swift - iOS10/Swift 3 中的 NSFetchedResultsController - 转换后仍显示错误消息

Question

我正在将 swift 应用程序转换为 3.0，但还剩下一个问题。我已阅读 NSFetchedResultController 现在是通用的所有说明并修改了代码，但仍然收到臭名昭著的“分号”错误。

原代码:

    fileprivate lazy var jobController:NSFetchedResultsController = { () -> <<error type>> in 
        let request = NSFetchRequest(entityName: AGJobData.entityName)
        request.sortDescriptors = [NSSortDescriptor(key: "jobNumber", ascending: true), NSSortDescriptor(key: "name", ascending: true)]
        let controller = NSFetchedResultsController(fetchRequest: request, managedObjectContext: AGDataManager.sharedManager.managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
        var error:NSError? = nil
        controller.performFetch(&error)
        controller.delegate = self
        return controller
        }()

由我修改(手动，XCode 转换器没有触及这段代码):

    fileprivate lazy var jobController:NSFetchedResultsController<AGJobData>= { () -> <<error type>> in
    let request = NSFetchRequest<AGJobData>()
    request.sortDescriptors = [NSSortDescriptor(key: "jobNumber", ascending: true), NSSortDescriptor(key: "name", ascending: true)]
    let controller = NSFetchedResultsController(fetchRequest: request, managedObjectContext: AGDataManager.sharedManager.managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
    var error:NSError? = nil
    controller.performFetch(&error)
    controller.delegate = self
    return controller
    }()

还有什么想法吗？

Answer 1

错误处理也已更改。

fileprivate lazy var jobController : NSFetchedResultsController<AGJobData> = {        
   let request = NSFetchRequest<AGJobData>()
   request.sortDescriptors = [NSSortDescriptor(key: "jobNumber", ascending: true), NSSortDescriptor(key: "name", ascending: true)]
   let controller = NSFetchedResultsController(fetchRequest: request, managedObjectContext: AGDataManager.sharedManager.managedObjectContext, sectionNameKeyPath: nil, cacheName: nil)
   controller.delegate = self
   do {
      try controller.performFetch(&error)
   } catch {
      print(error)
   }     
   return controller
}()

可能是您必须将 NSFetchRequest 行更改为

let request = NSFetchRequest<AGJobData>(entityName: "AGJobData")

文字字符串必须是实体的名称。