How to change previously pressed UIButton label in UITableViewCell? - ios

Question

I have UITableView with labels and a button to display list of audios.
Once the button labeled "Play" is pressed it changes to "Stop" and audio is played, and if another button is pressed in other cell the previous cell button SHOULD changes its label to "Play".
Now, the problem I have here is how to change the previous cell button back to "play" ?
The labels are outlets in UITableViewCell and the UIButton is programatically added in cellForRowAtIndexPath
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("SongTitleCell", forIndexPath: indexPath) as SongsTableViewCell
let songDic : NSDictionary = arrSongs.objectAtIndex(indexPath.row) as NSDictionary
cell.lblSongTitle.text = songDic.objectForKey("SongTitle") as? String
btnPlayPause = UIButton(frame : CGRectMake(13,2,40,40))
btnPlayPause.tag = indexPath.row
btnPlayPause.setTitle("Play", forState: UIControlState.Normal)
btnPlayPause.addTarget(self, action: "cellSongClicked:", forControlEvents: UIControlEvents.TouchUpInside)
cell.contentView.addSubview(btnPlayPause)
return cell
}
The Action of the button here:
func cellSongClicked (sender : AnyObject ){
var remote = GetSongData()
remote.delegate = self
var btnCurrentPressed = sender as UIButton
//Play Selected Song
let songDic : NSDictionary = arrSongs.objectAtIndex(btnCurrentPressed.tag) as NSDictionary
if (btnCurrentPressed.currentTitle == "Play") {
remote.PlaySelectedSong(songDic.objectForKey("SongURL") as String!)
btnCurrentPressed.setTitle("Stop", forState: UIControlState.Normal)
} else {
playerContoller.stop()
btnCurrentPressed.setTitle("Play", forState: UIControlState.Normal)
}
}
Thanks

Answer 1

I would use this strategy:
1) mantain the index path of the cell containing the current playing song in a property of your class (you know the new indexPath from the UIButton tag in the "cellSongClicked" action)
2) In "cellForRowAtIndexPath" set the title of the button to "Play" or "Stop" depending on being this the cell of the current playing song
3) When a button is pressed refresh the current playing song cell and the new playing song cell calling on them "reloadRowsAtIndexPaths"
Hope this helps
EDIT CODE DETAILS:
1) don't reallocate every time the button. It must be another outlet of the SongsTableViewCell class (same as the label). And set the target/action from the Interface Builder (add #IBAction in front of "func cellSongClicked" and ctrl-drag from IB)
2) add the following property to your class:
private var currentSong : Int?
3) method cellForRowAtIndexPath:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("SongTitleCell", forIndexPath: indexPath) as SongsTableViewCell
let songDic : NSDictionary = arrSongs.objectAtIndex(indexPath.row) as NSDictionary
cell.lblSongTitle.text = songDic.objectForKey("SongTitle") as? String
cell.btnPlayPause.tag = indexPath.row
var title : String
if let _currentSong = currentSong {
title = indexPath.row == _currentSong ? "Stop" : "Play"
} else {
title = "Play"
}
cell.btnPlayPause.setTitle(title, forState: UIControlState.Normal)
return cell
}
4) And the action:
#IBAction func cellSongClicked (sender : AnyObject ){
var remote = GetSongData()
remote.delegate = self
var btnCurrentPressed = sender as UIButton
//Play Selected Song
let songDic : NSDictionary = arrSongs.objectAtIndex(btnCurrentPressed.tag) as NSDictionary
var rowsToReload = [NSIndexPath]()
var stopCurrent = false
if let _currentSong = currentSong {
if btnCurrentPressed.tag == _currentSong {
stopCurrent = true
} else {
rowsToReload.append(NSIndexPath(forRow: _currentSong, inSection:0))
}
}
rowsToReload.append(NSIndexPath(forRow: btnCurrentPressed.tag, inSection:0))
currentSong = stopCurrent ? nil : btnCurrentPressed.tag
self.tableView.reloadRowsAtIndexPaths(rowsToReload, withRowAnimation: .None)
}
EDIT: Added stop for current song
Check if the user is tapping the current playing button (if btnCurrentPressed.tag == _currentSong). In that case do not reload that row (otherwise you will reload it twice) and set the currentSong property to nil (using temp boolean stopCurrent).