Updating Label on Button Click - swift3

Question

I have two buttons as right and left arrow on my main page and every time a button is clicked UILabel is updated through an array e.g let names = ["John, Smith, "Ahmed", "Jack", "Kathy"]. I have two UIActions as rightArrowClicked and leftArrowClicked. Initially the label should appear as John with left arrow disabled, which'll be done by the isHidden property of leftArrow and likewise when the value is Kathy then rightArrow should be disabled. Along with that i also need to update another label w.r.t to the name value e.g john can have a value of "cute", and kathy as "pretty" and these values are coming from an external library which i've added via cocoapods which are being generated in a function of that class. Any ideas how would i do that?

Answer 1

This is code with simple logic that you need
let names = ["John", "Smith", "Ahmed", "Jack", "Kathy"]
var currentIndex = 0
leftButton.isHidden = true
#IBAction func left(_ sender: Any) {
currentIndex --
label.text = names[currentIndex]
if currentIndex == 0 {
leftButton.isHidden = true
}
rightButton.isHidden = false
}
#IBAction func right(_ sender: Any) {
currentIndex ++
label.text = names[currentIndex]
if currentIndex == names.count - 1 {
rightButton.isHidden = true
}
leftButton.isHidden = false
}

Answer 2

You can try like below and call updateButtonsState() in viewDidLoad method
let names = ["John", "Smith", "Ahmed", "Jack", "Kathy"]
let nature = ["cute", "pretty", "cute", "pretty", "cute"]
var currenIndex = 0
#IBAction func leftBtnClick(_ sender: UIButton) {
currenIndex = currenIndex - 1
updateButtonsState()
}
#IBAction func rignthBtnClick(_ sender: UIButton) {
currenIndex = currenIndex + 1
updateButtonsState()
}
func updateButtonsState() {
leftBtn.isEnabled = currenIndex > 0 ? true : false
rightBtn.isEnabled = currenIndex < names.count - 1 ? true : false
if currenIndex >= 0 && currenIndex < names.count {
lblName.text = names[currenIndex]
lblNameWithNature.text = nature[currenIndex]
}
print("currenIndex == \(currenIndex)")
}