'The class PFUser must be registered with registerSubclass before using Parse.'

Question

我已经环顾四周，所有其他答案都不适合我，我试图查询PFUser，但我一直得到一个异常'类PFUser必须在使用Parse之前注册registerSubclass。'

这就是问题发生的地方:

override func collectionView(collectionView: JSQMessagesCollectionView!, avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
    let message = messages[indexPath.item]
    if self.avatars[message.senderId] == nil {
        var imageView = JSQMessagesAvatarImage(placeholder: UIImage(named: "profile"))
        self.avatars[message.senderId] = imageView
        let user = users[message.senderId]!
        print(user)
        var parseAvatar = PFFile()
        PFUser.registerSubclass()
        let imageQuery = PFUser.query()
        imageQuery?.whereKey("objectId", equalTo: user.objectId!)
        imageQuery?.limit = 1
        imageQuery?.findObjectsInBackgroundWithBlock({ (images: [AnyObject]?, error: NSError?) -> Void in
            if imageQuery?.countObjects() == 0 {
                return
            } else {
                for image in images! {
                    if image.objectForKey("profileImage") == nil {
                        return
                    } else {
                        let userPic = image.objectForKey("profileImage") as! PFFile
                        userPic.getDataInBackgroundWithBlock({ (imageData: NSData?, error: NSError?) -> Void in
                            if (error == nil) {
                                let image = UIImage(data: imageData!)
                                imageView.avatarImage = JSQMessagesAvatarImageFactory.circularAvatarImage(UIImage(data: imageData!), withDiameter: 30)
                            }
                        })
                    }
                }
            }
        })
            // Reload entire table now that the avatar is downloaded
            self.collectionView?.reloadData()
        }
    return self.avatars[message.senderId]
}

你知道我遗漏了什么吗?我在另一个文件中做了这个，它没有这个问题。所以我有点困惑。

编辑:

呢?

import Foundation
import Parse
class TradeUser : PFUser {
override class func initialize() {
    self.registerSubclass()
}
var userID : String {
    get {return objectForKey("objectId") as! String}
    set { setObject(newValue, forKey: "objectId") }
}
var emailAddress : String {
    get {return objectForKey("email") as! String}
    set { setObject(newValue, forKey: "email") }
}
var firstName : String {
    get {return objectForKey("firstName") as! String}
    set {setObject(newValue, forKey: "firstName")}
}
var lastName : String {
    get {return objectForKey("lastName") as! String}
    set {setObject(newValue, forKey: "lastName")}
}
var primaryQueue : String {
    get {return objectForKey("primaryQueue") as! String}
    set {setObject(newValue, forKey: "primaryQueue")}
}
var image : PFFile {
    get { return self["profileImage"] as! PFFile }
    set { self["profileImage"] = newValue }
}

}

Answer 1

似乎存在如何注册子类的问题。

用下面的

更新你的PFUser子类

class TradeUser : PFUser {
    override class func initialize() {
        struct Static {
            static var onceToken : dispatch_once_t = 0;
        }
        dispatch_once(&Static.onceToken) {
            self.registerSubclass()
        }
    }
    ...
}