UICloudSharingController

UICloudSharingController

我有一个使用SwiftUI的项目,该项目需要CloudKit共享,但是我无法获得UICloudSharingController在SwiftUI环境中正常播放。

第一个问题

使用UICloudSharingController进行UIViewControllerRepresentable的直接换行会产生无穷的旋转器(请参阅this)。正如对其他系统 Controller (如UIActivityViewController)所做的一样,我将UICloudSharingController包装在一个包含UIViewController的过程中,如下所示:

struct CloudSharingController: UIViewControllerRepresentable {
    @EnvironmentObject var store: CloudStore
    @Binding var isShowing: Bool

    func makeUIViewController(context: Context) -> CloudControllerHost {
        let host = CloudControllerHost()
        host.rootRecord = store.noteRecord
        host.container = store.container
        return host
    }

    func updateUIViewController(_ host: CloudControllerHost, context: Context) {
        if isShowing, host.isPresented == false {
            host.share()
        }
    }
}


final class CloudControllerHost: UIViewController {
    var rootRecord: CKRecord? = nil
    var container: CKContainer = .default()
    var isPresented = false

    func share() {
        let sharingController = shareController
        isPresented = true
        present(sharingController, animated: true, completion: nil)
    }

    lazy var shareController: UICloudSharingController = {
        let controller = UICloudSharingController { [weak self] controller, completion in
            guard let self = self else { return completion(nil, nil, CloudError.controllerInvalidated) }
            guard let record = self.rootRecord else { return completion(nil, nil, CloudError.missingNoteRecord) }

            let share = CKShare(rootRecord: record)
            let operation = CKModifyRecordsOperation(recordsToSave: [record, share], recordIDsToDelete: [])
            operation.modifyRecordsCompletionBlock = { saved, _, error in
                if let error = error {
                    return completion(nil, nil, error)
                }
                completion(share, self.container, nil)
            }
            self.container.privateCloudDatabase.add(operation)
        }
        controller.delegate = self
        controller.popoverPresentationController?.sourceView = self.view
        return controller
    }()
}

这可以使 Controller 正常启动,但是...

第二个问题

点按关闭按钮或滑动即可关闭, Controller 将消失,但不会通知您已将其关闭。启动呈现 Controller 的SwiftUI View 的@State属性仍然是true。没有明显的方法可以检测出模态是否消失。经过一些试验,我发现呈现 Controller 是在UIHostingController中创建的原始SceneDelegate。对于某些黑客,您可以将UIHostingController子类中引用的对象注入(inject)CloudSharingController中。这将使您检测到解雇并将@State属性设置为false。但是,所有导航栏按钮在关闭后均不再起作用,因此您只能轻按一次该按钮。场景的其余部分完全可以使用,但是导航栏中的按钮没有响应。

第三个问题

即使您可以正常显示和关闭UICloudSharingController,点击任何共享方法(消息,邮件等)也可以使 Controller 消失而没有动画,并且共享URL的 Controller 也不会出现。没有崩溃或控制台消息-它只是消失了。

演示

我在GitHub上做了一个快速而肮脏的项目来演示这个问题:CloudKitSharing。它只是使用CloudKit创建一个String和一个CKRecord来表示它。该界面通过单个导航栏按钮显示String(一个UUID)来共享它:

ios - SwiftUI和UICloudSharingController彼此讨厌-LMLPHP

认罪

有什么方法可以在SwiftUI中使用UICloudSharingController吗?没有时间在UIKit或自定义共享 Controller 中重建项目(我知道-处于前沿的价格💩)

最佳答案

我已经开始工作了-最初,我将UICloudSharingController包装在UIViewControllerRepresentable中,就像您提供的链接(在构建它时引用了它一样),然后将其简单地添加到SwiftUI .sheet() View 中。这在iPhone上可行,但在iPad上却失败了,因为它需要您设置popoverPresentationController?.sourceView,而我没有一个,因为我用SwiftUI Button触发了工作表。

回到绘图板上,我将按钮本身重新构建为UIViewRepresentable,并且能够使用SeungUn Ham在此处建议的rootViewController技巧来呈现 View 。所有功能都可以在iPhone和iPad上使用-至少在模拟器中如此。

我的按钮:

struct UIKitCloudKitSharingButton: UIViewRepresentable {
    typealias UIViewType = UIButton

    @ObservedObject
    var toShare: ObjectToShare
    @State
    var share: CKShare?

    func makeUIView(context: UIViewRepresentableContext<UIKitCloudKitSharingButton>) -> UIButton {
        let button = UIButton()

        button.setImage(UIImage(systemName: "person.crop.circle.badge.plus"), for: .normal)
        button.addTarget(context.coordinator, action: #selector(context.coordinator.pressed(_:)), for: .touchUpInside)

        context.coordinator.button = button
        return button
    }

    func updateUIView(_ uiView: UIButton, context: UIViewRepresentableContext<UIKitCloudKitSharingButton>) {

    }

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    class Coordinator: NSObject, UICloudSharingControllerDelegate {
        var button: UIButton?

        func cloudSharingController(_ csc: UICloudSharingController, failedToSaveShareWithError error: Error) {
            //Handle some errors here.
        }

        func itemTitle(for csc: UICloudSharingController) -> String? {
            return parent.toShare.name
        }

        var parent: UIKitCloudKitSharingButton

        init(_ parent: UIKitCloudKitSharingButton) {
            self.parent = parent
        }

        @objc func pressed(_ sender: UIButton) {
            //Pre-Create the CKShare record here, and assign to parent.share...

            let sharingController = UICloudSharingController(share: share, container: myContainer)

            sharingController.delegate = self
            sharingController.availablePermissions = [.allowReadWrite]
            if let button = self.button {
                sharingController.popoverPresentationController?.sourceView = button
            }

            UIApplication.shared.windows.first?.rootViewController?.present(sharingController, animated: true)
        }
    }
}

10-06 00:50