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How do I format localized strings in Swift?

I am learning to localize my application in Simplified Chinese. I am following this tutorial on how to do this.

Since the tutorial is based on Obj-C, the formatted strings can be written like this:

"Yesterday you sold %@ apps" = "Ayer le vendió %@ aplicaciones";

"You like?" = "~ Es bueno? ~";

But I am using Swift. And in Swift I don't think you can use %@

to indicate that there is something in there. Do we have correct string interpolation?

My application is related to mathematics. And I want to show what input is used to calculate the result in the detailed cell label of the table view. for example

--------------
1234.5678
From x, y <---- Here is the detailed label
--------------

Here From x, y

means "The result is calculated from x and y". I want to translate this into Chinese:

从 x, y 得出

Until then, I can just use this:

"From \(someVariable)"

with a file of lines:

"From" = "从 得出";

And this is how I will use it in code

"\(NSLocalizedString("From", comment: "")) \(someVariable)"

But if this were used in the Chinese version, the final line would be:

"从 得出 x, y"

I mean, I can put 从

and 得出

in two different entries in the line file. But is there a better way to do this?

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3 answers


You can use %@

in Swift String(format:...)

, it can be replaced with Swift String

or any instance of a subclass NSObject

. For example, if the Localizable.strings file contains the definition

"From %@, %@" = "从 %@, %@ 得出";

then

let x = 1.2
let y = 2.4
let text = String(format: NSLocalizedString("From %@, %@", comment: ""), "\(x)", "\(y)")
// Or alternatively:
let text = String(format: NSLocalizedString("From %@, %@", comment: ""), NSNumber(double: x), NSNumber(double: y))

produces "从 1.2, 2.4 得出". Another option would be to use %f

for double floating point numbers:



"From %f, %f" = "从 %f, %f 得出";

from

let text = String(format: NSLocalizedString("From %f, %f", comment: ""), x, y)

See Niklas' answer for an even better solution that localizes the numeric representation as well.

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From WWDC 2017 :



let format = NSLocalizedString("%d popular languages", comment:"Number of popular languages")
label.text = String.localizedStringWithFormat(format, popularLanguages.count)
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In object C, if we want lines added at runtime like below

John Appleseed is the name

YourLocalizable.strings

"theStringToDisplay" = "%@ is the name";

ViewController.m

NSString *username = @"John Appleseed";
NSString *messageBeforeFormat = NSLocalizedStringFromTable(@"theStringToDisplay", @"YourLocalizable", nil);
NSString *messageAfterFormat = [NSString stringWithFormat:messageBeforeFormat, username ];

self.yourLabel.text = messageAfterFormat;

Further explanation in this nice post

https://www.oneskyapp.com/academy/learn-ios-localization/2-format-strings-plurals/

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