firebase更新我的表视图时的ios通知
我想在表视图更新时通知用户。我正在使用firebase,但我希望在tableview更新时收到本地通知。我不知道如何设置tableview更新时的触发器。我读了所有我能读的文件,但我弄不懂。下面链接了我的代码,供我设置通知时参考。我只是不知道如何在tableview更新时添加通知firebase更新我的表视图时的ios通知,ios,firebase,firebase-realtime-database,swift4.1,Ios,Firebase,Firebase Realtime Database,Swift4.1,我想在表视图更新时通知用户。我正在使用firebase,但我希望在tableview更新时收到本地通知。我不知道如何设置tableview更新时的触发器。我读了所有我能读的文件,但我弄不懂。下面链接了我的代码,供我设置通知时参考。我只是不知道如何在tableview更新时添加通知 import UIKit import FirebaseAuth import FirebaseDatabase import UserNotifications class ViewController: UIVi
import UIKit
import FirebaseAuth
import FirebaseDatabase
import UserNotifications
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView!
var ref: DatabaseReference!
var databaseHandle:DatabaseHandle?
var postData = [String]()
override func viewWillLayoutSubviews() {
self.navigationController?.isNavigationBarHidden = false
}
override func viewDidLoad() {
super.viewDidLoad()
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: {didAllow, error in
})
ref = Database.database().reference()
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view, typically from a nib.
databaseHandle = ref.child("Posts").observe(.childAdded) { (snapshot) in
let post = snapshot.value as? String
if let actualPost = post {
self.postData.append(actualPost)
self.tableView.reloadData()
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return postData.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "postCell")
cell?.textLabel?.text = postData[indexPath.row]
return cell!
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == UITableViewCellEditingStyle.delete) {
// handle delete (by removing the data from your array and updating the tableview)
Database.database().reference().removeValue()
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .checkmark
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
tableView.cellForRow(at: indexPath as IndexPath)?.accessoryType = .none
}
您的
viewDidLoad
应该如下所示:
override func viewDidLoad() {
super.viewDidLoad()
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: {didAllow, error in
})
ref = Database.database().reference()
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view, typically from a nib.
databaseHandle = ref.child("Posts").observe(.childAdded) { (snapshot) in
let post = snapshot.value as? String
if let actualPost = post {
self.postData.append(actualPost)
self.tableView.reloadData()
let content = UNMutableNotificationContent()
content.title = "Don't forget"
content.body = "The table view is up to date !"
content.sound = UNNotificationSound.default()
content.categoryIdentifier = "UYLReminderCategory"
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 0.1,
repeats: false)
UNUserNotificationCenter.current().add(.init(identifier: "myNot", content: content, trigger: trigger)) { (error) in
//Your notification completion handler
}
}
}
}
我认为你已经处理了通知授权。
然后,每次Firebase observer触发表视图的新数据时,您都会触发一个通知。尝试这样做
override func viewDidLoad() {
super.viewDidLoad()
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound], completionHandler: {didAllow, error in
})
ref = Database.database().reference()
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view, typically from a nib.
databaseHandle = ref.child("Posts").observe(.childAdded) { (snapshot) in
let post = snapshot.value as? String
if let actualPost = post {
self.postData.append(actualPost)
self.reload(completion: {
//local notification here
})
}
}
}
func reload(completion:() -> Void) {
self.tableView.reloadData()
completion()
}
您的第二行和第三行代码有一个非常小的格式错误。考虑通过将4个前导空间添加到代码行来格式化它们,谢谢。不错的答案…试着多开发一点。。。也。。。不要复制和粘贴。。。想想解决办法。你不是因为初学者而外包devSorry当在帖子中添加子帖子时,应用程序是后台的?当我添加帖子时,应用程序在后台运行并且允许通知放置断点并观察是否调用通知。我猜哪个firebase观测站在后台时不运行。