ios - Swift 无法圆化我的 UIButton 的角

Question

我几乎查看了所有的 stackoverflow 解决方案，但出于某种奇怪的原因，我的按钮不会出现圆角。有人可以检查一下我做错了什么吗？

let goToMapsButton = UIButton(type: .custom)
    scrollView.addSubview(goToMapsButton)
       _ = goToMapsButton.anchor(map.bottomAnchor, left: nil, bottom: seperator.topAnchor, right: self.view.rightAnchor, topConstant: 16, leftConstant: 0, bottomConstant: 16, rightConstant: 16, widthConstant: 50, heightConstant: 50)


    goToMapsButton.backgroundColor = .green
    goToMapsButton.layer.cornerRadius = 0.5 * goToMapsButton.bounds.size.width
    goToMapsButton.clipsToBounds = true
    goToMapsButton.layer.masksToBounds = true

顺便说一句，如果该信息有所作为，我会在 View Controller 的 viewDidLoad 部分中完成这一切。

这里是完整的 viewDidLoadClass 供引用:` override func viewDidLoad() { super.viewDidLoad()

    let map = MKMapView()
    let view1 = UIView()
    view1.backgroundColor = .red

    let storeAddress = UILabel()
    storeAddress.text = "318 Atwood Avenue"
    storeAddress.font = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.medium)

    let storeCity = UILabel()
    storeCity.text = "Rainy River"
    storeCity.font = UIFont.systemFont(ofSize: 20, weight: UIFont.Weight.medium)

    let seperator = UIView()
    seperator.backgroundColor = .lightGray

    let goToMapsButton = UIButton(type: .custom)


    scrollView.addSubview(map)
    scrollView.addSubview(view1)
    scrollView.addSubview(storeAddress)
    scrollView.addSubview(storeCity)
    scrollView.addSubview(goToMapsButton)
    scrollView.addSubview(seperator)

    map.anchorToTop(scrollView.topAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor)
    map.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.6).isActive = true

    _ = storeAddress.anchor(map.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: nil, topConstant: 16, leftConstant: 16, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
    _ = storeCity.anchor(storeAddress.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: nil, topConstant: 8, leftConstant: 16, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)

    _ = goToMapsButton.anchor(map.bottomAnchor, left: nil, bottom: nil, right: self.view.rightAnchor, topConstant: 16, leftConstant: 0, bottomConstant: 16, rightConstant: 16, widthConstant: 50, heightConstant: 50)
    goToMapsButton.backgroundColor = .green
    print(goToMapsButton.frame.width)
    goToMapsButton.layer.cornerRadius = 0.25 * goToMapsButton.frame.width
    goToMapsButton.clipsToBounds = true
    goToMapsButton.layer.masksToBounds = true


    _ = seperator.anchor(storeCity.bottomAnchor, left: self.view.leftAnchor, bottom: nil, right: self.view.rightAnchor, topConstant: 8, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 1)

    view1.anchorToTop(map.bottomAnchor, left: self.view.leftAnchor, bottom: scrollView.bottomAnchor, right: self.view.rightAnchor)
    view1.heightAnchor.constraint(equalTo: self.view.heightAnchor, multiplier: 0.8).isActive = true

}`

Answer 1

将此代码移至 viewWillLayoutSubviews 中:

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    goToMapsButton.layer.cornerRadius = 0.25 * goToMapsButton.frame.width
}

或者为带有圆角的按钮创建自定义类:

class RoundedButton: UIButton {
    @IBInspectable var cornerRadius: CGFloat = 0

    override func layoutSubviews() {
        super.layoutSubviews()
        clipsToBounds = true
        layer.cornerRadius = cornerRadius
    }
}