Provide Swift LiveQuery use case example for Realtime Messaging #1197
Description
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Environment Setup
MongoLab(mLab), Google App Engine...
@nlutsenko @wangmengyan95
Since iOS docs aren't released yet i'm still struggling to implement live queries on the client side.
So I'd like to get an example for how it could be use to send/recieve realtime messages in a messaging app using a method I'm using in my own chat app which was previously using push notifications.
How could I implement liveQueries in this method to send/receive realtime messages?
// MARK: - LOAD MESSAGES
func loadMessages() {
print("Loading messages...")
var lastMessage:JSQMessage? = nil
if messages.last != nil {
lastMessage = messages.last
}
let messageQuery = PFQuery(className: "Message")
messageQuery.whereKey("room", equalTo: self.room!)
messageQuery.orderByAscending("createdAt")
messageQuery.limit = 500
messageQuery.includeKey("user")
if lastMessage != nil {
messageQuery.whereKey("createdAt", greaterThan: lastMessage!.date)
}
messageQuery.findObjectsInBackgroundWithBlock { (results: [PFObject]?, error:NSError?) -> Void in
if error == nil {
if results != nil {
let messages = results
for message in messages! {
self.messageObjects.append(message)
let user = message["user"] as! PFUser
self.users.append(user)
let chatMessage = JSQMessage(senderId: user.objectId , displayName: user.objectForKey("name") as! String, text: message["content"] as! String)
self.messages.append(chatMessage)
Answers.logCustomEventWithName("Messages Loaded", customAttributes: nil)
}
}
if results?.count != 0 {
self.finishReceivingMessage()
}
}
}
}Don't think my send method is needed but here it is either way.
//MARK: - SEND MESSAGES
override func didPressSendButton(button: UIButton!, withMessageText text: String!, senderId: String!, senderDisplayName: String!, date: NSDate!) {
let message = PFObject(className: "Message")
message["content"] = text
message["room"] = self.room
message["user"] = PFUser.currentUser()
message.saveInBackgroundWithBlock { (success: Bool, error:NSError?) -> Void in
if error == nil {
self.loadMessages()
//self.sendPushToContact()
self.room!["lastUpdate"] = NSDate()
self.room?.saveInBackgroundWithBlock(nil)
Answers.logCustomEventWithName("Send Message", customAttributes: nil)
} else {
print("Error while sending message \(error?.localizedDescription)")
}
}
self.finishSendingMessage()
}