설명

구현

import UIKit


class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()


        let title = UILabel()
        title.text = "真ん中だぜ"
        title.frame = CGRect(x:50,y:50,width: 250,height:250)
        title.textAlignment = .center


        title.center = self.view.center
        //title.center.x = self.view.center.x
        //title.center.y = self.view.center.y
        self.view.addSubview(title)

    }

실행 결과

참고