Pass data from a VC without Segue to a non VC Class

Question

I passed data from ViewController1 to ViewController2 via segue, but how can I send data to the Class? This class is not a ViewController.

• ViewController1 has a UIPickerView that gives the data (String).

• The String will complete an URL needed in ViewController2.

Class

class A: SendDataFromDelegate {

func sendData(data: String) {
    self.data = data
}

var delegate : SendDataFromDelegate?

ViewController1

@IBAction func Picker(_ sender: Any) {
     var delegate: SendDataFromDelegate?
     delegate?.sendData(data: data)
    }

protocol  SendDataFromDelegate {
   func sendData(data : String)
   }

Is this a good way to do it?

Or should I create all the possible URLs in the class, and call them from ViewController2?

Answer 1

You should create a protocol with delegate functions like this:

protocol ClassDelegate: class {
  func doSomething()
}

In your class A you should implement that protocol this way:

class A: ClassDelegate {
  inAFunction(){
    ViewController1.delegate = self
  }

  func sendData(data: String) {
    self.data = data
  }
}

In the viewController you want to send data to your Class A you should have reference of your class A and use the delegate variable:

class ViewController1: UIViewController {
  weak var delegate: ClassDelegate?
  func clickHere(){
    delegate.sendData()
  }
}

When you use clickHere function it triggers Class C sendData function.

Try it ;D