View+AutoEdgePopover.swift

import SwiftUI

extension View {
    
    /// A custom popover modifier that ensures the system automatically selects the best
    /// orientation for the popover's arrow, compatible with both iOS 17 and 18.
    ///
    /// On iOS 17, the `arrowEdge` is treated as a hint and may be ignored if the popover does
    /// not fit. On iOS 18, the `arrowEdge` is strictly enforced, potentially causing layout
    /// issues if the content doesn't fit.
    ///
    /// This modifier uses the new iOS 18 behavior where the system automatically selects the
    /// best edge. Use this if you want automatic arrow orientation on iOS 18 and backward
    /// compatibility with iOS 17.
    ///
    /// - Parameters:
    ///   - isPresented: A binding to a Boolean that controls the popover's visibility.
    ///   - attachmentAnchor: The attachment anchor for the popover's position.
    ///   - content: The content of the popover.
    ///
    /// Source: https://developer.apple.com/forums/thread/756873?answerId=802811022#802811022
    @ViewBuilder
    internal func autoEdgePopover<Content: View>(
        isPresented: Binding<Bool>,
        attachmentAnchor: PopoverAttachmentAnchor = .rect(.bounds),
        @ViewBuilder content: @escaping () -> Content
    ) -> some View {
        if #available(iOS 18, *) {
            self
                .popover(
                    isPresented: isPresented,
                    attachmentAnchor: attachmentAnchor,
                    content: content
                )
        } else {
            self
                .popover(
                    isPresented: isPresented,
                    attachmentAnchor: attachmentAnchor,
                    arrowEdge: .top,
                    content: content
                )
        }
    }
    
}