I got to show the createdAt date in a message timeline, I tried to make a separate array only for dates, but don't know if it is the right path to follow. It seems to me that my workaround is too tricky.
I'd like to be sure that what I've done is not necessarily the right way, but at least it isn't a wrong way (Edison's style). How can I optimize this date-related code?
I highlighted code I'm talking about with ****** problem x/3 *******
class MessagesTimelineTVC: UITableViewController {
// var myRefreshControl : UIRefreshControl!
var timelineData : [String] = []
var messageDateArray : [NSDate] = []
func loadData() {
timelineData.removeAll(keepCapacity: true) //erase previus contents
var findTimeLineDataQuery = PFQuery(className: "Messages")
findTimeLineDataQuery.findObjectsInBackgroundWithBlock({
(objects : [AnyObject]?, error : NSError?) -> Void in
if error == nil {
for singleObject in objects! {
if let stringData = singleObject["message"] as? String {
self.timelineData.append(stringData)
//MARK: *********** problem 1/3 *********
if let messageDate = singleObject.createdAt {
self.messageDateArray.append(messageDate!)
println(messageDate!)
}
//MARK: *********** problem 1/3 *********
}
}
let reversedArray : Array = self.timelineData.reverse() //MARK: Always Remember!
self.timelineData = reversedArray as Array
//MARK: *********** problem 2/3 *********
let reversedMessageDateArray : Array = self.messageDateArray.reverse() //MARK: Always Remember!
self.messageDateArray = reversedMessageDateArray as Array
//MARK: *********** problem 2/3 *********
self.tableView.reloadData()
}
})
}
// MARK: Parse
override func viewDidAppear(animated: Bool) {
self.loadData()
if PFUser.currentUser() == nil {
var loginAlertController = UIAlertController(title: "Sign up / login", message: "please sign up or login", preferredStyle: UIAlertControllerStyle.Alert)
loginAlertController.addTextFieldWithConfigurationHandler({
textfField in
textfField.placeholder = "Your username"
})
loginAlertController.addTextFieldWithConfigurationHandler({
textfField in
textfField.placeholder = "Your password"
textfField.secureTextEntry = true
})
// MARK: login action in the array
loginAlertController.addAction(UIAlertAction(title: "Login Action", style: UIAlertActionStyle.Default, handler: {
alertAction in
let textFields : NSArray = loginAlertController.textFields!
let usernameTextField : UITextField = textFields[0] as! UITextField
let passwordTextField : UITextField = textFields[1] as! UITextField
//MARK: Parse login problem - 15:39
PFUser.logInWithUsernameInBackground(usernameTextField.text, password: passwordTextField.text){
(user: PFUser?, error: NSError?) -> Void in
if user != nil {
println("login success!")
} else {
println("login failed!")
}
}
}))
// MARK: sign up action in the array
loginAlertController.addAction(UIAlertAction(title: "Sign up", style: UIAlertActionStyle.Default, handler: {
alertAction in
let textFields : NSArray = loginAlertController.textFields!
let usernameTextField : UITextField = textFields[0] as! UITextField
let passwordTextField : UITextField = textFields[1] as! UITextField
var messageSender = PFUser() //16:42
messageSender.username = usernameTextField.text
messageSender.password = passwordTextField.text
messageSender.signUpInBackgroundWithBlock({
(success: Bool, error: NSError?) -> Void in
if error == nil {
println("sign up successful")
} else {
// let errorString = error!.userInfo["error"] as! String
let errorString = error!.localizedDescription
println(errorString)
}
})
}))
self.presentViewController(loginAlertController, animated: true, completion: nil)
}
}
override func viewWillAppear(animated: Bool) {
// self.loadData()
// self.myRefreshControl = UIRefreshControl()
// self.myRefreshControl.attributedTitle = NSAttributedString(string: "Pull to refresh")
// self.myRefreshControl.addTarget(self, action: "refresh:", forControlEvents: UIControlEvents.ValueChanged)
// self.tableView.addSubview(myRefreshControl)
}
func refresh(sender:AnyObject)
{
// var loaded = false
// self.loadData()
//
// loaded = true
// if loaded {
// tableView.reloadData()
// self.myRefreshControl.endRefreshing()
// }
}
override func viewDidLoad() {
super.viewDidLoad()
// self.loadData() //if I call this here, messages will be doubled
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return timelineData.count
}
//MARK: WARNING! Cast from 'String' to unrelated type 'PFObject' always fails
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell : MyCellTableViewCell = tableView.dequeueReusableCellWithIdentifier("myCellID", forIndexPath: indexPath) as! MyCellTableViewCell
cell.messageCellLabel?.text = self.timelineData[indexPath.row]
cell.nameCellLabel.text = "Sender Name and Row: \(indexPath.row)"
//MARK: *********** problem 3/3 *********
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy HH:mm"
var useDate = dateFormatter.stringFromDate(self.messageDateArray[indexPath.row])
cell.dateMessageLabel.text = useDate
//MARK: *********** problem 3/3 *********
if indexPath.row % 2 == 0 {
cell.backgroundColor = UIColor(red: 143 / 255, green: 204 / 255, blue: 255 / 255, alpha: 1)
cell.messageCellLabel.backgroundColor = UIColor(red: 63 / 255, green: 159 / 255, blue: 255 / 255, alpha: 1)
} else {
cell.backgroundColor = UIColor(red: 63 / 255, green: 159 / 255, blue: 255 / 255, alpha: 1)
cell.messageCellLabel.backgroundColor = UIColor(red: 143 / 255, green: 204 / 255, blue: 255 / 255, alpha: 1)
}
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
println(indexPath.row)
}
}
