swift - 如何在 SwiftUI 上启用核心数据加密？

Question

当我们处理包含委托(delegate)的 UIKit 项目时，我们只需要添加此代码

do {
    // Define Options
    let options: [AnyHashable: Any] = [
        NSPersistentStoreFileProtectionKey: FileProtectionType.complete
    ]

    // Add Persistent Store
    try persistentStoreCoordinator.addPersistentStore(ofType: NSSQLiteStoreType,
                                                      configurationName: nil,
                                                      at: persistentStoreURL,
                                                      options: options)
} catch {
    // Error Handling
    ...
}

为 Core Data 启用加密。

但是如何做到这一点，当你有一个 SwiftUI 应用程序时，WITHOUT A DELEGATE 只包含一个名为 Persistense.swift 的文件，其中包含:

import CoreData

struct PersistenceController {
    static let shared = PersistenceController()

    static var preview: PersistenceController = {
        let result = PersistenceController(inMemory: true)
        let viewContext = result.container.viewContext
      return result
    }()

    let container: NSPersistentContainer

    init(inMemory: Bool = false) {
        container = NSPersistentContainer(name: "TharmaTrack")
        if inMemory {
            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
        }
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

                /*
                Typical reasons for an error here include:
                * The parent directory does not exist, cannot be created, or disallows writing.
                * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                * The device is out of space.
                * The store could not be migrated to the current model version.
                Check the error message to determine what the actual problem was.
                */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
    }
}

????

Answer 1

NSPersistentContainer 有一个 persistentStoreDescriptions 数组，您可以在调用 container.loadPersistentStores 之前修改它。事实上，如果 inMemory 为真，您已经这样做来更改商店的 URL。

所以要设置文件保护选项:

container = NSPersistentContainer(name: "TharmaTrack")
container.persistentStoreDescriptions.first!.setOption(FileProtectionType.complete as NSObject,
                                                       forKey: NSPersistentStoreFileProtectionKey)