Swift 4 how to count the distance between 2 elements in an array with all unique elements?

Question

I'm trying to create a simple array in my apps. May I know how to calculate distance between 2 elements in my array? Example:-

I have an array as below:-

var aryNumberList = ["7","4","8","6","9","1"]

if i get my textfield A = 7 and textfield B = 9 So my expected output is 4

if i get my textfield A = 6 and textfield B = 1 So my expected output is 2

if i get my textfield A = 1 and textfield B = 6 So my expected output is 4 (** will continue from begin)

Your help is appreciated! Thank you.

Answer 1

var positionA = 0 // declare as global variable
var positionB = 0 // declare as global variable

for i in 0 ..< aryNumberList.count  {

    if Int(aryNumberList[i]) == textfieldA.text {

            positionA = i
    }

    if Int(aryNumberList[i]) == textfieldB.text {

            positionB = i
    }
}

if positionA > positionB {

    print("** will continue from begin")

}else {

    var distance = positionB - positionA

    print("\(distance)")
}