SWIFT 之CoreData初试

SWIFT中使用CoreData来保存本地数据，在建立项目的时候把 "Use Core Data"选项选上

项目建立完成后点击后缀为 .xcdatamodeld的那个文件，点击右下角"Add Entity"添加一个Entity后可以修改其名称，接着在"Attributes"下面点击“+”号添加一个

Attribute

接着就可以上代码操作了，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)

}