Passing parameters in a clickable UIabel - swift

Question

I'm trying to make a clickable UILabel by following with this code:
let tap_plato = UITapGestureRecognizer(target: self, action: #selector(ViewController.ale_plato1))
plato1.isUserInteractionEnabled = true
plato1.addGestureRecognizer(tap_plato)
...
#objc
func ale_plato1(sender: UITapGestureRecognizer){
let label = sender.view
print ("tapped!")
}
This works well. But I want to pass parameters to the function. Something like this:
let tap_plato = UITapGestureRecognizer(target: self, action: #selector(MenuController.ale_plato1("parameter")))
plato1.isUserInteractionEnabled = true
plato1.addGestureRecognizer(tap_plato)
#objc
func ale_plato1(sender: UITapGestureRecognizer, parameterRecived: String){
}
But I don't know how do that in swift 3...
Any help? Thanks you

Answer 1

Wherever you make your multiple UILabel set each label to a different tag.
for i in 0..<3 {
let label = UILabel()
label.tag = i
let tap = UITapGestureRecognizer(target: self, action: #selector(tap))
label.isUserInteractionEnabled = true
label.addGestureRecognizer(tap_plato)
}
#objc func tap(sender: UITapGestureRecognizer) {
let label = sender.view as! UILabel // if you are SURE that your tap will be a UILabel
if(label.tag == 0) {
label.text = "This is label 0"
if(label.tag == 1) {
label.text = "This is label 1"
}
}
Threw this up in a jiffy, hop over the syntax issues if there are any.
Here we can create labels with tags and apply the same tap to them. From there, we can check what tag it is inside the tap method and do something from there.

Answer 2

You could use the tag attribute for Int values, but if you want anything other than that:
Create a custom UILabel Class with a value variable.
class LabelWithValue : UILabel {
var value : String = ""
}
Then you can use it as a normal Label
let label = LabelWithValue()
label.text = "bla"
label.value = "Anything"
label.isUserInteractionEnabled = true
label.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleGetText)))
Then you can get it's text and it's value.
#objc func handleGetText(_ sender : UITapGestureRecognizer) {
if let label = sender.view as? LabelWithValue {
print(label.text)
print(label.value)
}
}