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我有一個使用JSQMessagesViewController框架構建的簡單消息應用程序。我一直在嘗試使用CoreLocation來收集用戶的位置，我想在實際的消息內容（attributedTextForCellBottomLabelAtIndexPath）下顯示該位置。我已經想通了所有這些，但問題是每個位置對於每條單獨的消息都必須是唯一的，並且這不起作用。顯示用戶位置
例如，如果用戶從西雅圖發送消息，它應該在他們的消息下面說「西雅圖」。如果另一個用戶向San Fransisco發送另一條消息，則應在他們的消息中說「San Fransisco」。
現在發生的事情是，所有的消息都說他們來自用戶當前所在的位置（假設他們在西雅圖）。所以如果另一個人在聖弗朗西斯科並不重要，那麼這個消息會顯示它來自西雅圖。
這是一個非常混亂的問題，但一個惱人的一個，我認爲應該有一個簡單的解決...
這裏是attributedTextForCellBottomLabelAtIndexPath代碼：
override func collectionView(collectionView: JSQMessagesCollectionView!, attributedTextForCellBottomLabelAtIndexPath indexPath: NSIndexPath!) -> NSAttributedString! {
let message = messages[indexPath.item]
// Call data I have retrieved below with message
let text = getLocation()
if message.senderId == senderId {
return nil
} else {
return NSAttributedString(string: text)
}
}
注：我有一個函數getLocation()，簡單地返回用戶的城市/州/國
這裏是代碼爲其餘的th上下文E級ChatViewController：
/*
* Copyright (c) 2016 Ahad Sheriff
*/
import UIKit
import Firebase
import JSQMessagesViewController
import CoreLocation
class ChatViewController: JSQMessagesViewController, CLLocationManagerDelegate {
// MARK: Properties
//Firebase
var rootRef = FIRDatabase.database().reference()
var messageRef: FIRDatabaseReference!
var locationRef: FIRDatabaseReference!
//JSQMessages
var messages = [JSQMessage]()
var outgoingBubbleImageView: JSQMessagesBubbleImage!
var incomingBubbleImageView: JSQMessagesBubbleImage!
//Location
var city: String = ""
var state: String = ""
var country: String = ""
var locationManager = CLLocationManager()
var locationId: String = ""
func getLocation() -> String {
if city == ("") && state == ("") && country == (""){
return "Planet Earth"
}
else {
if country == ("United States") {
return self.city + ", " + self.state
}
else {
return self.city + ", " + self.state + ", " + self.country
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Initialize location
locationManager.delegate = self
locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
//collect user's location
locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
locationManager.requestLocation()
locationManager.startUpdatingLocation()
}
title = "Chat"
setupBubbles()
// No avatars
// Remove file upload icon
self.inputToolbar.contentView.leftBarButtonItem = nil;
// Send button
self.inputToolbar.contentView.rightBarButtonItem.setTitle("Send", forState: UIControlState.Normal)
collectionView!.collectionViewLayout.incomingAvatarViewSize = CGSizeZero
collectionView!.collectionViewLayout.outgoingAvatarViewSize = CGSizeZero
//Firebase reference
messageRef = rootRef.child("messages")
locationRef = rootRef.child("locations")
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
observeMessages()
}
override func viewDidDisappear(animated: Bool) {
super.viewDidDisappear(animated)
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
//--- CLGeocode to get address of current location ---//
CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: {(placemarks, error)->Void in
if let pm = placemarks?.first
{
self.displayLocationInfo(pm)
}
})
}
func displayLocationInfo(placemark: CLPlacemark?)
{
if let containsPlacemark = placemark
{
//stop updating location
locationManager.stopUpdatingLocation()
self.city = (containsPlacemark.locality != nil) ? containsPlacemark.locality! : ""
self.state = (containsPlacemark.administrativeArea != nil) ? containsPlacemark.administrativeArea! : ""
self.country = (containsPlacemark.country != nil) ? containsPlacemark.country! : ""
print(getLocation())
}
}
func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
print("Error while updating location " + error.localizedDescription)
}
override func collectionView(collectionView: JSQMessagesCollectionView!,
messageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageData! {
return messages[indexPath.item]
}
override func collectionView(collectionView: JSQMessagesCollectionView!,
messageBubbleImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageBubbleImageDataSource! {
let message = messages[indexPath.item] // 1
if message.senderId == senderId { // 2
return outgoingBubbleImageView
} else { // 3
return incomingBubbleImageView
}
}
override func collectionView(collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return messages.count
}
override func collectionView(collectionView: JSQMessagesCollectionView!,
avatarImageDataForItemAtIndexPath indexPath: NSIndexPath!) -> JSQMessageAvatarImageDataSource! {
return nil
}
private func setupBubbles() {
let factory = JSQMessagesBubbleImageFactory()
outgoingBubbleImageView = factory.outgoingMessagesBubbleImageWithColor(
purp)
incomingBubbleImageView = factory.incomingMessagesBubbleImageWithColor(
redish)
}
func addMessage(id: String, text: String) {
let message = JSQMessage(senderId: id, displayName: "", text: text)
messages.append(message)
}
override func collectionView(collectionView: UICollectionView,
cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = super.collectionView(collectionView, cellForItemAtIndexPath: indexPath)
as! JSQMessagesCollectionViewCell
let message = messages[indexPath.item]
if message.senderId == senderId {
cell.textView!.textColor = UIColor.whiteColor()
} else {
cell.textView!.textColor = UIColor.whiteColor()
}
return cell
}
override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!,
senderDisplayName: String!, date: NSDate!) {
let itemRef = messageRef.childByAutoId() // 1
let messageItem = [ // 2
"text": text,
"senderId": senderId
]
itemRef.setValue(messageItem) // 3
let locRef = locationRef.childByAutoId()
let locItem = [
senderId : [
"location": getLocation()
]
]
locRef.setValue(locItem)
// 4
JSQSystemSoundPlayer.jsq_playMessageSentSound()
// 5
finishSendingMessage()
Answers.logCustomEventWithName("Message sent", customAttributes: nil)
}
private func observeMessages() {
// 1
let messagesQuery = messageRef.queryLimitedToLast(25)
// 2
messagesQuery.observeEventType(.ChildAdded) { (snapshot: FIRDataSnapshot!) in
// 3
let id = snapshot.value!["senderId"] as! String
let text = snapshot.value!["text"] as! String
// 4
self.addMessage(id, text: text)
// 5
self.finishReceivingMessage()
Answers.logCustomEventWithName("Visited RoastChat", customAttributes: nil)
}
}
override func collectionView(collectionView: JSQMessagesCollectionView!, attributedTextForCellBottomLabelAtIndexPath indexPath: NSIndexPath!) -> NSAttributedString! {
let message = messages[indexPath.item]
// Call data I have retrieved below with message
let text = getLocation()
if message.senderId == senderId {
return nil
} else {
return NSAttributedString(string: text)
}
}
override func collectionView(collectionView: JSQMessagesCollectionView, layout collectionViewLayout: JSQMessagesCollectionViewFlowLayout, heightForCellBottomLabelAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return kJSQMessagesCollectionViewCellLabelHeightDefault
}
}
注意：您也可以忽略我在哪裏保存用戶位置火力地堡的代碼。
感謝您提前提供任何幫助！如果您還有其他問題，請告訴我。
感謝您的回答！你有沒有關於如何保存數據/檢索數據的想法，因爲你對這樣做的語法有什麼瞭解嗎？ –
這將是該文件的firebase文檔。 –
我來看看 –