UITableViewCell mit alternativer Hintergrundfarbe in individuellen Zellen

Ist es sehr einfach, die indexPath sagt Ihnen alles, was Sie brauchen, um wissen. Wenn die indexPath.Zeile selbst ist, dann verwenden Sie eine Farbe. Wenn die indexPath.Zeile ungerade ist, verwenden Sie eine andere Farbe.

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

    //SETTING BACKGROUND COLOR

    //       UIView *lab = [[UIView alloc] initWithFrame:cell.frame];
    //       [lab setBackgroundColor:[UIColor blueColor]];

    if (indexPath.row % 2) {
        cell.contentView.backgroundColor = [[[UIColor alloc]initWithRed:87.0/255.0 green:84.0/255.0 blue:229.0/255.0 alpha:1] autorelease];
    } else {
        cell.contentView.backgroundColor = [[[UIColor alloc]initWithRed:187.0/255.0 green:184.0/255.0 blue:229.0/255.0 alpha:1] autorelease];
    }

    …

    return cell;
}

Ihre Methode hat Probleme, weil blind vorausgesetzt Zellen werden gebeten, in abwechselnden Paaren ist eine falsche Annahme. Der tableView Fragen konnte für die Zellen in beliebiger Reihenfolge wählt. In deinem Beispiel, ich glaube Zellen könnte gefragt werden, wie folgt. First, 0, 1,..., 9 sind gefragt. Als Nächstes scrollen Sie nach unten und 10, 11 und 12 geholt. An dieser Stelle 0, 1 und 2 haben den Weg aus dem Bildschirm. Sie Blättern Sie zurück und 2 gefragt ist, aber oh Nein, dein Modell ist auf eine ungerade Zahl ist Wechsel, so bekommt man die falsche Farbe.

Den geeigneten Ort, um zu ändern Ihre Zelle Hintergrundfarbe wäre die " cellForRowAtIndexPath: " - Methode, bei der Zellen-Daten ausgefüllt wird und zurück in die Tabellenansicht.

Einen Weg, dies zu tun wäre: Wenn die Daten geht in die Zelle, ändern Sie die Hintergrundfarbe, je nachdem, welche Zeile du gerade bist.

Schauen was ich mit anpassen meine Tabelle

- (UITableViewCell *)tableView:(UITableView *)aTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
#if USE_CUSTOM_DRAWING
    const NSInteger TOP_LABEL_TAG = 1001;
    const NSInteger BOTTOM_LABEL_TAG = 1002;
    UILabel *topLabel;
    UILabel *bottomLabel;
#endif

    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [aTableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        //
        //Create the cell.
        //
        cell =
            [[[UITableViewCell alloc]
                initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]
            autorelease];

#if USE_CUSTOM_DRAWING
        UIImage *indicatorImage = [UIImage imageNamed:@"indicator.png"];
        cell.accessoryView =
            [[[UIImageView alloc]
                initWithImage:indicatorImage]
            autorelease];

        const CGFloat LABEL_HEIGHT = 20;
        UIImage *image = [UIImage imageNamed:@"imageA.png"];

        //
        //Create the label for the top row of text
        //
        topLabel =
            [[[UILabel alloc]
                initWithFrame:
                    CGRectMake(
                        image.size.width + 2.0 * cell.indentationWidth,
                        0.5 * (aTableView.rowHeight - 2 * LABEL_HEIGHT),
                        aTableView.bounds.size.width -
                            image.size.width - 4.0 * cell.indentationWidth
                                - indicatorImage.size.width,
                        LABEL_HEIGHT)]
            autorelease];
        [cell.contentView addSubview:topLabel];

        //
        //Configure the properties for the text that are the same on every row
        //
        topLabel.tag = TOP_LABEL_TAG;
        topLabel.backgroundColor = [UIColor clearColor];
        topLabel.textColor = [UIColor colorWithRed:0.25 green:0.0 blue:0.0 alpha:1.0];
        topLabel.highlightedTextColor = [UIColor colorWithRed:1.0 green:1.0 blue:0.9 alpha:1.0];
        topLabel.font = [UIFont systemFontOfSize:[UIFont labelFontSize]];

        //
        //Create the label for the top row of text
        //
        bottomLabel =
            [[[UILabel alloc]
                initWithFrame:
                    CGRectMake(
                        image.size.width + 2.0 * cell.indentationWidth,
                        0.5 * (aTableView.rowHeight - 2 * LABEL_HEIGHT) + LABEL_HEIGHT,
                        aTableView.bounds.size.width -
                            image.size.width - 4.0 * cell.indentationWidth
                                - indicatorImage.size.width,
                        LABEL_HEIGHT)]
            autorelease];
        [cell.contentView addSubview:bottomLabel];

        //
        //Configure the properties for the text that are the same on every row
        //
        bottomLabel.tag = BOTTOM_LABEL_TAG;
        bottomLabel.backgroundColor = [UIColor clearColor];
        bottomLabel.textColor = [UIColor colorWithRed:0.25 green:0.0 blue:0.0 alpha:1.0];
        bottomLabel.highlightedTextColor = [UIColor colorWithRed:1.0 green:1.0 blue:0.9 alpha:1.0];
        bottomLabel.font = [UIFont systemFontOfSize:[UIFont labelFontSize] - 2];

        //
        //Create a background image view.
        //
        cell.backgroundView =
            [[[UIImageView alloc] init] autorelease];
        cell.selectedBackgroundView =
            [[[UIImageView alloc] init] autorelease];
#endif
    }

#if USE_CUSTOM_DRAWING
    else
    {
        for (UIView *sub in [cell.contentView subviews]) {
//           if([sub class] == [UITableViewCellContentView class])
                NSLog(@"this is uilabel %@",[sub class]);
        }
        topLabel = (UILabel *)[cell viewWithTag:TOP_LABEL_TAG];
        bottomLabel = (UILabel *)[cell viewWithTag:BOTTOM_LABEL_TAG];
    }

    topLabel.text = [NSString stringWithFormat:@"Cell at row %ld.", [indexPath row]];
    bottomLabel.text = [NSString stringWithFormat:@"Some other information.", [indexPath row]];

    //
    //Set the background and selected background images for the text.
    //Since we will round the corners at the top and bottom of sections, we
    //need to conditionally choose the images based on the row index and the
    //number of rows in the section.
    //
    UIImage *rowBackground;
    UIImage *selectionBackground;
    NSInteger sectionRows = [aTableView numberOfRowsInSection:[indexPath section]];
    NSInteger row = [indexPath row];
    if (row == 0 && row == sectionRows - 1)
    {
        rowBackground = [UIImage imageNamed:@"topAndBottomRow.png"];
        selectionBackground = [UIImage imageNamed:@"topAndBottomRowSelected.png"];
    }
    else if (row == 0)
    {
        rowBackground = [UIImage imageNamed:@"topRow.png"];
        selectionBackground = [UIImage imageNamed:@"topRowSelected.png"];
    }
    else if (row == sectionRows - 1)
    {
        rowBackground = [UIImage imageNamed:@"bottomRow.png"];
        selectionBackground = [UIImage imageNamed:@"bottomRowSelected.png"];
    }
    else
    {
        rowBackground = [UIImage imageNamed:@"middleRow.png"];
        selectionBackground = [UIImage imageNamed:@"middleRowSelected.png"];
    }
    ((UIImageView *)cell.backgroundView).image = rowBackground;
    ((UIImageView *)cell.selectedBackgroundView).image = selectionBackground;
// cell.backgroundView.backgroundColor = [UIColor colorWithPatternImage:rowBackground];
//   cell.selectedBackgroundView.backgroundColor = [UIColor colorWithPatternImage:selectionBackground];
    //
    //Here I set an image based on the row. This is just to have something
    //colorful to show on each row.
    //
    if ((row % 3) == 0)
    {
        cell.imageView.image = [UIImage imageNamed:@"imageA.png"];
    }
    else if ((row % 3) == 1)
    {
        cell.imageView.image = [UIImage imageNamed:@"imageB.png"];
    }
    else
    {
        cell.imageView.image = [UIImage imageNamed:@"imageC.png"];
    }
#else
    cell.text = [NSString stringWithFormat:@"Cell at row %ld.", [indexPath row]];
#endif

    return cell;
}

Vergangenheit, nachdem alle #import Linien

#define USE_CUSTOM_DRAWING 1

if(cell.contentView)
{
    [cell.nameLbl setFont:[UIFont systemFontOfSize:24]];
    int red_value = arc4random() % 210;
    int green_value = arc4random() % 210;
    int blue_value = arc4random() % 210;

    cell.contentView.backgroundColor = [UIColor colorWithRed:red_value/255.0 green:green_value/255.0 blue:blue_value/255.0 alpha:0.6];

}