How to use appendFormat to format a string in Swift?

Question

I want to append a string to a NSMutableString using appendFormat, inserting white spaces to get a minimum length for my string.

In objective-c, i just used

[text.mutableString appendFormat:@"%-12s", "MyString"];

and I would get

"MyString    "

But in Swift, I tried

text.mutableString.appendFormat("%-12s", "MyString")

and I get everything, but not "MyString ". It appears some random characters that I do not know where it came from.

Is there anyone who knows why that happens, and what I should do?

Thank you guys!

Answer 1

You should use String's method stringByPaddingToLength() as follow:

let anyString = "MyString"
let padedString = anyString.stringByPaddingToLength(12, withString: " ", startingAtIndex: 0)  // "MyString    "