How can I pad an integer on the left with zeros?

Question

I have the following variable:

NSNumber *consumption = [dict objectForKey:@\"con\"];

Which returns 42. How can I pad this number to 10 dig

Answer 1

Solution for Swift 3

let x = 1078.1243
let numFormatter = NumberFormatter()
numFormatter.minimumFractionDigits = 1 // for float
numFormatter.maximumFractionDigits = 1 // for float
numFormatter.minimumIntegerDigits = 10 // how many digits do want before decimal
numFormatter.paddingPosition = .beforePrefix
numFormatter.paddingCharacter = "0"

let s = numFormatter.string(from: NSNumber(floatLiteral: x))!

OUTPUT

"0000001078.1"