Question 68482 in IOS Swift Question posted in
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Swift -Increase Float Value – Ios swift

I have a UISlider that has min value of 0 and a max value of 1.

When it stops it can be any number such as

3.2990444444444442

In this situation I want to increase the last number to a 3 as in

3.2990444444444443

But since it’s a slider, I’ll never know the exact number until it stops, so the number might be

0.0019881635 at which I would want to increase to 0.0019881636 or 0.999 to 1.0

How can I do this?

If it’s not clear what I want to do, no matter what the last digit is in the slider decimal value, I need to increase it by 1

A lot of the answers that I came across are in another language, not Swift

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2

Answers


  1. 0

    Consider this solution:

    extension Float {
func decimalCount() -> Int {
    if self == Float(Int(self)) {
        return 0
    }

    let integerString = String(Int(self))
    let doubleString = String(self)
    let decimalCount = doubleString.count - integerString.count - 1

    return decimalCount
}

mutating func increaseLast(){
    let powerfactor = pow(10, Float(decimalCount()))
    self = (self * powerfactor + 1) / powerfactor
    
 }
}

    I didn´t test this thoroughly but it should work. Got the function decimalcount from this so answer

    Usage example:

    let array: [Float] = [0.999, 0.0004, 0.004, 0.009]

array.forEach{
  var a = $0
  a.increaseLast()
  print($0)
  print(a)
}

    prints:

    0.999
1.0
0.0004
0.0005
0.004
0.005
0.009
0.01
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  2. 0

    nextUp returns the next Float value greater than the given value.

    Note that if the slider is set to 1, it will return a value greater than 1, so you may want to clamp that value.

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