View + UIModalPresentationStyle

View+UIModalPresentationStyle.swift

public extension View {
    /// Present another SwiftUI `View` by embedding it into a `UIHostingController` and presenting it on the key `UIViewController`, on the top-most `UIWindow`.
    ///
    /// This extension was originally copied from [this Medium article](https://medium.com/@cuongnguyenhuu/how-to-present-a-screen-with-modalpresentationstyle-in-swiftui-like-uikit-fe9b53e09d72) written by Cuon (Currie) H. NGUYEN.
    ///
    /// The code has been updated to fix warnings and implicitly unwrapped optional variables.
    /// - Parameters:
    ///   - isPresented: Whether or not the `Content` view is presented.
    ///   - modalPresentationStyle: The `UIModalPresentationStyle` to present with.
    ///   - content: The `Content` view that will desplay when `isPresented` is `true`.
    /// - Returns: The current view.
    func modal<Content: View>(
        isPresented: Binding<Bool>,
        style modalPresentationStyle: UIModalPresentationStyle,
        @ViewBuilder content: @escaping () -> Content,
        completion: (() -> Void)? = nil
    ) -> some View {
        guard isPresented.wrappedValue else {
            return self
        }
        UIWindow.key?.isHidden = true
        let viewController = UIHostingController(rootView: content())
        viewController.modalPresentationStyle = modalPresentationStyle
        UIViewController.key?.present(viewController, animated: true, completion: completion)
        return self
    }
}

extension UIWindow {
    static var key: UIWindow? {
        UIApplication.shared.connectedScenes
            .filter { $0.activationState == .foregroundActive }
            .map { $0 as? UIWindowScene }
            .compactMap { $0 }
            .first?
            .windows
            .filter { $0.isKeyWindow }
            .first
    }
}

extension UIViewController {
    static var key: UIViewController? {
        guard
            let window = UIWindow.key,
            let rootViewController = window.rootViewController
        else {
            return nil
        }
        var topController = rootViewController
        while let newTopController = topController.presentedViewController {
            topController = newTopController
        }
        return topController
    }
}