Modal overlay components: TTBasePopupViewController (dimmed overlay, tap-to-dismiss), TTDismissView (drag handle for sheets), and TTBasePresentationController / CoverVerticalPresentationController (custom presentation controls).

Class	Description
TTBasePopupViewController	Modal VC with 85% dark overlay, fade animation, tap-to-dismiss
TTDismissView	Drag handle indicator bar (bottom sheet style)
TTBasePresentationController	Base custom UIPresentationController
CoverVerticalPresentationController	Cover-from-bottom slide-up sheet
CoverVerticalViewController	VC preset for cover-vertical presentation

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📦 TTBasePopupViewController

// Subclass for your custom popup
class ConfirmationPopup: TTBasePopupViewController {

    private let panel = TTBaseShadowPanelView()
    private let titleLabel = TTBaseUILabel(withType: .TITLE, text: "Delete Item?", align: .center)
    private let cancelBtn = TTBaseUIButton(textString: "Cancel", type: .DEFAULT, isSetSize: false)
    private let confirmBtn = TTBaseUIButton(textString: "Delete", type: .WARRING, isSetSize: false)

    var onConfirm: (() -> Void)?

    init() {
        super.init(isAllowTouchPanel: true) // tap outside to dismiss
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        setupPanel()
    }

    func setupPanel() {
        view.addSubview(panel)
        panel.panelShadowView.addSubview(titleLabel)
        // ... add buttons
        confirmBtn.onTouchHandler = { [weak self] _ in
            self?.dismiss(animated: true)
            self?.onConfirm?()
        }
    }
}

// Present it
let popup = ConfirmationPopup()
popup.onConfirm = { self.viewModel.deleteItem() }
present(popup, animated: true)

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↕️ TTDismissView (drag handle)

// Add drag handle to bottom sheet
class BottomSheet: TTBasePopupViewController {
    private let dismissHandle = TTDismissView()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(dismissHandle)
        dismissHandle.setLeadingAnchor(constant: 0)
            .setTrailingAnchor(constant: 0)
            .setTopAnchor(constant: 0)
            .setHeightAnchor(constant: 24)

        // Add pan gesture for swipe-down dismiss
        let pan = UIPanGestureRecognizer(target: self, action: #selector(handlePan))
        dismissHandle.addGestureRecognizer(pan)
    }
}

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📖 TTBasePopupViewController Properties

Member	Type	Description
init(isAllowTouchPanel:)	Init	Allow/block tap-outside-to-dismiss
panelTouchView	TTBaseUIView	Transparent touchable dimming area
navType	.NO_VIEW	No navigation bar by default
modalPresentationStyle	.overCurrentContext	Shows over current screen
modalTransitionStyle	.crossDissolve	Fade in/out animation