我正在嘗試圍繞 UIView 的頂部兩個角并使用 UIView 擴展在此視圖上方添加陰影。但是我想出的解決方案不起作用。當我使用以下解決方案時，陰影僅出現在圓角中，而不是在我想要的視圖上方。
extension UIView {
func roundCornersWithShadow(_ corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
layer.mask = mask
mask.path = path.cgPath
mask.shadowColor = UIColor.black.cgColor
mask.shadowPath = mask.path
mask.shadowOffset = CGSize(width: 0.0, height: -2.0)
mask.shadowOpacity = 0.9
mask.shadowRadius = 3
layer.masksToBounds = false
}
}
uj5u.com熱心網友回復：
[SWIFT-5] iOS 11 引入了 maskedCorners，可以產生更平滑和更好質量的結果。您仍然可以在函式呼叫中使用 UIRectCorner 并將其轉換為 CACornerMask：
extension UIView {
func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
if #available(iOS 11.0, *) {
clipsToBounds = true
layer.cornerRadius = radius
layer.maskedCorners = CACornerMask(rawValue: corners.rawValue)
} else {
let path = UIBezierPath(
roundedRect: bounds,
byRoundingCorners: corners,
cornerRadii: CGSize(width: radius, height: radius)
)
let mask = CAShapeLayer()
mask.path = path.cgPath
layer.mask = mask
}
}
}
uj5u.com熱心網友回復：
//must be used layoutSubviews inside .
override func layoutSubviews() {
super.layoutSubviews()
backView.round(corners: [.topLeft,.topRight], radius: 40)
}
uj5u.com熱心網友回復：
你可以使用這個擴展：
extension UIView {
/// Rounds ``UIView`` corners.
/// - Parameters:
/// - maskedCorners: Corners to be rounded.
/// - cornerRadius: Value to be set as corner radius.
func roundCorners(maskedCorners: CACornerMask = [.layerMinXMinYCorner, .layerMaxXMinYCorner],
cornerRadius: CGFloat = roundedCornersRadius) {
layer.cornerRadius = cornerRadius
layer.maskedCorners = maskedCorners
layer.masksToBounds = true
}
}
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