How to refresh individual UITableViewCells? - ios

Question

I'm having UITableView with few UITableViewCells,
Which plays Different Audio files based on their index path.
I'm showing play/pause button in UITableViewCell.
on play button click in a UITableViewCell,i wanted to reset play button state for last played cell to default(Play).
Storing index of cell in which the play button tapped would do the thing,but we need to reload all the UITableView,Instead of reloading entire UITableView,can't we refresh/reload individual UITableViewCells?
Any help will be appreciated,
Thanks in-advance.

Answer 1

Two step:
1.find get the press row by rewrite your UITableCellView's button's action method
2.update the press row's image

Answer 2

Abstract tip: When using table views have every case implemented in its cellForRow method, that is in its data source. After any change of state or actual data just reload the table with reloadData.
Work for me every time.
More detailed: In your case - have a global index var to show which row is 'playing' now. In cellForRow check if current and global indexes match and show the right button.
Note, that you can also assign tag to any view (buttons also), this can be useful to know which row each button belongs to.

Answer 3

if you have IndexPath of selected cell; then you can get the cell by
UITableViewCell *cell = [UITableviewObj cellForRowAtIndexPath:selIndexPath];
now you have reference to cell; you can change cells content. i would suggest not to change height of the cell through this process.

Answer 4

If I understand correctly, when a user taps a Play button in a different cell, you want to pause the one currently playing and play the new one. The previous cell image should go back from Pause to Play.
In your code where you change Play to Pause and start playing, save an Index path of that cell. Next time Play is clicked check if you have an Index path saved, get the cell and reset the image on it. Something like this:
tableView:didSelectCell {
if (lastPlayingCellPath) {
MyCell *cell = [tableView cellForRowAtIndexPath:lastPlayingCellPath];
[cell setPlayImage];
}
// Play Audio and change current cell image to Pause
lastPlayingCellPath= selectedCellPath;
}
The above is pseudo code, but you should get the idea.
EDIT: From the comments I figured that your custom UITableViewCell subclass handles the tap event. You could fire a notification that you are starting to play. Every cell would subscribe to that event and reset the state of it's button. So you could do something like this in your subclass
- (instancetype)init {
// standard init code
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(willPlay) name:#"CellWillPlayNotification" object:nil];
}
- (void)willPlay {
[self setPlayImage];
}
-(void)buttonTapped {
[[NSNotificationCenter defaultCenter] postNotificationName:#"CellWillPlayNotification" object:self];
// Do your standard handling of the tap
}