Swift: one button to alternate multiple test message in UIView - ios

Question

I am trying to implement one button- one click to display the first message, the second click would change to second message, the third click would change to the third message.
I looked up to one possible solution is to use UITapGestureRecognizer - single tap and double tap, which means I can trigger the button (single tap to display the first message and double tap to display the second message).
However, if I have more than two lines and I just want to display them by clicking each one (like animation). Would that be possible to just deal with that inside one UIView and UIbutton?
I currently have 3 simple messages:
#IBOutlet weak var Textfield: UITextView!
#IBOutlet weak var Changingbutton: UIButton!
#IBAction func ChangingTapped(_ btn: UIButton) {
Textfield.text = "Changing to driving"
Textfield.text = "Changing to walking"
Textfield.text = "Changing to cycling"
}
The problem now is when I click the button it would just go the last message. That might not be a clever way to do so.
Thanks so much for the inputs and I am sorry if that is a rather simple question.

Answer 1

You can implement a custom CaseIterable enumeration to perform a loop so that you can get the next element every time you press a button:
extension CaseIterable where Self: Equatable {
var allCases: AllCases { Self.allCases }
var nextCase: Self {
let index = allCases.index(after: allCases.firstIndex(of: self)!)
guard index != allCases.endIndex else { return allCases.first! }
return allCases[index]
}
#discardableResult
mutating func next() -> Self {
self = nextCase
return self
}
}
Create a enumeration with your transportation modes:
enum Mode: String, CaseIterable {
case cycling, driving, walking
}
add a mode property to your view controller and set the initial value
var mode: Mode = .cycling
Now you can simply call the next mode method every time you press the button:
func ChangingTapped(_ btn: UIButton) {
Textfield.text = "Changing to " + mode.next().rawValue
}
Note: It is Swift naming convention to name your methods and properties starting with a lowercase letter.

Answer 2

Why not just set a counter and increment it every time your IBAction is activated?
var x = 0
#IBAction func ChangingTapped(_ btn: UIButton) {
if(x==0){
Textfield.text = "Changing to driving"
}
else if(x==1){
Textfield.text = "Changing to walking"
}
else{
Textfield.text = "Changing to cycling"
}
x +=1
//if x needs to be reset
/*
if(x > 2) x = 0
*/
}