Question

我遇到了问题，描述它的最佳方式是向您展示图片。该部分的最后一行应该是一个光泽样式和文本对齐中心。首先，我有一个表格，其中一个部分是这样的：

http://image-upload.de/image/RL93lJ/58f2422d97.png

但是当我在顶部添加另一个部分时，我会得到类似的结果：

http://image-upload.de/image/JggrVq/6ee42a1089.png

以下是简短形式的代码：

static NSString *CellIdentifier = @"CellOrder";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cellIsLastOne == TRUE) {

        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
        cell.selectionStyle = UITableViewCellSelectionStyleGray;
        //name


        cell.textLabel.text = @"Bezahlt";
        cell.textLabel.textAlignment = NSTextAlignmentCenter;

        cell.textLabel.font =[UIFont fontWithName:@"Avenir" size:25];

        cell.textLabel.textColor =  [UIColor whiteColor];

        //Glossy
        CALayer *thisLayer = cell.layer;
        if (thisLayer.sublayers.count == 1) {
            CAGradientLayer *glossLayer = [CAGradientLayer layer];
            glossLayer.frame = CGRectMake(cell.bounds.origin.x + cellOffset, cell.bounds.origin.y, self.tableView.frame.size.width - cellOffset * 2, cellItemHeight);
            glossLayer.colors = [NSArray arrayWithObjects:
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.4f].CGColor,
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
                                 (id)[UIColor colorWithWhite:0.75f alpha:0.0f].CGColor,
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
                                 nil];
            glossLayer.locations = [NSArray arrayWithObjects:
                                    [NSNumber numberWithFloat:0.0f],
                                    [NSNumber numberWithFloat:0.5f],
                                    [NSNumber numberWithFloat:0.5f],
                                    [NSNumber numberWithFloat:1.0f],
                                    nil];
            [thisLayer addSublayer:glossLayer];
        }

    } else {
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier];
            cell.accessoryType = UITableViewCellAccessoryNone;
        }
        cell.selectionStyle = UITableViewCellSelectionStyleNone;

        ItemID;

        cell.textLabel.text = @"Name";
        cell.detailTextLabel.text = @"Price";
        cell.detailTextLabel.textColor = [UIColor whiteColor];


        cell.textLabel.font =[UIFont fontWithName:@"Avenir" size:20];
        cell.detailTextLabel.font =[UIFont fontWithName:@"Avenir" size:20];

        cell.textLabel.textColor =  [UIColor whiteColor];

    }

    cell.detailTextLabel.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.4];
    cell.textLabel.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.4];

    cell.detailTextLabel.shadowOffset = CGSizeMake(0, 2);
    cell.textLabel.shadowOffset = CGSizeMake(0, 2);

    cell.backgroundColor = [UIColor colorWithRed:0.72 green:0.76 blue:0.03 alpha:1.0];
    cell.textLabel.backgroundColor = [UIColor clearColor];
    cell.detailTextLabel.backgroundColor = [UIColor clearColor];

    return cell;

我真的不明白这个问题。请帮我。谢谢！ ;）

Answer 1

嗯，屏幕截图显示的问题表明您对cellIsLastOne的计算错误。

但即使它是正确的，当你滚动表格视图时会出现很多问题，因为正在重复使用单元格。要修复，您可以：

为光泽单元格使用不同的重复使用标识符
删除else块

基本上，当您致电dequeueReusableCellWithIdentifier:时，它可能会返回您之前添加了光泽图层的单元格。此外，这可以多次添加光泽层。

Answer 2

我编辑可能对您有帮助的代码。

    static NSString *CellIdentifier = @"CellOrder";
    static NSString *glowCellIdentifier = @"glowCellOrder";
    UITableViewCell *cell = nil;
    if (cellIsLastOne == TRUE) {
        cell = [tableView dequeueReusableCellWithIdentifier:glowCellIdentifier];
    } else {
        cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    }

     if (cell == nil) {
          if (cellIsLastOne == TRUE) {
             cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:glowCellIdentifier];  
             cell.selectionStyle = UITableViewCellSelectionStyleGray;
          } else {
             cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
             cell.selectionStyle = UITableViewCellSelectionStyleNone;
          }
            cell.accessoryType = UITableViewCellAccessoryNone;
        }

    if (cellIsLastOne == TRUE) {
        //name

        cell.textLabel.text = @"Bezahlt";
        cell.textLabel.textAlignment = NSTextAlignmentCenter;

        cell.textLabel.font =[UIFont fontWithName:@"Avenir" size:25];

        cell.textLabel.textColor =  [UIColor whiteColor];

        //Glossy
        CALayer *thisLayer = cell.layer;
        if (thisLayer.sublayers.count == 1) {
            CAGradientLayer *glossLayer = [CAGradientLayer layer];
            glossLayer.frame = CGRectMake(cell.bounds.origin.x + cellOffset, cell.bounds.origin.y, self.tableView.frame.size.width - cellOffset * 2, cellItemHeight);
            glossLayer.colors = [NSArray arrayWithObjects:
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.4f].CGColor,
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
                                 (id)[UIColor colorWithWhite:0.75f alpha:0.0f].CGColor,
                                 (id)[UIColor colorWithWhite:1.0f alpha:0.2f].CGColor,
                                 nil];
            glossLayer.locations = [NSArray arrayWithObjects:
                                    [NSNumber numberWithFloat:0.0f],
                                    [NSNumber numberWithFloat:0.5f],
                                    [NSNumber numberWithFloat:0.5f],
                                    [NSNumber numberWithFloat:1.0f],
                                    nil];
            [thisLayer addSublayer:glossLayer];
        }

    } else {       

        ItemID;

        cell.textLabel.text = @"Name";
        cell.detailTextLabel.text = @"Price";
        cell.detailTextLabel.textColor = [UIColor whiteColor];


        cell.textLabel.font =[UIFont fontWithName:@"Avenir" size:20];
        cell.detailTextLabel.font =[UIFont fontWithName:@"Avenir" size:20];

        cell.textLabel.textColor =  [UIColor whiteColor];

    }

    cell.detailTextLabel.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.4];
    cell.textLabel.shadowColor = [UIColor colorWithWhite:0.0 alpha:0.4];

    cell.detailTextLabel.shadowOffset = CGSizeMake(0, 2);
    cell.textLabel.shadowOffset = CGSizeMake(0, 2);

    cell.backgroundColor = [UIColor colorWithRed:0.72 green:0.76 blue:0.03 alpha:1.0];
    cell.textLabel.backgroundColor = [UIColor clearColor];
    cell.detailTextLabel.backgroundColor = [UIColor clearColor];

    return cell;

此代码可以有效地重用单元格并节省内存。

不同节行中的iOS Tableview单元格具有相同的布局

2 个答案: