How to autobox a primitive literal? - objective-c

Question

Previously in Objective-C, I would be able to do something like:
NSInteger count = 100;
NSString *text = [NSString stringWithFormat:#"count: %#", #(count)];
Objective-C had introduced the concept of autoboxing primitive literals so I didn't have to deal with %d, %ld, etc. It'll automatically convert the primitive literal into an NSObject which the formatter to parse as a %#.
In swift, is there something similar we can do?
let count: Int = 100
let text = String.init(format: "count of %#", count)
The above crashes because count is not a pointer to an object.
I know I can do inline parameter injection like:
let text = "count of \(count)"
But due to localization purposes, localizing the string format needs to happen before updating the parameters, which the code immediately above can't do.

Answer 1

Use Foundation types and bridge to NSNumber?
let count1: NSNumber = 100 // 100
let count2: NSNumber = 0.0 // 0
let count3: NSNumber = 2.73 // 2.73
let text = String(format: "count of %# %# %#", count1, count2, count3) // "count of 100 0 2.73"
That's really what "autoboxing" does, it wraps a primitive type in an Objective-C NSNumber object.

Answer 2

Doesn't quite answer the question, but I worked around the problem by wrapping my parameter with String(…), e.g.
let count: Int = 100
let text = String.init(format: "count of %#", String(count))
Update: an equivalent implementation to the above:
let count: Int = 100
let text = String.init(format: "count of %#", "\(count)")

Answer 3

Here's how I usually accomplish this: I just use a placeholder for the localization and swap it out after. So my strings files would look like this:
//English
"Could not read <name>" = "Could not read <name>."
//Spanish
"Could not read <name>" = "No puede leer <name>."
And my code would look like this:
//assume you have a fileName variable
var localizedString = NSLocalizedString("Error reading <name>", comment: "Error message when an object could not be read.")
localizedString = localizedString.replacingOccurrences(of: "<name>" with: fileName)
Instead of using an already-localized fileName, as I have in my example above, you could easily swap the placeholder for something like "\(count)". Just make sure that you localize the dropped-in value so that it displays nicely when put together with the text.