UITableViewCell avec du contenu dynamique, mise en page dynamique et donc une hauteur de dynamique

Question

J'ai un UITableView qui parfois juste cesse de répondre lorsque son chargé. Je n'ai pas la moindre idée pourquoi cela arrive et je me demandais si ce pourrait être le layouting des cellules que je fais dans cellForRowAtIndexPath, parce que mon contenu est dynamique et donc la mise en page des sous-vues doit être adopté à chaque fois.

Y at-il une meilleure approche pour obtenir ce que je veux? Ou est-il quelque chose de mal d'autre avec cela?

Voici le code que j'ai écrit:

D'abord la méthode qui crée la cellule personnalisée et ajoute les différents points de vue à la vue du contenu:

- (UITableViewCell *)tableViewCellWithReuseIdentifier:(NSString *)identifier {


    UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];


    UILabel *titleLbl, *amountLbl, *title2Lbl, *numberLbl, *mergeLbl, *typeLbl;


    UIColor *bgColor, *blackColor, *amountColor , *title2Color;
    UIColor *clearColor = [UIColor clearColor];


    bgColor = [UIColor clearColor];
    title2Color = [UIColor colorWithRed:0.1 green:0.1 blue:0.6 alpha:1];
    amountColor = [UIColor redColor];
    blackColor = [UIColor blackColor];

    //The number
    numberLbl = [[UILabel alloc] initWithFrame:CGRectZero];
    numberLbl.tag = kNumberLblTag;
    numberLbl.font = [UIFont systemFontOfSize:12];
    numberLbl.textAlignment = UITextAlignmentLeft;
    numberLbl.textColor = blackColor;
    numberLbl.backgroundColor = clearColor;
    numberLbl.numberOfLines = 0;
    [cell.contentView addSubview:numberLbl];
    [numberLbl release];

    amountLbl = [[UILabel alloc] initWithFrame:CGRectZero];
    amountLbl.tag = kamountLblTag;
    amountLbl.font = [UIFont systemFontOfSize:12];
    amountLbl.textAlignment = UITextAlignmentLeft;
    amountLbl.textColor = amountColor;
    amountLbl.backgroundColor = clearColor;
    amountLbl.numberOfLines = 0;
    [cell.contentView addSubview:amountLbl];
    [amountLbl release];


    mergeLbl = [[UILabel alloc] initWithFrame:CGRectZero] ;
    mergeLbl.tag = kMergeLblTag;
    mergeLbl.font = [UIFont systemFontOfSize:12];
    mergeLbl.textAlignment = UITextAlignmentLeft;
    mergeLbl.textColor = blackColor;
    mergeLbl.backgroundColor = clearColor;
    mergeLbl.numberOfLines = 0;
    [cell.contentView addSubview:mergeLbl];
    [mergeLbl release];


    typeLbl = [[UILabel alloc] initWithFrame:CGRectZero];
    typeLbl.tag = kTypeLblTag;
    typeLbl.font = [UIFont systemFontOfSize:12];
    typeLbl.textAlignment = UITextAlignmentLeft;
    typeLbl.textColor = blackColor;
    typeLbl.backgroundColor = clearColor;
    typeLbl.numberOfLines = 1;
    [cell.contentView addSubview:typeLbl];
    [typeLbl release];


    titleLbl = [[UILabel alloc] initWithFrame:CGRectZero];
    titleLbl.tag = kTitleLblTag;
    titleLbl.font = [UIFont systemFontOfSize:14];
    titleLbl.textAlignment = UITextAlignmentLeft;
    titleLbl.textColor = blackColor;
    titleLbl.backgroundColor = clearColor;
    titleLbl.numberOfLines = 0;
    [cell.contentView addSubview:titleLbl];
    [titleLbl release];


    title2Lbl = [[UILabel alloc] initWithFrame:CGRectZero];
    title2Lbl.tag = ktitle2LblTag;
    title2Lbl.font = [UIFont systemFontOfSize:12];
    title2Lbl.textAlignment = UITextAlignmentLeft;
    title2Lbl.textColor = title2Color;
    title2Lbl.backgroundColor = clearColor;    
    title2Lbl.numberOfLines = 0;
    [cell.contentView addSubview:title2Lbl];
    [title2Lbl release];


    UIView *bgView = [[UIView alloc]initWithFrame:CGRectZero];
    bgView.backgroundColor = bgColor;
    cell.backgroundView = bgView;
    [bgView release];


    NSLog(@"tableViewCellWithReuseIdentifier");

    return cell;

}

Et voici la méthode qui redimensionne les sous-vues pour chaque cellule:

    // Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {



    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: CellIdentifier];



    NSUInteger row = [indexPath row];
    NSUInteger section = [indexPath section];

    NSUInteger r = row+(section*100);

    if (cell == nil) {

        cell = [self tableViewCellWithReuseIdentifier: CellIdentifier];

    }

    UIColor *bgColor, *clearColor = [UIColor clearColor];





    //set the rePointer to the actual array 
    if (r < [results count]) {
        rePointer = results;
        //NSLog(@"results r: %i", r);
    }else {
        r = [indexPath row];
        rePointer = rejects;
        //NSLog(@"rejects r: %i", r);

    }



    NSString *noTxt = [[NSString alloc]initWithFormat:@"%i.", r+1];
    CGSize boundingSize = CGSizeMake(35, 100);
    UIFont *sysFont = [UIFont systemFontOfSize:12]; 
    CGSize requiredSize = [noTxt sizeWithFont:sysFont constrainedToSize:boundingSize lineBreakMode:UILineBreakModeWordWrap];
    CGFloat requiredHeight = requiredSize.height;

    UILabel *numberLbl = (UILabel*)[cell viewWithTag:kNumberLblTag];
    numberLbl.frame = CGRectMake(5, 5, 35, requiredHeight);
    numberLbl.text = noTxt;





    NSMutableString *amountTxt = [[NSMutableString alloc]initWithString:@"amount: "];
    [amountTxt appendString:[NSString stringWithFormat:@"%@", [[rePointer objectAtIndex:r] objectForKey:@"amount"]]];


    boundingSize = CGSizeMake(35, 100);
    sysFont = [UIFont systemFontOfSize:12]; 
    requiredSize = [amountTxt sizeWithFont:sysFont constrainedToSize:boundingSize lineBreakMode:UILineBreakModeWordWrap];
    requiredHeight = requiredSize.height;

    UILabel *amountLbl = (UILabel*)[cell viewWithTag:kamountLblTag];
    amountLbl.frame = CGRectMake(5, 20, 35, requiredHeight);
    amountLbl.text = amountTxt;





    if ([[[rePointer objectAtIndex:r] objectForKey:@"count"] intValue] > 0) {

        NSString *mergedTxt = [[NSString alloc]initWithString:@"Count"];
        boundingSize = CGSizeMake(35, 100);
        sysFont = [UIFont systemFontOfSize:12]; 
        requiredSize = [mergedTxt sizeWithFont:sysFont constrainedToSize:boundingSize lineBreakMode:UILineBreakModeWordWrap];
        requiredHeight = requiredSize.height;


        UILabel *mergeLbl = (UILabel*)[cell viewWithTag:kMergeLblTag];
        mergeLbl.frame = CGRectMake(5, 50, 35, requiredHeight);
        mergeLbl.text = mergedTxt;
        [mergedTxt release];

    }else {

        UILabel *mergeLbl = (UILabel*)[cell viewWithTag:kMergeLblTag];
        mergeLbl.frame = CGRectZero;
        mergeLbl.text = @"";

    }



    NSString *type;

    if (![[[rePointer objectAtIndex:r] objectForKey:@"type"] isEqualToString:@"NotSet"]) {
        if ([[[rePointer objectAtIndex:r] objectForKey:@"type"] isEqualToString:@"[XYZ]"]) {
            type = @"X";
        }else{
            int typeLength = [[[rePointer objectAtIndex:r] objectForKey:@"type"] length];
            type = [[[rePointer objectAtIndex:r] objectForKey:@"type"] substringWithRange:NSMakeRange(1, typeLength-2)];
        }


        UILabel *typeLbl = (UILabel*)[cell viewWithTag:kTypeLblTag];
        typeLbl.frame = CGRectMake(5, 65, 35, 20);
        typeLbl.text = type;

    }else {
        UILabel *typeLbl = (UILabel*)[cell viewWithTag:kTypeLblTag];
        typeLbl.frame = CGRectZero;
        typeLbl.text = @"";
    }






    NSString *titleTxt = [[NSString alloc]initWithString:[[[rePointer objectAtIndex:r] objectForKey:@"h_title"]stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]]];


    boundingSize = CGSizeMake(190, 1000);
    sysFont = [UIFont systemFontOfSize:14];

    requiredSize = [titleTxt sizeWithFont:sysFont constrainedToSize:boundingSize lineBreakMode:UILineBreakModeWordWrap];
    requiredHeight = requiredSize.height;

    CGFloat titleHeight = requiredHeight;

    UILabel *titleLbl = (UILabel*)[cell viewWithTag:kTitleLblTag];
    titleLbl.frame = CGRectMake(50, 5, 190, requiredHeight);
    titleLbl.text = titleTxt;
    [titleTxt release];





    NSString *title2Txt = [[NSString alloc]initWithString:[[[rePointer objectAtIndex:r] objectForKey:@"title2"]stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]]];

    sysFont = [UIFont systemFontOfSize:12];
    requiredSize = [title2Txt sizeWithFont:sysFont constrainedToSize:boundingSize lineBreakMode:UILineBreakModeWordWrap];
    requiredHeight = requiredSize.height;

    UILabel *title2Lbl = (UILabel*)[cell viewWithTag:ktitle2LblTag];
    title2Lbl.frame = CGRectMake(50, titleHeight + 10, 190, requiredHeight);
    title2Lbl.text = title2Txt;
    [title2Txt release];




    /*
    CGFloat height = [[[rePointer objectAtIndex:r] objectForKey:@"h_title"] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
    height += [[[rePointer objectAtIndex:r] objectForKey:@"title2"] sizeWithFont:[UIFont systemFontOfSize:12] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
    height += 20;
    */

    cell.contentView.backgroundColor = clearColor;
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    NSLog(@"cellForRowAtIndexPath");




    /*
    cell.backgroundView.frame = CGRectMake(0, 0, 320, height-1);
    cell.backgroundView.backgroundColor = bgColor;
    */



    return cell;

}

Et enfin le heightForRowAtIndexPath:

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {    


    NSUInteger row = [indexPath row];
    NSUInteger section = [indexPath section];
    row += section*100;

    NSUInteger rejectsIndex = [indexPath row];

    if (row < [results count]) {
        CGFloat height = [[[results objectAtIndex:row] objectForKey:@"h_title"] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
        height += [[[results objectAtIndex:row] objectForKey:@"title2"] sizeWithFont:[UIFont systemFontOfSize:12] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
        height += 20;
        return MAX(90, height);
    }else {
        CGFloat height = [[[rejects objectAtIndex:rejectsIndex] objectForKey:@"h_title"] sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
        height += [[[rejects objectAtIndex:rejectsIndex] objectForKey:@"title2"] sizeWithFont:[UIFont systemFontOfSize:12] constrainedToSize:CGSizeMake(190, 1000) lineBreakMode:UILineBreakModeWordWrap].height;
        height += 20;

        return MAX (90, height);
    }


}

Merci beaucoup pour tout conseil!

Answer 1

est avéré que c'était un bug iOS.

Answer 2

Je pense que votre code est trop compliqué et donc inefficace. Peut-être vous devriez envisager d'utiliser une cellule de vue de tableau personnalisé qui vous permet d'accéder à tous les éléments propres et directement.

Je suggère également de mettre en cache les mesures de taille potentiellement lente.

Answer 3

Parce que vous utilisez balise pour identifier la sous-vue dans la cellule. Soyez soin d'une chose, NE PAS utiliser 0 pour le numéro de l'étiquette, ou un numéro d'étiquette comme le même que la valeur de la variable de la cellule.

La méthode viewWithTag. Retourne la première sous-vue avec le numéro d'étiquette, si l'étiquette de la cellule est le même que celui que vous le souhaitez, il retournera la cellule, et non une sous-vue

La suggestion de Eiko est juste, vous devriez envisager d'utiliser une cellule de vue de tableau personnalisé.