我需要一个NSManagedObject和一个常规NSObject的共享接口.在
Objective-c中,我可以使用协议来实现这一目标.但是在Swift中我得到了这个运行时错误.任何方案？提前致谢！
协议产品{
var code：String {get set}
var sp：String {get set}
}
class Stock: NSManagedObject,Product {
@NSManaged var code: String
@NSManaged var sp: String
}
错误：架构i386的未定义符号：
“__TFC11YellowPages5Stockg2spSS”,引自：
Stock.o中的__TFC11YellowPages5Stockm2spSS
“__TFC11YellowPages5Stockg4codeSS”,引自：
Stock.o中的__TFC11YellowPages5Stockm4codeSS
ld：找不到架构i386的符号
clang：错误：链接器命令失败,退出代码为1(使用-v查看调用)
解决方法
这对我有用.亲自尝试一下,看看它是否有效：
class MyEntity: NSManagedObject {
@NSManaged var testAttribute: String
}
@objc
protocol MyProtocol {
var testAttribute: String { get set }
}
extension MyEntity: MyProtocol { }
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
let myContext = appDelegate.managedObjectContext!
let entity: MyEntity = NSEntityDescription.insertNewObjectForEntityForName("MyEntity",inManagedObjectContext: myContext) as MyEntity
foo(entity)
println(entity.testAttribute)
}
func foo(var object: MyProtocol) {
object.testAttribute = "bar"
}
}
下面也有用,但我认为以上是更好的方法：
@objc
protocol MyProtocol {
var testAttribute: String { get set }
}
class MyEntity: NSManagedObject,MyProtocol {
@NSManaged var testAttribute: String
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let appDelegate = UIApplication.sharedApplication().delegate as AppDelegate
let myContext = appDelegate.managedObjectContext!
let entity: MyEntity = NSEntityDescription.insertNewObjectForEntityForName("MyEntity",inManagedObjectContext: myContext) as MyEntity
foo(entity)
println(entity.testAttribute)
}
func foo(var object: MyProtocol) {
object.testAttribute = "bar"
}
}
