How to round specific corners of a View?

Demo (Source code is available at the end of the post)

iOS 16+ built-in modifier (Xcode 15 needed)

Clip the view using the new UnevenRoundedRectangle:

.clipShape(
    .rect(
        topLeadingRadius: 0,
        bottomLeadingRadius: 20,
        bottomTrailingRadius: 0,
        topTrailingRadius: 20
    )
)

⚠️ Note: Although it works from iOS 16, .rect needs Xcode 15 to be available.

iOS 13+

You can use it like a normal modifier:

.cornerRadius(20, corners: [.topLeft, .bottomRight])

You need to implement a simple extension on View like this:

extension View {
    func cornerRadius(_ radius: CGFloat, corners: UIRectCorner) -> some View {
        clipShape( RoundedCorner(radius: radius, corners: corners) )
    }
}

And here is the struct behind this:

struct RoundedCorner: Shape {

    var radius: CGFloat = .infinity
    var corners: UIRectCorner = .allCorners

    func path(in rect: CGRect) -> Path {
        let path = UIBezierPath(roundedRect: rect, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
        return Path(path.cgPath)
    }
}

_{You can also use the shape directly as a clipping mask.}

Sample Project:

iOS 13 – Source code on gist

iOS 16 – Source code on gist