此视图控制器有两个孩子，同一个类型有两个实例。该孩子有一个表格视图和一个指示是否收藏夹的按钮，当单击该按钮时，按钮的更改为预期的tincolor，但第二个孩子没有像预期的那样重新加载数据。
Module not found: Error: Can't resolve 'sass-loader' in
'/data/development ...
现在在父视图控制器中，协议功能实现
protocol favoritesUpdate{
func uppdateFavorites()
}
class chatListViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
var type: Bool?
var data:[message]?
var filter: [Chat] = []//[NSManagedObject] = []
let rootRef = Database.database().reference()
let chatsRef = Database.database().reference(withPath: "chats")
var chats: [Chat] = []
//let appDelegate =
var isfilter = false
var controllername: String?
var delegate: favoritesUpdate?
let managedContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
lazy private var backgroundViewWhenDataIsEmpty: UIView = { return UINib(nibName: "nochat", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! UIView }()
override func viewDidLoad() {
super.viewDidLoad()
print("type is \(type) in \(controllername)")
self.tableView.dataSource = self
self.tableView.delegate = self
tableView.backgroundView = UIImageView(image: #imageLiteral(resourceName: "Fondo chat"))
tableView.backgroundView?.alpha = 0.49
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
print("ya aparecio")
self.readUserFromCD({ [weak self] _ in
self?.tableView.reloadData()
if type!{
print("observing chats")
observeChat()
}
})
}
func readUserFromCD(_ completion:(_ data: Bool)->Void){
let fetchRequest = NSFetchRequest<Chat>(entityName: "Chat")
do {
if type == false{
let temp = try managedContext.fetch(fetchRequest)
self.chats = temp.filter({
//$0.value(forKey: "favorite") as! Bool == true
if let value = $0.value(forKeyPath: "favorite"){
if value as! Bool == true {
return true
}
}
return false//if != nil &&
})
//self.tableView.reloadData()
}else{
self.chats = try managedContext.fetch(fetchRequest)
print(self.chats.count)
}
print("mostrando los valores de user \(chats)")
completion(true)
} catch {
print("Could not fetch. \(error.localizedDescription)")
completion(false)
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("isFilter \(isfilter)")
if !isfilter && chats.count > 0{
tableView.backgroundView?.removeFromSuperview()
tableView.backgroundView = UIImageView(image: #imageLiteral(resourceName: "Fondo chat"))
tableView.separatorStyle = .singleLine
return chats.count
}else if isfilter && filter.count > 0{
tableView.backgroundView?.removeFromSuperview()
tableView.backgroundView = UIImageView(image: #imageLiteral(resourceName: "Fondo chat"))
tableView.separatorStyle = .singleLine
return filter.count
}else{
tableView.separatorStyle = .none
showBackgroundIfEmpty()
}
return 0
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! chatsTableViewCell
var user: NSManagedObject!
if !isfilter{
user = chats[indexPath.row]
}else{
user = filter[indexPath.row]
}
cell.backgroundColor = .clear
cell.imagen.sd_cancelCurrentImageLoad()
cell.imagen.layer.borderWidth = 1.0
cell.imagen.layer.borderColor = lightBlue.cgColor
cell.imagen.layer.cornerRadius = cell.imagen.frame.width / 2
cell.imagen.clipsToBounds = true
cell.imagen.contentMode = .center
if let url = user.value(forKey: "url") as? String{
print("there is a image")
//cell.imagen.sd_setHighlightedImage(with: URL(string: url), options: .progressiveDownload, completed: nil)
cell.imagen.sd_setImage(with: URL(string: url), placeholderImage: #imageLiteral(resourceName: "ico_perfil"), options: .progressiveDownload, completed: nil)
cell.imagen.contentMode = .scaleToFill
}else{
print("there is not image")
cell.imagen.contentMode = .center
}
if let name = user.value(forKey: "name") as? String{
cell.name.text = name
}
if let message = user.value(forKey: "message") as? String{
cell.conversation.text = message
}
if let favorite = user.value(forKey: "favorite") as? Bool{
if favorite{
cell.favorites.tintColor = lightBlue
}
}
cell.favorites.tag = indexPath.row
//chats[indexPath.row].value(forKey: "favorite") as? Bool == true ? (cell.favorites.tintColor = lightBlue) : (cell.favorites.tintColor = grey)
cell.favorites.contentEdgeInsets = UIEdgeInsetsMake(10, 10, 10, 10);
cell.favorites.addTarget(self, action: #selector(self.setFavorite(_:)), for: .touchUpInside)
return cell
}
func observeChat(){
var key: String?
Constants.refs.databaseChats.observe(.childAdded, with: { [weak self] snapshot in
print("the key \(snapshot.key) y \(snapshot.key.contains(String(requestManager.instance.user.id!)))")
if snapshot.key.contains(String(requestManager.instance.user.id!)){
key = snapshot.key
if let snap = snapshot.children.allObjects as? [DataSnapshot]{
if let last = snap.last{
if let dat = last.value as? [String: Any]{
//let id = dat["id"] as! String
var message = dat["body"] as? String
let senderId = dat["senderId"] as! String
let recipientId = dat["recipientId"] as! String
var userid = ""
var name: String?
var preurl: String?
let id = snapshot.key
if recipientId != requestManager.instance.user.id!.description && senderId == requestManager.instance.user.id!.description{
userid = recipientId
if dat["attachmentType"] as? Int == 2 {
message = "le envio una imagen"
}
}else if recipientId == requestManager.instance.user.id!.description && senderId != requestManager.instance.user.id!.description {
userid = senderId
if dat["attachmentType"] as? Int == 2 {
message = "envió una imagen"
}
}
Constants.refs.databaseUser.child(userid).observeSingleEvent(of: .value, with: {snap in
print(snap.value as Any)
let da = snap.value as! [String: Any]
name = da["name"] as? String
preurl = da["image"] as? String
self?.setChats(id: id, name: name!, message: message!, preurl: preurl!, key: id)
})
}
}
}
}
})
}
func setChats(id: String, name: String, message: String, preurl: String, key: String){
print("values recibed \(name), \(message),\(preurl),\(key),\(id)")
print("type is \(type) in \(controllername)")
if type!{
print("aqui llego")
var miChat: Chat?
//let managedContext = self.appDelegate.persistentContainer.viewContext
let fetchRequest: NSFetchRequest<Chat> = Chat.fetchRequest()
fetchRequest.predicate = NSPredicate(format: "id = %@", id)//NSPredicate(format: "%K == %@", #keyPath(Chat.id), self.id!)
do {
let results = try managedContext.fetch(fetchRequest)
if results.count > 0 {
print("chat Found")
miChat = results.first
miChat?.message = message
print("mi chat is \(miChat)")
try managedContext.save()
DispatchQueue.main.async {
print("the values in \(self.chats.count)")
self.tableView.reloadData()
}
// self.tableView.reloadData()
} else {
// Fido not found, create Fido
print("not found \(id)")
miChat = Chat(context: managedContext)
miChat?.id = id
miChat?.name = name
miChat?.message = message
miChat?.url = preurl
miChat?.key = key
print(miChat)
try managedContext.save()
DispatchQueue.main.async {
print("the values in \(self.chats.count)")
self.tableView.reloadData()
}
// self.tableView.reloadData()
}
} catch let error as NSError {
print("Fetch error: \(error) description: \(error.userInfo)")
}
}else{
print("no type")
}
}
@objc func setFavorite(_ sender: UIButton){
let value = self.chats[sender.tag].value(forKey: "favorite") as? Bool
value == true ? (sender.tintColor = lightBlue) : (sender.tintColor = grey)
self.chats[sender.tag].setValue(!value!, forKey: "favorite")
//let managedContext = self.appDelegate.persistentContainer.viewContext
do{
try managedContext.save()
self.delegate?.uppdateFavorites()
}catch{
print(error.localizedDescription)
}
}
但是更新没有发生。实现这一目标的最佳方法是什么。 编辑：问题然后成为零的代表