AgeGateSDK/Navigation/Transition/CoverPresentationController.swift - develop - sberpay/AgeGate-iOS

AgeGateSDK/Navigation/Transition/CoverPresentationController.swift
86 строк3 KB
SergeyGladkiy
[0.2.0] БДСЧ сценарий
30 июл 2026, 21:57
30 июл 2026, 21:57cbcdfcb
//
//  CoverPresentationController.swift
//  SPaySdk
//
//  Created by Alexander Ipatov on 05.12.2022.
//

import UIKit

/// Шторка прижата к низу, высота не больше экрана минус safe area сверху.
/// Затемнение под ней появляется вместе с показом.
final class AGTCoverPresentationController: UIPresentationController {

    override var shouldPresentInFullscreen: Bool { false }

    /// Полноэкранный режим: шторка занимает всю доступную высоту
    /// (контейнер минус вырез сверху). Для экрана БДСЧ.
    var isFullHeight = false

    private lazy var dimmView: UIView = {
        let view = UIView()
        view.backgroundColor = .black.withAlphaComponent(0.2)
        view.tag = .agtDimmViewTag
        return view
    }()

    override func presentationTransitionWillBegin() {
        super.presentationTransitionWillBegin()

        guard let containerView, let presentedView else { return }

        presentedView.translatesAutoresizingMaskIntoConstraints = false
        dimmView.translatesAutoresizingMaskIntoConstraints = false

        containerView.addSubview(dimmView)
        containerView.addSubview(presentedView)

        dimmView.alpha = 0
        animateAlongsideTransition { self.dimmView.alpha = 1 }

        NSLayoutConstraint.activate([
            dimmView.topAnchor.constraint(equalTo: containerView.topAnchor),
            dimmView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
            dimmView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
            dimmView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),

            presentedView.bottomAnchor.constraint(equalTo: containerView.bottomAnchor),
            presentedView.leadingAnchor.constraint(equalTo: containerView.leadingAnchor),
            presentedView.trailingAnchor.constraint(equalTo: containerView.trailingAnchor),
            presentedView.heightAnchor.constraint(lessThanOrEqualTo: containerView.heightAnchor,
                                                  constant: -containerView.safeAreaInsets.top)
        ])
    }

    private func heightConstraint(for presentedView: UIView,
                                 in containerView: UIView) -> NSLayoutConstraint {
        if isFullHeight {
            // На весь экран целиком, включая область под вырезом.
            return presentedView.heightAnchor.constraint(
                equalTo: containerView.heightAnchor)
        }
        // По контенту, но не выше экрана минус вырез сверху.
        return presentedView.heightAnchor.constraint(
            lessThanOrEqualTo: containerView.heightAnchor,
            constant: -containerView.safeAreaInsets.top)
    }

    override func presentationTransitionDidEnd(_ completed: Bool) {
        guard !completed else { return }
        dimmView.removeFromSuperview()
        presentedView?.removeFromSuperview()
    }

    override func dismissalTransitionWillBegin() {
        super.dismissalTransitionWillBegin()
        animateAlongsideTransition { self.dimmView.alpha = 0 }
    }

    private func animateAlongsideTransition(_ animation: @escaping AGTAction) {
        guard let coordinator = presentedViewController.transitionCoordinator else {
            animation()
            return
        }
        coordinator.animate { _ in animation() }
    }
}