图像在 UIStackView 中未舍入

Question

我正在尝试舍入多个图像并将它们添加到堆栈视图中，由于某种原因它不起作用。基本上，我有一个包含所有UIImage名称的数组，并将它们分配给UIImageView。当我尝试从图像中制作一个圆圈时，它不起作用：

var navStackView : UIStackView = {
let stack = UIStackView()
stack.axis = .horizontal
stack.alignment = .center
stack.distribution = .fillEqually
// stack.spacing = -10
stack.translatesAutoresizingMaskIntoConstraints = false
return stack
}()
var images = ["1", "2", "3", "4"]
override func viewDidLoad() {
super.viewDidLoad()
let navController = navigationController!
navController.navigationBar.addSubview(navStackView)
// x, y, w, h
navStackView.leadingAnchor.constraint(equalTo: navController.navigationBar.leadingAnchor).isActive = true
navStackView.trailingAnchor.constraint(equalTo: navController.navigationBar.trailingAnchor).isActive = true
navStackView.topAnchor.constraint(equalTo: navController.navigationBar.topAnchor).isActive = true
navStackView.bottomAnchor.constraint(equalTo: navController.navigationBar.bottomAnchor).isActive = true

for image in images {
let imageView = UIImageView()
imageView.image = UIImage(named: image)
imageView.layer.cornerRadius = imageView.frame.height / 2
imageView.clipsToBounds = true
imageView.layer.masksToBounds = false
imageView.contentMode = .scaleAspectFit
//   imageView.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
navStackView.addArrangedSubview(imageView)
navStackView.layoutIfNeeded()
}
navigationItem.titleView = navStackView
}

Answer 1

你可以试试

var once = true
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if once {
navStackView.subviews.forEach { $0.layer.cornerRadius = $0.frame.height / 2 }
once = false
}
}