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刚看swift开发IOS，在使用Core Data框架时遇到了一个问题，控制台打出的log 如下：
CoreData: warning: Unable to load class named 'CollectNews' for entity 'CollectNews'. Class not found, using default NSManagedObject instead.
百思不得其解
，后来在StackOverFlow上找到了一种解决办法，就是在Model类的开关加上这个的注解：
@objc(CollectNews)
Demo的部分代码分享给大家，仅做参考：
Model类
import Foundation
import CoreData
@objc(CollectNews) class CollectNews: NSManagedObject { @NSManaged var date: NSNumber @NSManaged var newsId: NSNumber }
AppDelegate类：
func application(application: UIApplication!, didFinishLaunchingWithOptions launchOptions: NSDictionary!) -> Bool { insertData() selectData() return true } //插入数据 func insertData(){ //取Entity对象 var collectNews = NSEntityDescription.insertNewObjectForEntityForName("CollectNews", inManagedObjectContext: self.managedObjectContext) as CollectNews //对属性进行修改 collectNews.newsId = 12 collectNews.date = 20140805 //保存 if self.managedObjectContext.hasChanges{ self.managedObjectContext.save(nil) } } //查询 func selectData(){ //得request对象 var request = NSFetchRequest() var entityQueue = NSEntityDescription.entityForName("CollectNews", inManagedObjectContext: self.managedObjectContext) request.entity = entityQueue var errorInfo:NSError? //取结果集 var resultArr = self.managedObjectContext.executeFetchRequest(request, error: &errorInfo) as NSArray println("----》\(resultArr.count)") var temp = resultArr[0] as CollectNews println("--->\(temp.newsId)") }