objective-c - Swift:无法预加载 Coredata

Question

当我在“目标 - 构建阶段 - 复制捆绑资源”下包含带有 Objective-C 的 SQLite 文件时，该文件将被完全复制到目标，即设备或模拟器。在目标上，我得到了整个文件:表和内容(记录/行)。

用 Swift 做同样的事情，表格将被复制，但它们是空的:没有记录/行。 :-(

我可以做一些额外的事情吗？有什么“绝招”吗？

我如何使用 Swift 将基本记录预加载到我的核心数据？？？

我使用的是 Xcode v6.1.1，与 Beta 6.2 是一样的。

Answer 1

这是我的解决方案(针对 sqlite 文件)。不知道为什么在Swift里这么“奢侈”。也许有更简单的方法？感谢 pbasdf !!!

重要:在 *.sqlite 文件下，您必须将 *.sqlite-shm 和 *.sqlite-wal 添加到您的项目中这个文件会自动添加到“Target - Build Phases - Copy Bundle Resources”

这是基于“AppDelegate.swift”的标准模板…

lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
    // The persistent store coordinator for the application. This implementation creates and return a coordinator, having added 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.
    // Create the coordinator and store
    var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)

    let dataName = „MyData.sqlite" // must be replaced by the name of your file!
    let modelName = „MyData“ // must be replaced by the name of your model!

    let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent(dataName)

    let fileManager = NSFileManager.defaultManager()
    let bundle = NSBundle.mainBundle()
    let fromURL = bundle.URLForResource(modelName, withExtension: "sqlite")

    // check sqlite-file: must it be installed?
    if !fileManager.fileExistsAtPath(url.path!) {
        self.copySqlliteFiles(modelName, databaseName: dataName)
    }

    var error: NSError? = nil
    var failureReason = "There was an error creating or loading the application's saved data."

    if coordinator!.addPersistentStoreWithType(NSSQLiteStoreType, configuration: nil, URL: url, options:  nil, error: &error) == nil {

...

   return coordinator
}()

// MARK: - copy sqllite-files (c) by Ray Wenderlich & Team in „“Core Data by Tutorials“

// check sqlite-files: they must be installed...
func copySqlliteFiles(modelName: String, databaseName: String)
{
    let bundle = NSBundle.mainBundle()

    let baseDatabaseURL = bundle.URLForResource(modelName, withExtension: "sqlite")
    let documentsURL = self.applicationDocumentsDirectory
    let storeURL = documentsURL.URLByAppendingPathComponent(databaseName)
    NSFileManager.defaultManager().copyItemAtURL(baseDatabaseURL!, toURL: storeURL,error: nil)

    let baseSHMURL = bundle.URLForResource(modelName,withExtension: "sqlite-shm")
    let shmURL = self.applicationDocumentsDirectory.URLByAppendingPathComponent(databaseName + "-shm")
    NSFileManager.defaultManager().copyItemAtURL(baseSHMURL!, toURL: shmURL, error: nil)

    let walURL = self.applicationDocumentsDirectory.URLByAppendingPathComponent(databaseName + "-wal")
    let baseWALURL = bundle.URLForResource(modelName, withExtension: "sqlite-wal")
    NSFileManager.defaultManager().copyItemAtURL(baseWALURL!, toURL: walURL, error: nil)
}