import UIKit

class CustomView: UIView {
    
    var imageView: UIImageView!
    
    //Detailed explanation ①
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    //Detailed explanation ②
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    
    private func setup(){
        let iWidth: CGFloat = 200
        let iHeight: CGFloat = 200
        let posX: CGFloat = (self.frame.width - iWidth)/2
        let posY: CGFloat = (self.frame.height - iHeight)/2
        
        imageView = UIImageView(frame: CGRect(x: posX, y: posY, width: iWidth, height: iHeight))
        imageView.image = UIImage(named: "hoge")
        self.addSubview(imageView)
    }
    
}

import UIKit

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()

        let customView = CustomView()
        customView.frame = CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height)
        self.view.addSubview(customView)
    }
}

override init(frame: CGRect) {
    super.init(frame: frame)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

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