Swift3 iOS-導航中的圓角ImageView TitleView始終顯示正方形嗎？

Question

我在應用程序中有一個用於文檔個人資料圖片的圓形imageView。 我在整個應用程序中的tableView單元格和視圖控制器的不同視圖上多次使用該代碼。 個人資料圖片始終顯示為圓形。 當我使用以下代碼將個人資料圖片設置為在navItem的titleView內圓形時，它僅顯示為正方形。

為什么在navItem的titleView中不顯示圓形？

var url: String?//it's already set with some value

override func viewDidLoad() {
        super.viewDidLoad(){

        setTitleView(urlStr: url)
{

func setTitleView(urlStr: String?){

        let titleView = UIView()
        titleView.frame = CGRect(x: 0, y: 0, width: 44, height: 44)

        let containerView = UIView()
        containerView.translatesAutoresizingMaskIntoConstraints = false
        titleView.addSubview(containerView)

        let imageView = UIImageView()
        imageView.translatesAutoresizingMaskIntoConstraints = false
        imageView.contentMode = .scaleAspectFill
        imageView.layer.cornerRadius = imageView.frame.size.width / 2
        imageView.clipsToBounds = true
        imageView.layer.borderColor = UIColor.white.cgColor
        imageView.layer.borderWidth = 0.5
        imageView.backgroundColor = UIColor.white

        if let urlStr = urlStr{
            let url = URL(string: urlStr)
            imageView.sd_setImage(with: url!)
        }

        containerView.addSubview(imageView)

        imageView.leftAnchor.constraint(equalTo: containerView.leftAnchor).isActive = true
        imageView.centerYAnchor.constraint(equalTo: containerView.centerYAnchor).isActive = true
        imageView.widthAnchor.constraint(equalToConstant: 40).isActive = true
        imageView.heightAnchor.constraint(equalToConstant: 40).isActive = true

        containerView.centerXAnchor.constraint(equalTo: titleView.centerXAnchor).isActive = true
        containerView.centerYAnchor.constraint(equalTo: titleView.centerYAnchor).isActive = true

        navigationItem.titleView = titleView
}

Answer 1

看起來imageView.layer.cornerRadius = imageView.frame.size.width / 2設置為0 。 imageView.frame.size.width在這里等於0 。

可以使用let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))在創建let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))時預定義框架，而不是let imageView = UIImageView() let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 40, height: 40))