How to redraw UITableViewCells automatically given different sorting parameters - ios

Question

I have a UITableViewController called HighScoreViewController that possesses UITableViewCells that are each individual HighScore objects.
When I press the segmented control at the top I want to resort the TableCells immediately. However, currently my sort only works by dragging around so that the cells are off-screen causing the (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath to be called again (which resorts the individual cell according to the score, duration, or date).
I tried to create a method that would be called in my segmented control action that would remove and add the View to redraw the cells. When that didn't work I tried redrawing each cell manually but I realized that it would be a extremely complicated as I would have to monitor which scores had already been sorted in the View and what scores were sorted in the Data Source. I also tried setNeedsDisplay.
How can I resort the UITableViewCells immediately after pressing the segmented control?
This is my action outlet for the segmented Control
- (IBAction)changeSort:(id)sender {
NSLog(#"changing Sort");
// Sorted by score
if (self.sortingButton.selectedSegmentIndex == SORT_BY_SCORE){
[self sortHighScoresByScore];
}else if (self.sortingButton.selectedSegmentIndex == SORT_BY_DURATION){// sorted by duration
[self sortHighScoresByDuration];
}else if (self.sortingButton.selectedSegmentIndex == SORT_BY_DATE){// sorted by last time played
[self sortHighScoresByDate];
}else{
NSLog(#"HighScoreViewController, changeSort else != 0,1,2");
}
}
And this is my cell method:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
//UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"HighScoreCell" forIndexPath:indexPath];
NSLog(#"inside TableView");
UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"HighScoreCell"];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSMutableArray *playingCardHighScores = [defaults objectForKey:#"playingCardHighScores"];
NSMutableArray *setCardHighScores = [defaults objectForKey:#"setCardHighScores"];
// Decode High Scores arrays
playingCardHighScores = [self decodeEncodedArray:playingCardHighScores];
setCardHighScores = [self decodeEncodedArray:setCardHighScores];
/* Will need to set the left and right side to two different scores or add some kind of slider*/
HighScore *hs = playingCardHighScores[indexPath.row];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(55, 4, 260, 20)];
label.font = [UIFont boldSystemFontOfSize:15.0];
label.tag=25;
UILabel *detailLabel = [[UILabel alloc] initWithFrame:CGRectMake(25, 25, 260, 15)];
detailLabel.adjustsFontSizeToFitWidth = YES;
detailLabel.tag=30;
NSString *score = [NSString stringWithFormat:#"Score:%ld",(long)hs.score];
NSString *duration = [NSString stringWithFormat:#",Duration:%.2f",hs.secondsPlayed];
NSString *datePlayed = [NSString stringWithFormat:#",datePlayed:%#",hs.datePlayed];
NSString *combination = [score stringByAppendingString:[duration stringByAppendingString:datePlayed]];
detailLabel.text = combination;
[cell.contentView addSubview:label];
[cell.contentView addSubview:detailLabel];
// Should change depending on what selector is picked
NSString *strScore;
NSDate *date;
switch (self.sortingButton.selectedSegmentIndex) {
case SORT_BY_SCORE:
strScore = [NSString stringWithFormat:#"Score: %ld",(long)hs.score];
break;
case SORT_BY_DURATION:
strScore = [NSString stringWithFormat:#"Duration: %.2f seconds",hs.secondsPlayed];
break;
case SORT_BY_DATE:
date = hs.datePlayed;
break;
default:
break;
}
// if the string exists
if (strScore){
cell.textLabel.text = strScore;
}else{
cell.textLabel.text = [date description];
}
return cell;
}

Answer 1

You'll need to call [self.tableView reloadData] in your segmented control IBAction to get all the cells on screen to be recreated.
Alternatively if you want to be able to specify stock animation, you can call reloadSections:withRowAnimation: on your table view