如何在Swift中获取小数位数并加1？

import Foundation

func getDecimalDigitsAndIncrement(number: Double) -> Int? {
    let formatter = NumberFormatter()
    formatter.numberStyle = .decimal
    formatter.maximumFractionDigits = 2
    
    if let formattedString = formatter.string(from: NSNumber(value: number)) {
        if let decimalSeparator = formatter.decimalSeparator {
            let components = formattedString.components(separatedBy: decimalSeparator)
            if components.count > 1 {
                if let decimalDigits = Int(components[1]) {
                    return decimalDigits + 1
                }
            }
        }
    }
    
    return nil
}

let number = 3.14159
if let decimalDigits = getDecimalDigitsAndIncrement(number: number) {
    print("Number of decimal digits: \(decimalDigits)")
} else {
    print("Failed to retrieve decimal digits")
}