核心數據/ Swift 3.0

Question

這是一個已經工作了很長時間的函數（非常有用於將信息插入到核心數據中）。自從我搬到Swift 3.0後，它遇到了麻煩，在第一行崩潰。我錯過了什麼？

func insertObject<T:NSManagedObject>(_ entity:T.Type, dico:NSDictionary, notification:String!) -> NSManagedObject? { 
    let entityName = entity.entityName 
    let newItem = NSEntityDescription.insertNewObject(forEntityName: entityName, into:managedObjectContext!) as! T 

    for (key, value) in dico { 
     if let value:AnyObject = value as AnyObject? { 
      (newItem as NSManagedObject).setValue(value, forKey: key as! String) 
     } 
    } 

    do {try managedObjectContext!.save() 
     // We may send a notification: 
     if (notification != nil) 
     {NotificationCenter.default.post(name: Notification.Name(rawValue: notification), object: nil)} 
    } catch let error as NSError {print(error)} 

    return newItem 
} 

身邊我得到這個錯誤在調試器控制檯：

fatal error: Index out of range 

而且我可以看到下面的，與彙編代碼一起：

0x1007811f8 <+116>: bl  0x100674b80    ; function signature specialization <preserving fragile attribute, Arg[1] = [Closure Propagated : reabstraction thunk helper from @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) ->() to @callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) -> (@out()), Argument Types : [@callee_owned (@unowned Swift.UnsafeBufferPointer<Swift.UInt8>) ->()]> of generic specialization <preserving fragile attribute,()> of Swift.StaticString.withUTF8Buffer <A> ((Swift.UnsafeBufferPointer<Swift.UInt8>) -> A) -> A 
-> 0x1007811fc <+120>: brk #0x1 

Answer 1

，如果你想保存核心數據庫中的數據可以使用下面的代碼。

步驟1：聲明這3變量如下提及：

let appDelegate = UIApplication.shared.delegate as! AppDelegate 

var managedContext:NSManagedObjectContext! 

var entity:NSEntityDescription! 

步驟2：可以把在viewdidlode這個代碼（），或在您用於保存數據功能。

managedContext = appDelegate.persistentContainer.viewContext 

entity = NSEntityDescription.entity(forEntityName: "Student", in: managedContext) 

let storeStudent = NSManagedObject.init(entity: entity, insertInto: managedContext) 

     storeStudent.setValue(1, forKey: "rollno") 
     storeStudent.setValue("Anil", forKey: "name") 
     storeStudent.setValue("abc street", forKey: "address") 

     do { 
      try managedContext.save() 
     } catch let error as Error! { 
      print(error.localizedDescription) 
     }