“在使用Parse之前，必須向registerSubclass注冊PFUser類。”

Question

我環顧四周，所有其他答案對我均不起作用，我正在嘗試查詢PFUser，但我不斷收到“在使用Parse之前，必須向registerSubclass注冊PFUser類”的異常。

這是發生問題的地方：

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]
}

知道我在這里可能會缺少什么嗎？ 我在另一個文件中執行了此操作，但沒有該問題。 所以我有點困惑。

編輯：

像這樣？

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

子類的注冊方式似乎存在問題。

使用以下更新您的PFUser子類

class TradeUser : PFUser {

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

    ...
}