Padding a swift String for printing

Question

I\'m trying to print a list of Strings all padded to the same width.

In C, I would use something like printf(\"%40s\", cstr), where cstr is a C string.<

Answer 1

Put all string-format-code into extension and reuse it wherever you want.

extension String {
    func padding(length: Int) -> String {
        return self.stringByPaddingToLength(length, withString: " ", startingAtIndex: 0)
    }

    func padding(length: Int, paddingString: String) -> String {
        return self.stringByPaddingToLength(length, withString: paddingString, startingAtIndex: 0)
    }
}

var str = "str"
print(str.padding(10)) // "str       "
print(str.padding(10, paddingString: "+")) // "str+++++++"