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//
// PresentationControllerDismissalInterceptor.swift
// MullvadVPN
//
// Created by pronebird on 20/02/2023.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import UIKit
/**
Presentation controller delegate class that intercepts interactive dismissal and calls
`dismissHandler` closure. Forwards all delegate calls to the `forwardingTarget`.
*/
final class PresentationControllerDismissalInterceptor: NSObject,
UIAdaptivePresentationControllerDelegate
{
private let dismissHandler: (UIPresentationController) -> Void
nonisolated(unsafe) private let forwardingTarget: UIAdaptivePresentationControllerDelegate?
private let protocolSelectors: [Selector]
init(
forwardingTarget: UIAdaptivePresentationControllerDelegate?,
dismissHandler: @escaping (UIPresentationController) -> Void
) {
self.forwardingTarget = forwardingTarget
self.dismissHandler = dismissHandler
protocolSelectors = getProtocolMethods(
UIAdaptivePresentationControllerDelegate.self,
isRequired: false,
isInstanceMethod: true
)
}
override func responds(to aSelector: Selector!) -> Bool {
super.responds(to: aSelector)
|| (protocolSelectors.contains(aSelector) && forwardingTarget?.responds(to: aSelector) ?? false)
}
override func forwardingTarget(for aSelector: Selector!) -> Any? {
if protocolSelectors.contains(aSelector) {
if super.responds(to: aSelector) {
return nil
} else if forwardingTarget?.responds(to: aSelector) ?? false {
return forwardingTarget
}
}
return super.forwardingTarget(for: aSelector)
}
func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
dismissHandler(presentationController)
forwardingTarget?.presentationControllerDidDismiss?(presentationController)
}
}
private func getProtocolMethods(
_ protocolType: Protocol,
isRequired: Bool,
isInstanceMethod: Bool
) -> [Selector] {
var methodCount: UInt32 = 0
let methodDescriptions = protocol_copyMethodDescriptionList(
protocolType,
isRequired,
isInstanceMethod,
&methodCount
)
defer { methodDescriptions.map { free($0) } }
return (0..<methodCount).compactMap { index in
methodDescriptions?[Int(index)].name
}
}
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