【发布时间】：2017-04-06 19:36:46
【问题描述】：
// 问题解决了 我自己找到了，仍然感谢您的帮助:=)
我尝试构建一个类似 Instagram 的应用程序以用于学习目的。 我可以从 Firebase 上传和检索数据。 当我上传一张新图片时，我将 cmets 的值设置为 0。 因此，当用户 cmets 时，我想更新子项的值（“kommentAnzahl”）+1 以获取新评论，减去 -1 以获取已删除评论（删除并不重要）。这样我就可以让我的标签 anzahlKommentare 在每个帖子下显示用户的 cmets 数量（就像 Instagram 一样）
我的完整代码在下面
class MemesTableViewController: UITableViewController {
var kommentarArray = [FotoComment]()
var dataBaseRef : FIRDatabaseReference!
var storageRef : FIRStorageReference!
var posts = [PostMitBild]()
var segmentedControl : HMSegmentedControl!
override func viewDidLoad() {
super.viewDidLoad()
segmentedControl = HMSegmentedControl(sectionTitles: ["Top Heute", "Beliebteste", "Neue"])
segmentedControl.frame = CGRect(x: 10, y: 10, width: 300, height: 60)
segmentedControl.backgroundColor = UIColor.red
segmentedControl.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
segmentedControl.borderColor = UIColor.brown
segmentedControl.tintColor = UIColor.black
segmentedControl.selectionIndicatorColor = UIColor.gray
segmentedControl.addTarget(self, action: #selector(getter: MemesTableViewController.segmentedControl), for: UIControlEvents.valueChanged)
tableView.tableHeaderView = segmentedControl
segmentedAction()
}
func segmentedAction() {
if segmentedControl.selectedSegmentIndex == 0 {
let postRef = FIRDatabase.database().reference().child("MemesBilder")
postRef.observe(.value, with: { (snapshot) in
var newPost = [PostMitBild]()
for post in snapshot.children {
let Post = PostMitBild(snapshot: post as! FIRDataSnapshot)
newPost.insert(Post, at: 0)
}
self.posts = newPost
DispatchQueue.main.async {
self.tableView.reloadData()
}
}, withCancel: { (error) in
print(error.localizedDescription)
})
}
}
//------------------------------------------
override func viewWillAppear(_ animated: Bool) {
if FIRAuth.auth()?.currentUser == nil {
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Login")
self.present(vc, animated: true, completion: nil)
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell", for: indexPath) as! PostTableViewCell
if let seconds = posts[indexPath.row].postDate {
let timestamp = NSDate(timeIntervalSince1970: seconds)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy HH:mm"
cell.uploadDatum.text = dateFormatter.string(from: timestamp as Date)
}
cell.kommentarZähler.text = String(posts[indexPath.row].kommentarAnzahl)
cell.usernameTextField.text = posts[indexPath.row].username
cell.postContent.text = posts[indexPath.row].content
storageRef = FIRStorage.storage().reference(forURL: posts[indexPath.row].userImageUrlString)
storageRef.data(withMaxSize: 1 * 1024 * 1024, completion: { (data, error) in
if error == nil {
DispatchQueue.main.async {
if let data = data {
cell.UserImageView.image = UIImage (data: data)
}
}
}else {
print(error?.localizedDescription)
}
})
let storageRef2 = FIRStorage.storage().reference(forURL: posts[indexPath.row].PostImageUrlString)
storageRef2.data(withMaxSize: 1 * 1024 * 1024, completion: { (data, error) in
if error == nil {
DispatchQueue.main.async {
if let data = data {
cell.postImageView.image = UIImage (data: data)
}
}
}else {
print(error?.localizedDescription)
}
})
return cell
}
//done!!!! ------------------------------------------
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
tableView.deleteRows(at: [indexPath], with: .fade)
let ref = posts[indexPath.row].ref
ref!.removeValue()
posts.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
}
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
var numberOfRows = 0
switch segmentedControl.selectedSegmentIndex {
case 0 : numberOfRows = posts.count
case 1: numberOfRows = posts.count
default: break
}
return numberOfRows
}
override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 420.00
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segmentedControl.selectedSegmentIndex == 0 {
if segue.identifier == "addComment" {
let vc = segue.destination as! CommentTableViewController
let indexPath = tableView.indexPathForSelectedRow!
vc.selectedPosts = posts[indexPath.row]
}
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if segmentedControl.selectedSegmentIndex == 0 {
performSegue(withIdentifier: "addComment", sender: self)
}
if segmentedControl.selectedSegmentIndex == 1 {
performSegue(withIdentifier: "addComment", sender: self)
}
if segmentedControl.selectedSegmentIndex == 2 {
performSegue(withIdentifier: "addComment", sender: self)
}
}
}
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
import FirebaseStorage
class CommentTableViewController: UITableViewController {
@IBOutlet weak var komentarZähler: UILabel!
@IBOutlet weak var UserImageView: UIImageView!
@IBOutlet weak var usernameTextField: UILabel!
@IBOutlet weak var postImageView: UIImageView!
@IBOutlet weak var postContent: UITextView!
var dataBaseRef : FIRDatabaseReference!
var storageRef : FIRStorageReference!
var commentsArray = [FotoComment]()
var selectedPosts:PostMitBild!
var DataBaseRef : FIRDatabaseReference! {
return FIRDatabase.database().reference()
}
override func viewDidLoad() {
super.viewDidLoad()
configurePost()
let commentRef = selectedPosts.ref!.child("Kommentare")
commentRef.observe(.value, with: { (snapshot) in
var newComments = [FotoComment]()
for item in snapshot.children {
let neuerKommentar = FotoComment(snapshot: item as! FIRDataSnapshot)
newComments.insert(neuerKommentar, at: 0)
}
self.commentsArray = newComments
self.tableView.reloadData()
}, withCancel: { (error) in
print(error.localizedDescription)
})
}
@IBAction func addComment(_ sender: UIBarButtonItem) {
let alertView = UIAlertController(title: "Kommentar", message: "Füge einen Kommentar hinzu", preferredStyle: UIAlertControllerStyle.alert)
alertView.addTextField { (textfield) in
textfield.placeholder = "Einen neuen Kommentar hinzufügen"
}
let sendCommentAction = UIAlertAction(title: "Kommentieren", style: .default) { (action) in
let textfield = alertView.textFields!.first!
let comment = FotoComment(content: textfield.text! , postId: self.selectedPosts.postId , username: (FIRAuth.auth()!.currentUser!.displayName!) , userImageUrlString: String(describing: FIRAuth.auth()!.currentUser!.photoURL!), postDate: (NSDate().timeIntervalSince1970))
let commentRef = self.selectedPosts.ref!.child("Kommentare").childByAutoId()
let myReference = FIRDatabase.database().reference()
myReference.child("MemesBilder").child("kommentarAnzahl").setValue(["kommentarAnzahl": 1])
commentRef.setValue(comment.toAnyObject())
// commentRef.child("kommentarAnzahl").updateChildValues(["kommentarAnzahl" : 1])
}
let cancelAction = UIAlertAction(title: "Abbrechen", style: .cancel, handler: nil)
alertView.addAction(sendCommentAction)
alertView.addAction(cancelAction)
self.present(alertView, animated: true, completion: nil)
}
// 2----------------------------------------------
func configurePost() {
usernameTextField.text = selectedPosts.username
postContent.text = selectedPosts.content
storageRef = FIRStorage.storage().reference(forURL: selectedPosts.userImageUrlString)
storageRef.data(withMaxSize: 1 * 1024 * 1024, completion: { (data, error) in
if error == nil {
DispatchQueue.main.async {
if let data = data {
self.UserImageView.image = UIImage (data: data)
}
}
}else {
print(error?.localizedDescription)
}
})
let storageRef2 = FIRStorage.storage().reference(forURL: selectedPosts.PostImageUrlString)
storageRef2.data(withMaxSize: 1 * 1024 * 1024, completion: { (data, error) in
if error == nil {
DispatchQueue.main.async {
if let data = data {
self.postImageView.image = UIImage (data: data)
}
}
}else {
print(error?.localizedDescription)
}
})
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
komentarZähler.text = "Kommentare: \(commentsArray.count)"
return commentsArray.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "commentCell", for: indexPath) as! CommentTableViewCell
if let seconds = commentsArray[indexPath.row].postDate {
let timestamp = NSDate(timeIntervalSince1970: seconds)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "dd/MM/yyyy HH:mm:ss"
cell.uploadDatum.text = dateFormatter.string(from: timestamp as Date)
}
cell.usernameTextField.text = commentsArray[indexPath.row].username
cell.postContent.text = commentsArray[indexPath.row].content
storageRef = FIRStorage.storage().reference(forURL: commentsArray[indexPath.row].userImageUrlString!)
storageRef.data(withMaxSize: 1 * 1024 * 1024, completion: { (data, error) in
if error == nil {
DispatchQueue.main.async {
if let data = data {
cell.UserImageView.image = UIImage (data: data)
}
self.tableView.reloadData()
}
}else {
print(error?.localizedDescription)
}
})
return cell
}
}
import UIKit
import Firebase
import FirebaseStorage
import FirebaseAuth
import FirebaseDatabase
class AddImageViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIPickerViewDelegate {
@IBOutlet weak var postImage: UIImageView!
@IBOutlet weak var textView: UITextView!
var dataBaseRef : FIRDatabaseReference! {
return FIRDatabase.database().reference()
}
var storageRef : FIRStorageReference! {
return FIRStorage.storage().reference()
}
override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func chooseImage(_ sender: UIButton) {
let pickerController = UIImagePickerController()
pickerController.delegate = self
pickerController.allowsEditing = true
let alertController = UIAlertController(title: "Bild aussuchen", message: "Suche dir dein neues Profilbild aus", preferredStyle: .actionSheet)
let cameraAction = UIAlertAction(title: "Kamera", style: .default, handler: { (action) in
pickerController.sourceType = .camera
self.present(pickerController, animated: true, completion: nil)
})
let photoLibraryAction = UIAlertAction(title: "Fotoalbum", style: .default, handler: { (action) in
pickerController.sourceType = .photoLibrary
self.present(pickerController, animated: true, completion: nil)
})
let safedPhotoAction = UIAlertAction(title: "Fotos", style: .default, handler: { (action) in
pickerController.sourceType = .savedPhotosAlbum
self.present(pickerController, animated: true, completion: nil)
})
let cancelAction = UIAlertAction(title: "Abbrechen", style: .destructive, handler: nil)
alertController.addAction(cameraAction)
alertController.addAction(photoLibraryAction)
alertController.addAction(safedPhotoAction)
alertController.addAction(cancelAction)
present(alertController, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
self.postImage.image = image
self.dismiss(animated: true, completion: nil)
}
@IBAction func SafeAction(_ sender: UIBarButtonItem) {
let data = UIImageJPEGRepresentation(self.postImage.image!, 0.5)
let metadata = FIRStorageMetadata()
metadata.contentType = "image/jpeg"
let postId = "\(FIRAuth.auth()!.currentUser!.uid)\(NSUUID().uuidString)"
let imagePath = "postIMAGES\(postId)/postPic.jpg"
storageRef.child(imagePath).put(data!, metadata: metadata) { (metadata, error) in
if error == nil {
let postRef = self.dataBaseRef.child("MemesBilder").childByAutoId()
let post = PostMitBild(content: self.textView.text!, postId: postId, username: (FIRAuth.auth()?.currentUser?.displayName!)!, PostImageUrlString: String(describing: metadata!.downloadURL()!), userImageUrlString: String(describing: FIRAuth.auth()!.currentUser!.photoURL!), postDate: (NSDate().timeIntervalSince1970), kommentarAnzahl: 0)
postRef.setValue(post.toAnyObject())
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Memes")
self.present(vc, animated: true, completion: nil)
}else {
print(error!.localizedDescription)
}
}
_ = navigationController?.popToRootViewController(animated: true)
}
}
这些是我的 3 个 VC，用于显示图片（MemesTableView）、添加图片（AddImageView）和评论上传的图片（CommentTableView）
在我的 Firebase 结构的下方
这就是我的结构的样子
我想在每次用户 cmets 时将 func "addComment" 中的投票数更新为 1
【问题讨论】：
-
您在问题中包含了 JSON 树的照片。请将其替换为实际的 JSON 作为文本，您可以通过单击 Firebase 数据库控制台中的导出按钮轻松获取该文本。将 JSON 作为文本使其可搜索，让我们可以轻松地使用它来测试您的实际数据并在我们的答案中使用它，一般来说这只是一件好事。
-
witzeapp-4ec48.firebaseio.com 是你的意思吗？ :O 对不起，我是一个绝对的初学者。
-
好吧，我 nils 已经用我的 JSON 树的图片以书面格式更新了它。希望对您有所帮助。
标签： ios swift firebase firebase-realtime-database