swift - Unprintable ASCII character found in source file - encode

Question

This code:
var str = "ぴ" //Japanese: pi
xcode report compilation error:
Unprintable ASCII character found in source file

Answer 1

Have you tried this?
func convertString(string: String) -> String {
var data = string.dataUsingEncoding(NSASCIIStringEncoding, allowLossyConversion: true)
return NSString(data: data!, encoding: NSASCIIStringEncoding) as! String
}
From How to deal with a user input string that gives an "unprintable ascii character found in source file" error when pasted into Xcode?

Answer 2

This answer is for the people who are using windows keyboard with mac system.
While typing you might have unknowingly clicked the right-click key in your keyboard, which will create the Unprintable ASCII character that is causing the Unprintable ASCII character found in the source file error.
To check this go to find（cmd+F） and click the right-click key and you can find them in your class and delete those characters and the error will be gone.
Thanks

Answer 3

SWIFT 4:
func convertString(string: String) -> String {
let data = string.data(using: String.Encoding.ascii, allowLossyConversion: true)
return NSString(data: data!, encoding: String.Encoding.ascii.rawValue)! as String
}

Answer 4

In a Playground your line won't give you an error as it is, since it uses UTF-8 encoding by default. In a regular project your trusty File inspector will allow you to define the Text Encoding in the Text Settings section. I recommend to use some version of Unicode, probably UTF-8 if your app will deal primarily with western languages and UTF-16 if you have a lot of text constants in asian languages.
This just for the record since this is an old question and you probably found a working solution years ago.