【发布时间】:2016-09-13 21:28:56
【问题描述】:
我有一个使用 Xcode 8 GM 种子在 Swift 3 中构建的应用程序。该应用程序有一个键盘扩展。我将共享组目录用于 sqlite db 位置,并且使用框架完成数据库访问。在我尝试从键盘调用 SaveContext() 之前,一切正常。我收到标题错误代码=134030 中提到的错误。消息显示“保存时发生错误”并且没有其他信息。我没有 userInfo 来解决潜在的错误。
我已经转储了一些调试信息,以确保我正在查看我正在尝试更新的同一项目的同一实例。这是一个非常简单的更新,只是在使用某些东西时增加一个使用计数器。从键盘扩展保存有什么问题吗?它们是否以只读模式打开?
这是 CoreDataStack 的大部分内容:
let coreDataStack = CoreDataStack()
public class CoreDataStack {
public func saveContext()
{
let context = persistentContainer.viewContext
if context.hasChanges {
do {
try context.save()
} catch let error {
// 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.
let nserror = error as NSError
fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
}
}
}
// MARK: - Private
lazy var managedObjectContext: NSManagedObjectContext = {
return self.persistentContainer.viewContext
}()
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 modelUrl = Bundle(identifier: "com.myapp.AppDataKit")?.url(forResource: "MyApp-SE", withExtension: "momd")
let managedObjectModel = NSManagedObjectModel(contentsOf: modelUrl!)!
let container = NSPersistentContainer(name: "MyApp-SE", managedObjectModel: managedObjectModel)
container.persistentStoreDescriptions = [NSPersistentStoreDescription(url: try! FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: "group.com.myapp")!.appendingPathComponent("MyAppSEData.sqlite"))]
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)")
}
})
return container
}()
} // class CoreDataStack
在 catch 中,我正在检查错误,但无法从中获取更多信息。将其转换为 NSError 后,它仍然无济于事,因为 userInfo 是一个空字典。 我还没有实现错误处理,但是我可以看到键盘中的项目,所以检索没有问题。只有保存时才会崩溃。 我尝试更新的地方非常简单:
item.useCount = NSNumber(value: item.useCount.intValue + 1)
Logger.add(item.debugDescription)
AppData.SaveContext()
AppData 是一个具有访问核心数据的静态函数的类
public class AppData {
public static func SaveContext() {
coreDataStack.saveContext()
}
...
}
我查看了设备日志,但没有得到任何更好的信息。我可以在我的数据包中看到两行,然后在 libswiftCore.dylib 中看到两行
0 libswiftCore.dylib 0x0000000100ab2848 0x100a80000 + 206920
1 libswiftCore.dylib 0x0000000100ab2848 0x100a80000 + 206920
有人知道如何在 Xcode8 中符号化 libswiftcore 吗?
谢谢, 迈克
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