Question

我正在开发一个应用程序，用户可以创建带有标题，描述，日期和图片的“内存”。单击“保存”后，内存将保存到用户的内存表视图中。如果用户未添加自己的图像，则有一个默认图片用于记忆。出于某种原因，这些内存已成功保存到Firebase数据库中，但是当用户提交登录到应用程序时，只有带有用户从其照片库添加的图片的内存才是 >未被添加到表视图中，并且具有默认应用程序图片的内存已成功添加到表视图中。

我不知道它是否重要，但是它说：

加载失败，错误为Error Domain = NSURLErrorDomain代码= -999“已取消” UserInfo

有人知道它为什么会发生吗，我该如何解决？

这是装载存储器功能：

func loadMemories() { let UID = Auth.auth().currentUser!.uid // self.ref.child("MEmories").queryOrdered(byChild: "uid").queryEqual(toValue: userID).observe(.value, with: { self.ref.child("MEmories").queryOrdered(byChild: "uid").queryEqual(toValue: UID).observe(.value, with: { snapShot in if let dict = snapShot.value as? NSDictionary { for d in (dict as? Dictionary<String,AnyObject>)! { let title = d.value["title"] as?String let body = d.value["body"] as? String let uid = d.value["uid"] as? String let imageRef = d.value["imageRef"] as? String let date = d.value["date"] as? NSNumber let m = Memory(title: title!, body: body!, uid: uid!,imageRef:imageRef!, date: date!) m.key = d.key let tempImageRef = self.sref.child(m.imageRef) tempImageRef.getData(maxSize: 1*1024*1024, completion: {(data,error) in if error == nil { if let imageData = data { m.image = UIImage(data: imageData) self.memories.append(m) self.tbl.reloadData() } } }) } // copy memories array to the filtered array self.filteredArray = self.memories self.tbl.reloadData() }//end of if self.ref.child("MEmories").removeAllObservers() }) }

Answer 1

将闭包中的if更改为

//image closure
if let imageData = data {
    m.image = UIImage(data: imageData)
    self.memories.append(m)
}
...
//End of outer closure
self.filteredArray = self.memories
DispatchQueue.main.async {
    self.tbl.reloadData()
}

Answer 2

    func loadMemories()

{
   let UID = Auth.auth().currentUser!.uid
   // self.ref.child("MEmories").queryOrdered(byChild: "uid").queryEqual(toValue: userID).observe(.value, with: {
    self.ref.child("MEmories").queryOrdered(byChild: "uid").queryEqual(toValue: UID).observe(.value, with: {

        snapShot in

        if let dict = snapShot.value as? NSDictionary

        {

            for d in (dict as? Dictionary<String,AnyObject>)!

            {

                let title = d.value["title"] as?String

                let body = d.value["body"] as? String

                let uid = d.value["uid"] as? String

                let imageRef = d.value["imageRef"] as? String

                let date = d.value["date"] as? NSNumber


                let m = Memory(title: title!, body: body!, uid: uid!,imageRef:imageRef!, date: date!)

                m.key = d.key

                let tempImageRef = self.sref.child(m.imageRef)


                tempImageRef.getData(maxSize: 1*1024*1024, completion: {(data,error) in

                    print ("imageRef")


                    if error == nil

                    {

                        if let imageData = data

                        {

                            m.image = UIImage(data: imageData)

                            self.memories.append(m)

                            self.tbl.reloadData()

                        }

                    }


                })

            }
            // copy memories array to the filtered array
            self.filteredArray = self.memories
            DispatchQueue.main.async {
                self.tbl.reloadData()
            }

        }//end of if

        self.ref.child("MEmories").removeAllObservers()



    })

}

加载失败，出现错误：Error Domain = NSURLErrorDomain代码= -999“已取消”

2 个答案: