Format a float value with desired numbers after the comma to a string. Doesn't display the comma if the number is a round value.

FloatToDecimalStringExtension.swift

// Format a float value with desired numbers after the comma to a string. Doesn't display the comma if the number is a round value.

import Foundation

extension Double {
	func toDecimalString(decimals: Int = 0) -> String {
		let format = (self % 1 > 0 && decimals > 0) ? "%.\(decimals)f" : "%.0f"
		return String(format:format, self)
	}
}

extension CGFloat {
	func toDecimalString(decimals: Int = 0) -> String {
		let format = (self % 1 > 0 && decimals > 0) ? "%.\(decimals)f" : "%.0f"
		return String(format:format, self)
	}
}

let chiffre: Double = 20.25000
let float: CGFloat = 99.67

print(chiffre.toDecimalString(2)) //-> 20.25
print(chiffre.toDecimalString(1)) //-> 20.2
print(chiffre.toDecimalString(0)) //-> 20
print("--------")
print(float.toDecimalString(2)) //-> 99.67
print(float.toDecimalString(1)) //-> 99.7
print(float.toDecimalString(0)) //-> 100
print(float.toDecimalString())  //-> 100