余剰計算　エラーが取れません

前提・実現したいこと

電卓アプリの小数点以下が０の時に小数点以下を切り捨てる処理をしたいです。
まず、計算結果が少数を含む場合を考えています

発生している問題・エラーメッセージ

'%' is unavailable: For floating point numbers use truncatingRemainder instead

該当のソースコード

        let isIntegerP = floor(previousNumver) == previousNumver
        let isIntegerN = floor(numberOnScreen) == numberOnScreen
        
        if previousNumver % numberOnScreen != 0 || isIntegerP == false || isIntegerN == false {
        
            result.text = String(format:"%.0f",result.text ?? 0 )

以下コード全文

import UIKit
import Foundation

class ViewController: UIViewController {

var numberOnScreen:Double = 0;
var previousNumver:Double = 0;
var performingMath:Bool = false
var operation = 0;



@IBOutlet weak var formula: UILabel!
@IBOutlet weak var result: UILabel!

@IBOutlet weak var buttonA: UIButton!


@IBAction func numbers(_ sender: UIButton) {
    
    
    if performingMath == true {
        switch (sender.tag) {
        case 1...10:
            result.text = String(sender.tag-1)
            formula.text! += String(sender.tag-1)
            numberOnScreen = Double(result.text!)!
            performingMath = false
        default:
            formula.text! += "."
            result.text! += "."
            buttonA.isEnabled = false
            
        }
    } else {
        switch (sender.tag) {
        case 1...10:
            result.text! += String(sender.tag-1)
            formula.text! += String(sender.tag-1)
            numberOnScreen = Double(result.text!)!
        default:
            formula.text! += "."
            result.text! += "."
            buttonA.isEnabled = false
        }
        
    }
    
}
@IBAction func root(_ sender: UIButton) {
    if formula.text != "" && sender.tag != 11 && sender.tag != 16 {
        previousNumver = Double(result.text!)!
        if sender.tag == 17{
            formula.text! += "√"
            result.text = String(sqrt(previousNumver))
        }
        else if sender.tag == 18{
            formula.text! += "%"
            result.text = String(previousNumver / 100)
        }
    }
}
@IBAction func buttons(_ sender: UIButton) {
    //
    if formula.text != "" && sender.tag != 11 && sender.tag != 16 {
        previousNumver = Double(result.text!)!
        
        if sender.tag == 12{
            result.text = "+"
            formula.text! += "+"
        }
        else if sender.tag == 13{
            result.text = "-"
            formula.text! += "-"
        }
        else if sender.tag == 14{
            result.text = "×"
            formula.text! += "×"
        }
        else if sender.tag == 15{
            result.text = "÷"
            formula.text! += "÷"
        }
        operation = sender.tag
        performingMath = true
        buttonA.isEnabled = true
        
    }
    else if sender.tag == 16 {
        if operation == 12{
            result.text = String(previousNumver + numberOnScreen)
        }
        else if operation == 13{
            result.text = String(previousNumver - numberOnScreen)
        }
        else if operation == 14{
            result.text = String(previousNumver * numberOnScreen)
        }
        else if operation == 15{
            result.text = String(previousNumver / numberOnScreen)
        }
        
        
        let isIntegerP = floor(previousNumver) == previousNumver
        let isIntegerN = floor(numberOnScreen) == numberOnScreen
        
        if previousNumver % numberOnScreen != 0 || isIntegerP == false || isIntegerN == false {
        
            result.text = String(format:"%.0f",result.text ?? 0 )
        }
    }
    else if sender.tag == 11{
        result.text = ""
        formula.text = ""
        previousNumver = 0;
        numberOnScreen = 0;
        operation = 0;
        buttonA.isEnabled = true
    }
}
override func viewDidLoad() {
    result.text = ""
    formula.text = ""
}

}