TableViewCell-自定义单元格iOS-内容

Question

i have a table with a custom cell. This cell have a label that i would like move in cell (if a condition is true). Why the position of label is updated only if the cellForRowAtIndexPath method for that cell is called for the second time?

This is the first question.

The second question is is as follows: The custom cell contain a view, in this view i programmatically add images. If i have two sections in the table, after scrolling the table, the images of first cell in first section appear in the first cell of second section. Why?

This is the code

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

NSString *idDettCal = @"cellaVotoCalciatore";
NSString *idRiepilogo = @"riepilogoCell";
NSString *idTotali = @"bonusTotaliCell";

//Dictionary per Titolari e Panchinari
NSDictionary *calciatore = [[NSDictionary alloc] init];




if (indexPath.section == 0 || indexPath.section == 1) {

    foaVotoCalciatoreCell *cell = (foaVotoCalciatoreCell *)[tableView dequeueReusableCellWithIdentifier:idDettCal];

    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:idDettCal owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }


    //TITOLARI
    if (indexPath.section == 0) {
        calciatore = [titolari objectAtIndex:indexPath.row];

    }
    //PANCHINARI
    else if (indexPath.section == 1) {
        calciatore = [panchinari objectAtIndex:indexPath.row];
    }

    NSString *calciatoreStr =
    [NSString stringWithFormat:@"%@%@%@%@",
     [calciatore objectForKey:@"CALCIATORE"],
     @" (",
     [[calciatore objectForKey:@"SQUADRA"] substringToIndex:3],
     @")"];


    NSString *imgRuolo =
    [NSString stringWithFormat:@"%@%@",
     [calciatore objectForKey:@"RUOLO"],
     @".jpg"];

    cell.ruolo.image = [UIImage imageNamed:imgRuolo];


    NSDictionary *dettaglioVoto = [[NSDictionary alloc] init];
    UIImageView *imageIcona;

    CGFloat offset;
    dettaglioVoto = [calciatore objectForKey:@"VOTO_STM"];



    offset = 0;
    for (NSString *icona in dettaglioVoto) {
        if ([icona isEqualToString: @"AMMONITO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"amm.png"]];
        }
        else if ([icona isEqualToString: @"GOL_FATTO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"golfatto.png"]];
        }
        else if ([icona isEqualToString: @"GOL_SUBITO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"golsubito.png"]];
        }
        else if ([icona isEqualToString: @"ENTRATO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"entrato.png"]];
        }
        else if ([icona isEqualToString: @"USCITO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"uscito.png"]];
        }
        else if ([icona isEqualToString: @"ESPULSO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"esp.png"]];
        }
        else if ([icona isEqualToString: @"ASSIST"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"assist.png"]];
        }
        else if ([icona isEqualToString: @"ASSIST_FERMO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"assistf.png"]];
        }
        else if ([icona isEqualToString: @"RIGORE_SEGNATO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"rigoresegnato.png"]];
        }
        else if ([icona isEqualToString: @"RIGORE_SBAGLIATO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"rigoresbagliato.png"]];
        }
        else if ([icona isEqualToString: @"RIGORE_PARATO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"rigoreparato.png"]];
        }
        else if ([icona isEqualToString: @"AUTOGOL"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"autogol.png"]];
        }
        else if ([icona isEqualToString: @"GOL_PARTITA"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"golvittoria.png"]];
        }
        else if ([icona isEqualToString: @"GOL_PAREGGIO"]) {
            imageIcona = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"golpareggio.png"]];
        }

        imageIcona.frame = CGRectMake(offset, 0, imageIcona.frame.size.width, imageIcona.frame.size.height);
        offset = imageIcona.frame.size.width + offset + 2;
        [cell.iconeDettaglio addSubview: imageIcona];
    }

    if (offset == 0) {
        cell.calciatore.frame = CGRectMake(cell.calciatore.frame.origin.x, 14, cell.calciatore.frame.size.width, cell.calciatore.frame.size.height);
        cell.iconeDettaglio.hidden = YES;
    }

    cell.calciatore.text = calciatoreStr;
    cell.votoIniziale.text = [calciatore objectForKey:@"VOTO_PRNT"];
    cell.votoFinale.text = [calciatore objectForKey:@"VOTO_PRNT_TOT"];
    return cell;

}
//La giornata è calcolata. Sezione 2 = BONUS e TOTALI
else if (variabiliGlobali.gioCalcolata && indexPath.section == 2) {

    NSDictionary *totaliVal;
    NSDictionary *totaliTip;

    totaliVal = [logCalValore objectAtIndex:indexPath.row];
    totaliTip = [logCalTipo objectAtIndex:indexPath.row];

    foaBonusTotaliCell *cell = (foaBonusTotaliCell *)[tableView dequeueReusableCellWithIdentifier:idTotali];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:idTotali owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }

    cell.tipoBonusLabel.text = totaliTip;
    cell.totaleLabel.text = totaliVal;

    return cell;

}

else {
    NSDictionary *riepilogoVal;
    NSDictionary *riepilogoTip;

    riepilogoVal = [logForValore objectAtIndex:indexPath.row];
    riepilogoTip = [logForTipo objectAtIndex:indexPath.row];

    foaRiepilogoCell *cell = (foaRiepilogoCell *)[tableView dequeueReusableCellWithIdentifier:idRiepilogo];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:idRiepilogo owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }

    cell.voceRiepilogoLabel.text = riepilogoTip;
    cell.valoreRiepilogoLabel.text = riepilogoVal;
    return cell;
}



}

Thanks in advance.

Answer 1

First Question: Which label? What condition? Are you talking about this:

if (offset == 0) {
        cell.calciatore.frame = CGRectMake(cell.calciatore.frame.origin.x, 14, cell.calciatore.frame.size.width, cell.calciatore.frame.size.height);
        cell.iconeDettaglio.hidden = YES;
}

You have to be more specific here!

Second Question: The reason that wrong images show up in wrong cells is that your cells are being reused by the tableView . Make sure to set the custom cell's label.text s and imageView.image s to nil right after dequeueReusableCellWithIdentifier: to ensure they are empty when reused.

WARNING: This is NOT a good idea:

[cell.iconeDettaglio addSubview: imageIcona];

Because your cell is being reused, and once reused, you'll see the previous imageIcona and add ANOTHER imageIcona on top as a subview . Make the imageIcona an IBOUTLET or property of your custom cell, and only set its image variable in cellForRowAtIndexPath: .

Answer 2

First question: I can't debug for you, but without running the code, i can imagine that this part of the code

if (offset == 0) {
    cell.calciatore.frame = CGRectMake(cell.calciatore.frame.origin.x, 14, cell.calciatore.frame.size.width, cell.calciatore.frame.size.height);
    cell.iconeDettaglio.hidden = YES;
}

is never reached the first time because of this other part of code offset = imageIcona.frame.size.width + offset + 2; .

And after you scroll, this loop for (NSString *icona in dettaglioVoto) { is not performed because maybe dettaglioVoto is empty, and so the offset will remain equals to zero, and you will have it the way you want. But i can't be sure without you debugging your code to see why the if is not being reached the first time.

Second question: I don't think you are properly using the reuse mechanism for cells. So, if you are going to reuse the cells, you should use set prepareForReuse method in the cell code, like this:

-(void) prepareForReuse {
    // Your code code here: like clearing old images and text and/or setting new images or text
}

Also, it normally works better if you register the nib for the table view, this way:

foaVotoCalciatoreCell *cell = (foaVotoCalciatoreCell *)[tableView dequeueReusableCellWithIdentifier:idDettCal];

if (cell == nil)
{
    [[self tableView] registerNib:[UINib nibWithNibName:loadNibNamed:idDettCal bundle:nil]
       forCellReuseIdentifier:nibWithNibName:loadNibNamed:idDettCal];
}