How to delegate from separate class other than ViewController class

Using Swift
,
1 
`import UIKit`

`class Names`

`{`

`static let names = ["T","A","H","A"]`

`}`

`class ViewController: UIViewController`

`{`

`override func viewDidLoad()`

`{`

`super.viewDidLoad()`

`showView()`

`}`

`func showView()`

`{`

`let picker = UIPickerView()`

`picker.delegate = self`

`picker.dataSource = self`

`view.addSubview(picker)`

`}`

`}`

`extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource`

`{`

`func numberOfComponents(in pickerView: UIPickerView) -> Int {`

`return 1`

`}`

`func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {`

`Names.names.count`

`}`

`func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {`

`let localrow = Names.names[row]`

`return localrow`

`}`

`}`

this class just show a picker with four letters, however all the code is inside the main View i.e ViewController. what I want is how to create a separate class that will contain the datasource the delegate, and the UIPickerView for the UIPicker. and just use that class in main viewdidload. for example

`class ViewController: UIViewController`

`{`

`override func viewDidLoad()`

`{`

`super.viewDidLoad()`

`let picker = MyPickerClass`

`view.addsubview(picker)`

`}`
2 
class PickerDelegate: UIPickerViewDelegate, UIPickerViewDataSource {
// etc.
}

func showView() {
  pickerDelegate = PickerDelegate()
  let picker = UIPickerView()
  picker.delegate = pickerDelegate
  picker.dataSource = pickerDelegate
  view.addSubview(picker)
}
4

Cannot declare conformance to 'NSObjectProtocol' in Swift; 'PickerDelegate' should inherit 'NSObject' instead

5

Glad you figured it out.

Yes, the delegate callbacks need to be on an NSObject subclass.

This design can be called MVVM where your delegate object is a View Model. If you have multiple pickers or similar in a single view controller this is a good way to implement separation of concerns.