SWIFT 之CoreData初試

SWIFT中使用CoreData來保存本地數據，在建立項目的時候把 "Use Core Data"選項選上

項目建立完成后點擊后綴為 .xcdatamodeld的那個文件，點擊右下角"Add Entity"添加一個Entity后可以修改其名稱，接着在"Attributes"下面點擊“+”號添加一個

Attribute

 

 

接着就可以上代碼操作了，首先先添加引用

import CoreData

//It's necessary to code these two rows if you want to use CoreData

var applicationDelegate = UIApplication.sharedApplication().delegate as AppDelegate

var managedObjectContext = applicationDelegate.managedObjectContext

//Get the entity by entityName        

var entity = NSEntityDescription.entityForName("Notes", inManagedObjectContext: managedObjectContext!)

//Get the ManagedObject

var title = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: managedObjectContext)

//Set the ManagedObject Value for key

title.setValue(text, forKey: "title")

 

var error: NSError?

//Save content

if(managedObjectContext?.save(&error) == nil){

 }

 

//Get data from the CoreData

var applicationDelegate = UIApplication.sharedApplication().delegate as AppDelegate

var managedObjectContext = applicationDelegate.managedObjectContext

var fetchRequest = NSFetchRequest(entityName: "Notes")

        

var error:NSError?

var fetchResults = managedObjectContext?.executeFetchRequest(fetchRequest, error: &error) as [NSManagedObject]?

if let results = fetchResults{

      var  notes = results

}else{

        println(error)

}