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我正在嘗試從我的數據庫中進行一次抓取以填充集合視圖，按照最新的順序從頂部到最舊。我嘗試使用snap.children.allObjects.reversed()，但我的應用程序在加載時崩潰。下面是完整的提取功能：嘗試使用.reversed（）對Firebase進行排序時發生崩潰
func fetchPosts() {
let ref = FIRDatabase.database().reference()
ref.child("users").queryOrderedByKey().observe(.value, with: { snapshot in
let users = snapshot.value as! [String : AnyObject]
for (_, value) in users {
if let uid = value["uid"] as? String {
if uid == FIRAuth.auth()?.currentUser?.uid {
if let followingUsers = value["following"] as? [String : String] {
for (_, user) in followingUsers {
self.following.append(user)
}
}
self.following.append(FIRAuth.auth()!.currentUser!.uid)
ref.child("posts").queryOrderedByKey().observeSingleEvent(of: .value, with: { (snap) in
for postSnapshot in snap.children.allObjects.reversed() as! [FIRDataSnapshot] {
let value = postSnapshot.value as! [String : AnyObject]
if let userID = value["userID"] as? String {
for each in self.following {
if each == userID {
let posst = Post()
if let poster = value["poster"] as? String, let likes = value["likes"] as? Int, let pathToImage = value["pathToImage"] as? String, let postID = value["postID"] as? String {
posst.poster = poster
posst.likes = likes
posst.pathToImage = pathToImage
posst.postID = postID
posst.userID = userID
if let people = value["peopleWhoLike"] as? [String : AnyObject] {
for (_, person) in people {
posst.peopleWhoLike.append(person as! String)
}
}
posts.append(posst)
}
}
}
self.collectionView.reloadData()
}
}
})
ref.removeAllObservers()
}
}
}
})
}
的錯誤是EXC_BAD_INSTRUCTION (code=EXC_1386_INVOP, subcode=0x0)，從 'ReversedRandomAccessCollection < [任何]>'（又名 'ReversedRandomAccessCollection>'）無關型 '[FIRDataSnapshot]' 警告演員總是失敗。
是.reversed不是這樣的嗎？實際上，我的代碼沒有.reversed按從頂部最舊的順序到最底部的順序加載帖子。我怎樣才能切換它？
編輯：帖子的火力地堡片段：
"posts" : {
"-KfWzWv8rP38bUreDupj" : {
"likes" : 1,
"pathToImage" : "https://firebasestorage.googleapis.com/v0/b/cloudcamerattt.appspot.com/o/posts%2F1JSgke8QqFds4CxF2Z4MhuzbRoW2%2F-KfWzWv8rP38bUreDupj.jpg?alt=media&token=fef86bea-1ae2-4e1e-82fa-6209bc281a5e",
"peopleWhoLike" : {
"-KfX29jTcwaQDpkdIVX8" : "yI6NokUl2mTa7Uah4SgtAiulTJH2",
"-KfXQJBRemZUCI2ieT94" : "MpnGvQj7ZOdz12zKD0bTeX1kp0B3"
},
"postID" : "-KfWzWv8rP38bUreDupj",
"poster" : "Harry Potter",
"userID" : "1JSgke8QqFds4CxF2Z4MhuzbRoW2"
},
編輯2：添加時間戳
新增var timestamp: Int!我Post對象，然後將其添加到我的上傳功能：
func uploadToFirebase() {
AppDelegate.instance().showActivityIndicator()
let uid = FIRAuth.auth()!.currentUser!.uid
let ref = FIRDatabase.database().reference()
let storage = FIRStorage.storage().reference(forURL: "gs://cloudcamerattt.appspot.com")
let key = ref.child("posts").childByAutoId().key
let imageRef = storage.child("posts").child(uid).child("\(key).jpg")
let data = UIImageJPEGRepresentation(self.previewImage.image!, 0.6)
var Timestamp: TimeInterval {
return NSDate().timeIntervalSince1970 * 1000
}
let uploadTask = imageRef.put(data!, metadata: nil) { (metadata, error) in
if error != nil {
print(error!.localizedDescription)
AppDelegate.instance().dismissActivityIndicator()
return
}
imageRef.downloadURL(completion: { (url, error) in
if let url = url {
let feed = ["userID" : uid,
"pathToImage" : url.absoluteString,
"likes" : 0,
"poster" : FIRAuth.auth()!.currentUser!.displayName!,
"postID" : key,
"timestamp" : (0-Timestamp)] as [String : Any]
let postFeed = ["\(key)" : feed]
ref.child("posts").updateChildValues(postFeed)
AppDelegate.instance().dismissActivityIndicator()
let feedController = self.storyboard?.instantiateViewController(withIdentifier: "feedVC") as! FeedViewController
feedController.navigationItem.setHidesBackButton(true, animated: false)
self.tabBarController?.selectedIndex = 0
}
})
}
uploadTask.resume()
}
然後將其添加到我的提取中：
let posst = Post()
if let poster = value["poster"] as? String, let likes = value["likes"] as? Int, let pathToImage = value["pathToImage"] as? String, let postID = value["postID"] as? String, let timestamp = value["timestamp"] as? Int {
posst.poster = poster
posst.likes = likes
posst.pathToImage = pathToImage
posst.postID = postID
posst.userID = userID
posst.timestamp = timestamp
更新抓取功能（在崩潰Could not cast value of type 'FIRDataSnapshot' (0x10584eee8) to 'NSArray' (0x107b43dd8).結果）：
func fetchPosts() {
let ref = FIRDatabase.database().reference()
ref.child("users").queryOrderedByKey().observe(.value, with: { snapshot in
let users = snapshot.value as! [String : AnyObject]
for (_, value) in users {
if let uid = value["uid"] as? String {
if uid == FIRAuth.auth()?.currentUser?.uid {
if let followingUsers = value["following"] as? [String : String] {
for (_, user) in followingUsers {
self.following.append(user)
}
}
self.following.append(FIRAuth.auth()!.currentUser!.uid)
for child in snapshot.children.reversed() {
let snap = child as! [FIRDataSnapshot]
ref.child("posts").queryOrdered(byChild: "timestamp").observeSingleEvent(of: .value, with: { (snap) in
if let userID = value["userID"] as? String {
for each in self.following {
if each == userID {
let posst = Post()
if let poster = value["poster"] as? String, let likes = value["likes"] as? Int, let pathToImage = value["pathToImage"] as? String, let postID = value["postID"] as? String, let timestamp = value["timestamp"] as? Int {
posst.poster = poster
posst.likes = likes
posst.pathToImage = pathToImage
posst.postID = postID
posst.userID = userID
posst.timestamp = timestamp
if let people = value["peopleWhoLike"] as? [String : AnyObject] {
for (_, person) in people {
posst.peopleWhoLike.append(person as! String)
}
}
posts.append(posst)
}
}
}
self.collectionView.reloadData()
}
})
}
ref.removeAllObservers()
}
}
}
})
}
在您的問題中發佈Firebase結構的片段通常是一個好主意;作爲*文字*請，沒有圖像。您可以通過Firebase控制檯中的導出（右上角的三個點）功能將該JSON結構顯示爲文本。 – Jay
@Jay抱歉，我現在正在添加一個片段 - 我在猜測「帖子」（這是抓取的內容來填充Feed）？ – KingTim