將語法轉換爲swift 3.0 NSFetchedResultsController

Question

如何將我的NSFetchedResultsController轉換爲swift 3.0，我無法讓它工作....我試過蘋果的自動轉換，但它不工作？

我有這樣的：

lazy var fetchedResultsControler: NSFetchedResultsController = { 
    let fetchRequest = NSFetchRequest(entityName: "Mesages") 
    fetchRequest.sortDescriptors = [NSSortDescriptor(key: "timestamp", ascending: true)] 
    fetchRequest.predicate = NSPredicate(format: "user.id = %@", self.friend!.id!) 
    let moc = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext 
    let frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: moc, sectionNameKeyPath: nil, cacheName: nil) 
    frc.delegate = self 
    return frc 
}() 

自動轉換成這樣：

lazy var fetchedResultsControler: NSFetchedResultsController = {() -> <<error type>> in 
    let fetchRequest = NSFetchRequest(entityName: "Mesages") 
    fetchRequest.sortDescriptors = [NSSortDescriptor(key: "timestamp", ascending: true)] 
    fetchRequest.predicate = NSPredicate(format: "user.id = %@", self.friend!.id!) 
    let moc = (UIApplication.shared.delegate as! AppDelegate).managedObjectContext 
    let frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: moc, sectionNameKeyPath: nil, cacheName: nil) 
    frc.delegate = self 
    return frc 
}() 

，但它不工作，它要求我把半冒號在隨機的地方

Answer 1

需要它來在括號內設置NSFetchRequestResult> <>。

對於SWIFT 3.0：

lazy var fetchedResultsControler: NSFetchedResultsController<NSFetchRequestResult> = { 
    let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "Mesages") 
    fetchRequest.sortDescriptors = [NSSortDescriptor(key: "timestamp", ascending: true)] 
    fetchRequest.predicate = NSPredicate(format: "user.id = %@", self.friend!.id!) 
    let moc = (UIApplication.shared.delegate as! AppDelegate).managedObjectContext 
    let frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: moc, sectionNameKeyPath: nil, cacheName: nil) 
    frc.delegate = self 
    return frc 
}()