How to truncate decimals to x places in Swift

Question

In my swift program, I have a really long decimal number (say 17.9384693864596069567) and I want to truncate the decimal to a few decimal places (so I want the

Answer 1

Drag/Drop Solution, IOS, Swift 4

Copy this code into your application...

import Foundation

func truncateDigitsAfterDecimal(number: Double, afterDecimalDigits: Int) -> Double {
   if afterDecimalDigits < 1 || afterDecimalDigits > 512 {return 0.0}
   return Double(String(format: "%.\(afterDecimalDigits)f", number))!
}

Then you can call this function like:

truncateDigitsAfterDecimal(number: 45.123456789, afterDecimalDigits: 3)

Will produce the following:

45.123