小编Jel*_*lly的帖子

更新Xcode 8并将Swift 2项目转换为Swift 3后,其他代码运行良好,但runTransactionBlock无法正常工作,发现此错误:

"runTransactionBlock:在启用持久性时检测到使用情况.请注意,应用程序重新启动时不会保留事务"

可能有什么不对？

Firebase runTransaction Code

postRef.runTransactionBlock({ (currentData: FIRMutableData) -> FIRTransactionResult in
            if var post = currentData.value as? [String : AnyObject], let uid = FIRAuth.auth()?.currentUser?.uid {
                var stars : Dictionary<String, Bool>
                stars = post["likeMap"] as? [String : Bool] ?? [:]
                var likeCount = post["likeCount"] as? Int ?? 0
                if let _ = stars[uid] {
                    // Unstar the post and remove self from stars
                    likeCount -= 1
                    self._liked = false
                    stars.removeValue(forKey: uid)
                } else …