How to create a rolling effect for a slot machine in swift?

@objc func updateRandom(){
    if(counter >= 1 && counter <= 200){
        self.shakeAction()
    }
    if(counter > 200){
        self.ReTime()
    }

    counter += 1
}

public func shakeAction(){
    let datepickerViewMiddle = dateStrings.count
    let payerpickerViewMiddle = payerStrings.count
    print ("Shake")
    print (datepickerViewMiddle)
    print (payerpickerViewMiddle)
    random1=Int(arc4random_uniform(UInt32(datepickerViewMiddle)+1))
    random2=Int(arc4random_uniform(UInt32(payerpickerViewMiddle)+1))
    //random1=Int(arc4random_uniform(UInt32(4)+1))
    dateOptions.selectRow(random1-1, inComponent: 0, animated: true)
    let when = DispatchTime.now() + 0.5 // change 2 to desired number of seconds
    DispatchQueue.main.asyncAfter(deadline: when) {
        // Your code with delay
        self.payerOptions.selectRow(self.random2-1, inComponent: 0, animated: true)
    }

    print(random1)
    print(random2)

    if (UserDefaults.standard.object(forKey: "ShakeCount") as? Int) != nil
    {
        var x = UserDefaults.standard.object(forKey: "ShakeCount") as? Int
        x = x!+10;
        UserDefaults.standard.set(x, forKey: "ShakeCount")
    }
    else{
        UserDefaults.standard.set(5, forKey: "ShakeCount")
    }
}

func ReTime(){
    if(rolling == false){
        counter=0
        rolling = true
        self.updateRandom()
    }
    else{
        rolling = false
        timer.invalidate()
        counter=0
    }
}

I am building a slot machine in IOS Swift, and I am having trouble getting to look like more of a slot machine. I can get the picker view to spin but only a little, it only seems to move a few rows and sometimes doesn't move at all. Therefore, I would like to know how to get a consistent spin out of the pickerview to make it look. What I have it doing right now is basically just taking the pickerview and randomly selecting a row 200 times in order to make it look like it's kind of spinning, but not for as long as I would like. I have been trying to research this and haven't really found anything that could help me in this specific situation. The things I have found are either outdated or are just doing the same thing I am already doing, Therefore I would appreciate the help on fixing this issue.