Created
February 19, 2015 04:15
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Example of fetching messages from Parse
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class ViewController: UITableViewController { | |
var messages:[Message]? | |
var timer:NSTimer? | |
override func viewDidLoad() { | |
super.viewDidLoad() | |
} | |
override func viewDidAppear(animated: Bool) { | |
super.viewDidAppear(animated) | |
self.refreshFired(nil) | |
timer = NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: "refreshFired:", userInfo: nil, repeats: true) | |
} | |
func refreshFired(sender:AnyObject?){ | |
let query = Message.query() | |
query.orderByDescending("createdAt") | |
query.includeKey("user") | |
if let newestMessage = self.messages?.first { | |
query.whereKey("createdAt", greaterThan: newestMessage.createdAt) | |
} | |
query.findObjectsInBackgroundWithBlock { (objects, errorOrNil) -> Void in | |
if let error = errorOrNil { | |
NSLog("Error fetching objects: \(error)") | |
return | |
} | |
if let messagesFromAPI = objects as [Message]!{ | |
NSLog("Messages: \(messagesFromAPI)") | |
dispatch_async(dispatch_get_main_queue(), { () -> Void in | |
let difference = messagesFromAPI.count | |
NSLog("New messages: \(difference)") | |
self.tableView.beginUpdates() | |
var indexPaths:[NSIndexPath] = Array() | |
for var i = 0; i < difference; i++ { | |
indexPaths.append(NSIndexPath(forRow: i, inSection: 0)) | |
} | |
self.messages = messagesFromAPI + (self.messages ?? Array()) | |
self.tableView.insertRowsAtIndexPaths(indexPaths, withRowAnimation: UITableViewRowAnimation.Automatic) | |
self.tableView.endUpdates() | |
self.tableView.reloadData() | |
}) | |
} | |
} | |
} | |
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { | |
let cell = tableView.dequeueReusableCellWithIdentifier("messageCell") as MessageCell | |
let message = self.messages![indexPath.row] | |
cell.messageBodyLabel.text = message.text | |
return cell | |
} | |
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { | |
return messages?.count ?? 0 | |
} | |
} | |
class MessageCell: UITableViewCell { | |
@IBOutlet weak var messageBodyLabel: UILabel! | |
} | |
class Message: PFObject, PFSubclassing { | |
@NSManaged var text:String? | |
@NSManaged var user:PFUser? | |
class func parseClassName() -> String { | |
return "Message" | |
} | |
override class func load() { | |
self.registerSubclass() | |
} | |
} |
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