This seems like a super basic question, but I just can't seem to find the answer anywhere :-( I am able to do this in Objective C, but I am getting stuck in Swift.
What I need to do:
stringWithFormat
equivalent method (since the other string is localized as well, which is not shown in simplified examples below)How it's easily done in Objective C -- this works:
// points is of type NSNumber *
NSNumberFormatter *formatter = [NSNumberFormatter new];
formatter.locale = [NSLocale currentLocale];
formatter.numberStyle = NSNumberFormatterDecimalStyle;
NSString *ptsString = [formatter stringFromNumber:points];
NSString *message = [NSString stringWithFormat:@"You've earned %@ points", ptsString];
My best attempt at doing this in Swift -- compiler error on last line:
// points is of type Int
let formatter = NSNumberFormatter()
formatter.locale = NSLocale.currentLocale()
formatter.numberStyle = NSNumberFormatterStyle.DecimalStyle
let ptsString = formatter.stringFromNumber(points)!
let message = String(format: "You've earned %@ points", arguments: ptsString)
I'm getting the following error in Xcode on that last line:
"Cannot convert value of type 'String' to expected argument type '[CVarArgType]'"
(In my actual code, the message into which I want to insert the points value is itself localized as well, but I have simplified this example, as I'm getting the exact same error in both cases.)
What am I missing here..?
Thanks so much for any help,
Erik
You need to wrap the arguments in a collection. Like this:
let message = String(format: "You've earned %@ points", arguments: [ptsString])
You can also use this method:
let message = "You've earned \(ptsString) points"
Additionally you can create an extension method to do this:
extension String {
func format(parameters: CVarArgType...) -> String {
return String(format: self, arguments: parameters)
}
}
Now you can do this:
let message = "You've earned %@ points".format("test")
let message2params = "You've earned %@ points %@".format("test1", "test2")