Localise a String with an unknown number of arguments

Question

I have push notifications sent to the device with keys that have a value returned from Localizable.strings. The number of arguments is variable, sometimes it just needs one, sometimes it requires a few.

Normally to localise a string I would use this:

String.localizedStringWithFormat(NSLocalizedString(notification.localisedKey, comment: "a comment"), notification.localisedArguments)

However this only works if notification.localisedArguments is a single value. If it's an array, it crashes.

The workaround in iOS 10 is to use the following code:

NSString.localizedUserNotificationString(forKey: notification.localisedKey, arguments: notification.localisedArguments)

How can I make do an equivalent for iOS 9 and lower?

Related: https://stackoverflow.com/questions/42457503/how-to-properly-use-varargs-for-localizing-strings. — Martin R, Jul 14 '17 at 17:47

score 0 · Answer 1 · answered Jul 14 '17 at 17:09

0

Try this (untested):

let localizedString = NSLocalizedString(notification.localisedKey, comment: "a comment")
let result = withVaList(notification.localisedArguments) {
    String.localizedStringWithFormat(localizedString, $0)
}

answered Jul 14 '17 at 17:09

Alexander

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This gives the error "Argument type 'CVaListPointer' does not conform to expected type 'CVarArg'" for the $0 – Tometoyou Jul 14 '17 at 21:05
@Tometoyou Hmmm, try this instead https://developer.apple.com/documentation/swift/1539624-getvalist – Alexander Jul 14 '17 at 21:06
Ah solved it using some code from the link in Martin R's comment on my original post – Tometoyou Jul 14 '17 at 21:15

Localise a String with an unknown number of arguments

1 Answers1