How do I setUp a pickerView with 4 components, Arry? Swift - arrays

Question

I tried a lot but it just shows me "?" in the rows of the four components.
Is it possible to put a String at the first place in the Array Like as titles for the 4 components? I had the idea to change all the Integers in the arrays into Strings but it would takes me too long...
let componentOne = [1...1000]
let componentTwo = [1...59]
let componentThree = [1...59]
let componentFour = [1...3]
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 4
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == 0 {
return 1000
}
if component == 1 {
return 59
}
if component == 2 {
return 59
}
if component == 3 {
return 3
}
return component
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> Int {
if component == 0 {
let row = componentOne[row]
return 1000
}
if component == 1 {
let row = componentTwo[row]
return 59
}
if component == 2 {
let row = componentThree[row]
return 59
}
if component == 3 {
let row = componentFour[row]
return 10
}
return row
}
```

Answer 1

You can't just change the delegate method. This is the correct one:
func pickerView(_ pickerView: UIPickerView,
titleForRow row: Int,
forComponent component: Int) -> String?
You have:
func pickerView(_ pickerView: UIPickerView,
titleForRow row: Int,
forComponent component: Int) -> Int
You must return a String? no matter what -- if you change the function's return type to Int, it doesn't match the protocol requirement.
The good thing is that you can easily make a String from an Int. Just use String interpolation like this:
/// Inside pickerView(_:titleForRow:forComponent:)
let row = componentOne[row]
return "\(1000)"
}