to Locale - Swift

NSLocale.currentLocale() is the locale which was selected in the Settings of the device. If that is "en_US" then

text.uppercaseStringWithLocale(NSLocale.currentLocale())

will use the english language rules and the result is "ISTANBUL, IZMIR".

You can either select the turkish language in the device settings, or specify the turkish locale explicitly:

let text = "istanbul, izmir"
text.uppercaseStringWithLocale(NSLocale(localeIdentifier: "tr"))
// İSTANBUL, İZMİR

Swift 3:

text.uppercased(with: Locale(identifier: "tr"))

If you want to use the current locale, you can use:

text.localizedUppercaseString

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