ios - 如何在 xmppGroupCoreDataStorageObject 中保存和获取？

Question

使用 xmpp-messenger-ios，我创建了组并设置了它的配置并将用户添加到其中，然后我想将组添加到 xmppGroupCoreDataStorageObject存储以将其列到 OpenChatViewController TableView 中。

我如何将组数据保存到 xmppGroupCoreDataStorageObject:

public class func addUserInCoreData(jid:String, users: Set<NSObject>) {

        let moc = OneRoster.sharedInstance.managedObjectContext_roster() as NSManagedObjectContext?
        let entity = NSEntityDescription.entityForName("XMPPGroupCoreDataStorageObject", inManagedObjectContext: moc!)
        let person = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: moc!)
        person.setValue(jid, forKey: "name")
        person.setValue(users, forKey: "users") // Code breaks here.
        print(moc.debugDescription)

        do{
            try moc?.save()
            let sucess = XMPPGroupCoreDataStorageObject.insertGroupName(jid, inManagedObjectContext: moc)
            print(sucess)
        }
        catch let error{
            print(error)
        }

    }

遇到异常:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString managedObjectContext]: unrecognized selector sent to instance 0x7fdf8c545e50'***

这是框架实现:

@property (nonatomic, strong) NSString * name;
@property (nonatomic, strong) NSSet* users;

Answer 1

那么，您正在尝试将消息发送到无法响应它的对象。
查看您的异常日志:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString managedObjectContext]: unrecognized selector sent to instance 0x7fdf8c545e50'***  

managedObjectContext 消息已发送到 NSString 类的实例。
当然，它无法响应它，您正在崩溃。