How to pass data from ViewDidLoad to a function of a button - ios

Question

I have two Random numbers generating in ViewDidLoad. I Want to plus these two numbers and the result should be checked in a button with data of a input field. my problem is that I do not know how to transfer result to the function CheckResultBtn . now it does not recognise result.
here is My codes and I really appreciate any kinds of help
class ViewController: UIViewController {
#IBOutlet weak var lblRandomNumOne: UILabel!
#IBOutlet weak var lblRandomNumTwo: UILabel!
#IBOutlet weak var KidsField: UITextField!
#IBOutlet weak var Showresult: UILabel!
#IBOutlet weak var CheckResult: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let x = Int.random(in: 0 ..< 10)
lblRandomNumOne.text = String(x);
let y = Int.random(in: 0 ..< 10)
lblRandomNumTwo.text = String(y);
let result = x + y;
CheckResultBtn(result) //not sure about this
}
#IBAction func CheckResultBtn(_ sender: Any)
{
if (KidsField != nil)
{
let kidsresult = Int(KidsField.text!) ;
if (result == kidsresult)
{
Showresult.text = "Bravo";
}
else
{
Showresult.text = "Try Again!"
}
}
}
}

Answer 1

declare the variable "result" before the viewDidload function
var result : Int!
then proceed to perform the operation on the variable in your viewDidload and you can get rid of this line
CheckResultBtn(result)
and you should be able to access the result variable in your IBAction function

Answer 2

You can try
#IBAction func checkResultBtn(_ sender: Any) {
displayRes(Int(kidsField.text!)!)
}
func displayRes(_ result:Int) {
showresult.text = result == kidsresult ? "Bravo" : "Try Again!"
}
Then inside viewDidLoad
displayRes(x+y)

Answer 3

create a new function instead of using action Method
like this :
func CheckResultBtn(_ result : Int) {
if (KidsField != nil)
{
let kidsresult = Int(KidsField.text!) ;
if (result == kidsresult)
{
Showresult.text = "Bravo";
}
else
{
Showresult.text = "Try Again!"
}
}
}
or create a variable
var result : Int?
assign a value
result = x + y;
and use inside the action Method
var result : Int?
override func viewDidLoad() {
super.viewDidLoad()
let x = Int.random(in: 0 ..< 10)
lblRandomNumOne.text = String(x);
let y = Int.random(in: 0 ..< 10)
lblRandomNumTwo.text = String(y);
result = x + y;
}
#IBAction func CheckResultBtn(_ sender: Any) {
if (KidsField != nil)
{
let kidsresult = Int(KidsField.text!) ;
if (result == kidsresult)
{
Showresult.text = "Bravo";
}
else
{
Showresult.text = "Try Again!"
}
}
}