'FirstViewController'型の値を 'UIViewController'の予想される引数型に変換できません。

Question

SegueUtils.sendDataPrepareSegue(segueName: "first", dVC: FirstViewController) 

//function defination of segue utils 
class func sendDataPrepareSegue(segueName: String, dVC: UIViewController) 
{ 
// calling prepare for segue here, is it the correct way of doing that if no, show me the path 
} 

Answer 1

FirstViewControllerのインスタンスを渡す必要があります。

let objFirst : FirstViewController // change as per your needs 
SegueUtils.sendDataPrepareSegue(segueName: "first", dVC: objFirst) 

Answer 2

これを試してみてください：

let vcFirst : FirstViewController! 
SegueUtils.sendDataPrepareSegue(segueName: "first", dVC: vcFirst)