swift frameとboundsの違い

Question

class ViewController: UIViewController {

var subView = UIView()
var subView2 = UIView()
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    
    
    let origin = CGPoint(x: 100, y: 100)
    let size = CGSize(width: 50, height: 50)
    let frame = CGRect(origin: origin, size: size)
    subView.frame = frame
    subView.backgroundColor = .red
    view.addSubview(subView)
    
    let origin2 = CGPoint(x: 100, y: 100)
    let size2 = CGSize(width: 50, height: 50)
    let frame2 = CGRect(origin: origin2, size: size2)
    subView2.bounds = frame2
    subView2.backgroundColor = .red
    view.addSubview(subView2)
   
}

}
subView.frame = frameとsubView2.bounds = frame2において、位置の数値は同じ指定なのにな
frameかboundsの指定の違いでなぜ違いが出るのでしょうか？

Comments

[hoshi-takanori]

ご参考まで。
https://selection9.blogspot.com/2016/06/uiviewframebounds.html