Question

使用自定义单元格加载tableview后，所有看起来都很好，向下滚动就可以了。当我向上滚动时，上面的单元格显示为空白。它们实际上是完全正常的，因为它们仍然可以被选中然后它们进入细节页面。对返回的行执行代码cellForRowAtIndexPath，并按照我期望的正确细节返回单元格。它只是没有显示。任何想法/帮助将不胜感激。

以下代码就是我一直在使用的。

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


    static NSString *CustomCellIdentifier = @"CustomCellIdentifier";

    CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CustomCellIdentifier];
    if (cell == nil) {

        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil];
        for (id oneObject in nib) {
            if ([oneObject isKindOfClass:[CustomCell class]]) {
                cell = (CustomCell *)oneObject;
            }
        }
    }

    // Configure the cell.


    Book *aBook = [appDelegate.sortedArray objectAtIndex:indexPath.row];


    //name
    NSString *trimmedString = [aBook.Name stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    cell.nameLabel.text = trimmedString;
    //catagory
    NSString *trimmedExperience = [aBook.PrimaryExperience stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    if ([trimmedExperience isEqualToString:@"1"]) {
        cell.catagoryLabel.text = @"None";
    }
    else if([trimmedExperience isEqualToString:@"2"]){
        cell.catagoryLabel.text = @"Limited";
    }
    else if ([trimmedExperience isEqualToString:@"4"]) {
        cell.catagoryLabel.text = @"Full";

    }
    else {
        cell.catagoryLabel.text = @"";

    }




    cell.distanceLabel.text = [NSString stringWithFormat:@"%1.1f",aBook.distance];


    cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;


    return cell;
}

Answer 1

问题在于xib文件及其加载方式。为了解决问题并获得完全控制，以下代码替换了自定义单元格的IB版本。

    static NSString *CellTableIdentifier = @"CellTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellTableIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellTableIdentifier] autorelease];
    CGRect nameLabelRect = CGRectMake(15, 5, 200, 15);
    UILabel *nameLabel = [[UILabel alloc] initWithFrame:nameLabelRect];
    nameLabel.textAlignment = UITextAlignmentLeft;
    nameLabel.font = [UIFont boldSystemFontOfSize:14];
    nameLabel.tag = kNameTag;
    [cell.contentView addSubview:nameLabel];
    [nameLabel release];

    CGRect catagoryLabelRect = CGRectMake(15, 26, 100, 15);
    UILabel *catagoryLabel = [[UILabel alloc]initWithFrame:catagoryLabelRect];
    catagoryLabel.textAlignment = UITextAlignmentLeft;
    catagoryLabel.font = [UIFont systemFontOfSize:12];
    catagoryLabel.tag = kExperienceTag;
    [cell.contentView addSubview:catagoryLabel];
    [catagoryLabel  release];

    CGRect distanceLabelRect = CGRectMake(210, 26, 70, 15);
    UILabel *distanceLabel = [[UILabel alloc] initWithFrame:distanceLabelRect];
    distanceLabel.textAlignment = UITextAlignmentRight;
    distanceLabel.font = [UIFont boldSystemFontOfSize:12];
    distanceLabel.tag = kDistanceTag;
    [cell.contentView addSubview:distanceLabel];
    [distanceLabel release];
}

感谢您帮助思考这一点。现在滚动效果非常好。

当再次滚动一个tableview时，单元格显示为空白？

1 个答案: