如何在Swift/ iOS中获取编程添加的视图的宽度和高度？

let View1: UIView = {
            let viewView = UIView()
            viewView.translatesAutoresizingMaskIntoConstraints = false
            viewView.contentMode = .scaleAspectFit
            print(UserDefaults.standard.bool(forKey: "backgroundColourSelected"))
            if UserDefaults.standard.bool(forKey: "backgroundColourSelected") {
                viewView.backgroundColor = self.viewColor
            }else {
                viewView.backgroundColor = .white
            viewView.clipsToBounds = true
            return viewView
        self.canvasView.addSubview(View1)
        View1.centerXAnchor.constraint(equalTo: canvasView.centerXAnchor, constant: 0).isActive = true
        View1.centerYAnchor.constraint(equalTo: canvasView.centerYAnchor, constant: 0).isActive = true
        View1.widthAnchor.constraint(equalTo: canvasView.widthAnchor, constant: 0).isActive = true
        View1.heightAnchor.constraint(equalTo: canvasView.widthAnchor, multiplier: aspectRatio).isActive = true

override func viewWillLayoutSubviews() {
    print(yourView.frame.height)
}

override func layoutSubviews() {
    print(yourView.frame.height)
    print(yourView.frame.width)
}

class YourController / YourView {
private let imgView: UIImageView = {
    let iv = UIImageView()
    // do whatever you want with your image using iv. eg. iv.contentMode = .scaleAspectFit or iv.image = UIImage(named: "custom_img")
    return iv
override func viewDidLoad() {
    super.viewDidLoad()
    view.addSubview(imgView)
    //set constraints for your

如何在Swift/ iOS中获取编程添加的视图的宽度和高度？

2 个回答