从容器应用程序和扩展程序访问核心数据

Question

我正在开发应用程序和共享扩展程序并尝试使用核心数据。但是，当我在扩展程序中插入项目时，这些项目仅在扩展程序中可见，但在容器应用程序中不可见（例如，我从应用程序执行 NSFetchRequest 并获得零个项目，但在应用程序中我得到 >0）。 我正在使用以下代码获取持久化容器：

lazy var persistentContainer: NSPersistentContainer = {

    let container = NSPersistentContainer(name: "appname")
    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error {

            fatalError("Unresolved error \(error)")
        }
    })
    return container
}()

此外，appname.xcdatamodeld 的目标成员会检查应用程序和扩展程序。 如何为容器应用和扩展正确共享核心数据？

Answer 1

 lazy var persistentContainer: NSPersistentContainer = {
    /*
     The persistent container for the application. This implementation
     creates and returns a container, having loaded the store for the
     application to it. This property is optional since there are legitimate
     error conditions that could cause the creation of the store to fail.
     */
    let container = NSPersistentContainer(name: "xx")

    let appName: String = "xx"
    var persistentStoreDescriptions: NSPersistentStoreDescription

    let storeUrl =  FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.xx.xx.container")!.appendingPathComponent("xx.sqlite")


    let description = NSPersistentStoreDescription()
    description.shouldInferMappingModelAutomatically = true
    description.shouldMigrateStoreAutomatically = true
    description.url = storeUrl

    container.persistentStoreDescriptions = [NSPersistentStoreDescription(url:  FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.xxx.xx.container")!.appendingPathComponent("xx.sqlite"))]

    container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
    })
    return container
}()