Showing Doubles in Labels with AND without the decimal-point - ios

Question

To check the best answer, scroll down to Paulw11's answer.
(I apologize for any english mistakes, it's not my 1st language)
I need to solve this problem in order to continue to develop my app.
Here, I got a screenshot. (I know, it's ugly, I'm setting the constraints.)
The problem is: even when the number is a integer, it still shows as a rational. (ex.: 4 appears as 4.0, 16 as 16.0)
What I want is:
When the number in the textfield is integer, I want it to appear without the decimal-point. ( 4 appear as 4, 16 appear as 16)
When the number in the textfield is rational, I want it to appear with the decimal-point that belong to it. (4.2 appears as 4.2, 2.5 as 2.5)
What I don't want to happen:
Round any number. This will ruin the math. As I said, 4.22 needs to be 4.22 . But 4.0 needs to be only 4 .
I'll be very grateful for any help, thank you.

Answer 1

You can simply use the %g formatting option:
deltaValueS.text = String(format:"∆ é %g",deltaValue)
For 4.0 this will give "∆ é 4"
For 4.123 this will give "∆ é 4.123"

Answer 2

Do you want something like this?
let numberA: Float = 1.234
let numberB: Float = 7.000
func getStringFromNumber(number: Float) -> String {
if number - Float(Int(number)) == 0 {
return String("\(Int(number))")
} else {
return String("\(number)")
}
}
print(getStringFromNumber(numberA)) // console output: 1.234
print(getStringFromNumber(numberB)) // console output: 7