My TableView crashes when I make the run App - ios

Question

I state that in my app I'm using Parse.com for storing and managing data.
In my tableview I have introduced two different custom cells. A is displayed if there is an image and the other hand is displayed if the image is not present.
Now everything seems to work but when I go to make the application run the Tableview crash reporting this error:
2013-11-22 15:36:34.256 UniGo![17186:70b]
Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:],/SourceCache/UIKit_Sim/UIKit-2903.23/UITableView.m:6246**
Can you explain where I'm wrong?
- (void)viewDidLoad {
[super viewDidLoad];
self.FFTableView.delegate = self;
self.FFTableView.dataSource = self;
CellaSelezionata = -1;
}
-(void)viewDidAppear:(BOOL)animated {
[self QueryForPost];
}
-(void)QueryForPost {
PFQuery *QueryForFriend=[PFQuery queryWithClassName:FF_AMICIZIE_CLASS];
[QueryForFriend whereKey:FF_AMICIZIE_A_USER equalTo:[PFUser currentUser]];
[QueryForFriend whereKey:FF_AMICIZIE_STATO equalTo:#"Confermato"];
[QueryForFriend includeKey:FF_AMICIZIE_DA_USER];
PFQuery *QueryYES = [PFQuery queryWithClassName:FF_POST_CLASS];
[QueryYES whereKey:FF_POST_FLASH_POST_BOOLEANVALUE equalTo:[NSNumber numberWithBool:YES]];
[QueryYES whereKey:FF_POST_SCELTI equalTo:[PFUser currentUser]];
PFQuery *normalPostByFriends = [PFQuery queryWithClassName: FF_POST_CLASS];
[normalPostByFriends whereKey: FF_POST_FLASH_POST_BOOLEANVALUE equalTo: [NSNumber numberWithBool: NO]];
[normalPostByFriends whereKey: FF_POST_UTENTE matchesKey:FF_AMICIZIE_DA_USER inQuery:QueryForFriend];
PFQuery *normalPostByUser = [PFQuery queryWithClassName:FF_POST_CLASS];
[normalPostByUser whereKey:FF_POST_FLASH_POST_BOOLEANVALUE equalTo: [NSNumber numberWithBool: NO]];
[normalPostByUser whereKey:FF_POST_UTENTE equalTo: [PFUser currentUser]];
PFQuery *query = [PFQuery orQueryWithSubqueries:#[QueryYES,normalPostByFriends,normalPostByUser]];
[query includeKey:FF_POST_UTENTE];
[query orderByDescending:FF_CREATEDAT];
[query findObjectsInBackgroundWithBlock:^(NSArray *results, NSError *error) {
if (!error) {
ArrayforPost = [[NSMutableArray alloc] init];
for (PFObject *object in results) {
[ArrayforPost addObject:object];
}
[self.FFTableView reloadData];
}
}];
}
-(CGFloat)valoreAltezzaCella:(NSInteger)index {
PFObject *objectPost = [ArrayforPost objectAtIndex:index];
NSString *text = [objectPost objectForKey:#"Testo"];
CGSize MAX = CGSizeMake(230, 10000);
UIFont *FONT = [UIFont systemFontOfSize:14];
CGSize altezzaLabel = [text boundingRectWithSize:MAX options:NSStringDrawingUsesLineFragmentOrigin attributes:#{NSFontAttributeName:FONT }context:nil].size;
return altezzaLabel.height;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [ArrayforPost count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
PFObject *ObjectPost = [ArrayforPost objectAtIndex:indexPath.row];
// FIRST CUSTOM CELL
if (![ObjectPost objectForKey:FF_POST_IMMAGINE]) {
static NSString *IdentificazioneCella = #"CellPost";
FFCustomCellTimelineSocial * Cella = (FFCustomCellTimelineSocial *)[self.FFTableView dequeueReusableCellWithIdentifier:IdentificazioneCella];
if (Cella == nil) {
Cella = [[FFCustomCellTimelineSocial alloc]
initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:IdentificazioneCella ];
}
Cella.backgroundCell.layer.cornerRadius = 2.0f;
Cella.backgroundCell.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
Cella.backgroundCell.layer.borderWidth = 1.0f;
Cella.backgroundCell.autoresizingMask = UIViewAutoresizingFlexibleHeight;
Cella.BackgroundText.layer.cornerRadius = 2.0f;
Cella.BackgroundText.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
Cella.BackgroundText.layer.borderWidth = 0.0f;
Cella.BackgroundText.autoresizingMask = UIViewAutoresizingFlexibleHeight;
Cella.TimeBackground.layer.cornerRadius = 2.0f;
Cella.TimeBackground.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
Cella.TimeBackground.layer.borderWidth = 1.0f;
Cella.ViewTestataCell.layer.cornerRadius = 2.0f;
Cella.ViewTestataCell.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
Cella.ViewTestataCell.layer.borderWidth = 1.0f;
Cella.FFImmagineUtente.layer.masksToBounds = YES;
Cella.FFImmagineUtente.layer.cornerRadius = 20.0f;
Cella.FFImmagineUtente.contentMode = UIViewContentModeScaleAspectFill;
Cella.FFTestoUtenteLabel.font = [UIFont fontWithName:#"Helvetica" size:14.0f];
NSString *text = [ObjectPost objectForKey:FF_POST_TEXT];
Cella.FFTestoUtenteLabel.text = text;
[Cella.FFTestoUtenteLabel setLineBreakMode:NSLineBreakByTruncatingTail];
NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"dd MMM"];
NSString *dateString = [dateFormatter stringFromDate:currDate];
Cella.DataCorrente.text = dateString;
NSString *NomeUser = [[ObjectPost objectForKey:FF_POST_UTENTE] objectForKey:FF_USER_NOMECOGNOME];
Cella.FFNomeUtenteLabel.text = NomeUser;
NSString *ImmagineUtente = [[ObjectPost objectForKey:FF_POST_UTENTE] objectForKey:FF_USER_FOTOPROFILO];
Cella.FFImmagineUtente.file = (PFFile *)ImmagineUtente;
[Cella.FFImmagineUtente loadInBackground];
if (CellaSelezionata == indexPath.row) {
CGFloat AltezzaLabel = [self valoreAltezzaCella: indexPath.row];
Cella.FFTestoUtenteLabel.frame = CGRectMake(Cella.FFTestoUtenteLabel.frame.origin.x, Cella.FFTestoUtenteLabel.frame.origin.y, Cella.FFTestoUtenteLabel.frame.size.width, AltezzaLabel); }
else {
Cella.FFTestoUtenteLabel.frame = CGRectMake(Cella.FFTestoUtenteLabel.frame.origin.x, Cella.FFTestoUtenteLabel.frame.origin.y, Cella.FFTestoUtenteLabel.frame.size.width, 55);
}
PFObject *rowObject = [ArrayforPost objectAtIndex:indexPath.row];
if([[rowObject objectForKey:FF_POST_FLASH_POST_BOOLEANVALUE ] boolValue]) {
Cella.FlashPostImg.image = [UIImage imageNamed:#"FFNotificaFlash"];
}
else {
Cella.FlashPostImg.image = [UIImage imageNamed:#" "]; }
return Cella;
}
else {
// SECOND CUSTOM CELL
static NSString *IdentificazioneCellaIMG = #"CellIMG";
FFCustomCellWithImage * CellaIMG = (FFCustomCellWithImage * )[self.FFTableView dequeueReusableCellWithIdentifier:IdentificazioneCellaIMG];
CellaIMG = (FFCustomCellWithImage * )[self.FFTableView dequeueReusableCellWithIdentifier:IdentificazioneCellaIMG];
if (CellaIMG == nil) {
CellaIMG = [[FFCustomCellWithImage alloc]
initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:IdentificazioneCellaIMG ];
}
NSString *FotoPostSocial = [ObjectPost objectForKey:FF_POST_IMMAGINE];
CellaIMG.FotoPost.file = (PFFile *)FotoPostSocial;
[CellaIMG.FotoPost loadInBackground];
CellaIMG.backgroundCell.layer.cornerRadius = 2.0f;
CellaIMG.backgroundCell.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
CellaIMG.backgroundCell.layer.borderWidth = 1.0f;
CellaIMG.backgroundCell.autoresizingMask = UIViewAutoresizingFlexibleHeight;
CellaIMG.TimeBackground.layer.cornerRadius = 2.0f;
CellaIMG.TimeBackground.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
CellaIMG.TimeBackground.layer.borderWidth = 1.0f;
CellaIMG.ViewTestataCell.layer.cornerRadius = 2.0f;
CellaIMG.ViewTestataCell.layer.borderColor = [UIColor colorWithRed:(219/255.0) green:(219/255.0) blue:(219/255.0) alpha:(1)].CGColor;
CellaIMG.ViewTestataCell.layer.borderWidth = 1.0f;
CellaIMG.FotoProfilo.layer.masksToBounds = YES;
CellaIMG.FotoProfilo.layer.cornerRadius = 20.0f;
CellaIMG.FotoProfilo.contentMode = UIViewContentModeScaleAspectFill;
CellaIMG.TestoPost.font = [UIFont fontWithName:#"Helvetica" size:14.0f];
NSString *text = [ObjectPost objectForKey:FF_POST_TEXT];
CellaIMG.TestoPost.text = text;
[CellaIMG.TestoPost setLineBreakMode:NSLineBreakByTruncatingTail];
NSDate *currDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"dd MMM"];
NSString *dateString = [dateFormatter stringFromDate:currDate];
CellaIMG.DataPost.text = dateString;
NSString *NomeUser = [[ObjectPost objectForKey:FF_POST_UTENTE] objectForKey:FF_USER_NOMECOGNOME];
CellaIMG.NomeUtente.text = NomeUser;
NSString *ImmagineUtente = [[ObjectPost objectForKey:FF_POST_UTENTE] objectForKey:FF_USER_FOTOPROFILO];
CellaIMG.FotoProfilo.file = (PFFile *)ImmagineUtente;
[CellaIMG.FotoProfilo loadInBackground];
if (CellaSelezionata == indexPath.row) {
CGFloat AltezzaLabel = [self valoreAltezzaCella: indexPath.row];
CellaIMG.TestoPost.frame = CGRectMake(CellaIMG.TestoPost.frame.origin.x, CellaIMG.TestoPost.frame.origin.y, CellaIMG.TestoPost.frame.size.width, AltezzaLabel);
}
else {
CellaIMG.TestoPost.frame = CGRectMake(CellaIMG.TestoPost.frame.origin.x, CellaIMG.TestoPost.frame.origin.y, CellaIMG.TestoPost.frame.size.width, 75);
}
return CellaIMG;
}
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath; {
if (CellaSelezionata == indexPath.row) {
//SPAZIO INTERNO VERSO IL BASSO QUANDO APRI LA CELLA
return [self valoreAltezzaCella:indexPath.row] + 60 * 2;
}
else {
//GRANDEZZA CELLA PRIMA DI APRIRE
return 155 + 10 * 2;
}
}
-(NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if ([self valoreAltezzaCella:indexPath.row] > 65) {
return indexPath;
} else {
return nil;
}
}
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (CellaSelezionata == indexPath.row) {
CellaSelezionata = -1;
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
return;
}
if (CellaSelezionata >= 0) {
NSIndexPath *previousPath = [NSIndexPath indexPathForRow:CellaSelezionata inSection:0];
CellaSelezionata = indexPath.row;
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:previousPath] withRowAnimation:UITableViewRowAnimationFade];
}
CellaSelezionata = indexPath.row;
[tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}

Answer 1

dequeueReusableCellWithIdentifier - can return you nil
You need to check that and create a cell if that happens:
FFCustomCellTimelineSocial * Cella = (FFCustomCellTimelineSocial *)[self.FFTableView dequeueReusableCellWithIdentifier:IdentificazioneCella];
if (Cella == nil) {
Cella = [[[FFCustomCellTimelineSocial alloc]
initWithStyle:UITableViewCellStyleSubtitle
reuseIdentifier:CellIdentifier] autorelease];
}