UITableView和单元重用

我有一个UITableView和我已经分类UITableViewCell （称为CustomCell ），所以它有几个标签和一个UIImageView 。

只有特定的单元格才会显示图像。 这是我的代码为tableView:cellForRowAtIndexPath: ::

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { Match *aMatch = [[appDelegate.matchByDate objectAtIndex:indexPath.section] objectAtIndex:indexPath.row]; static NSString *CellIdentifier = @"Cell"; CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[CustomCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } cell.homeLabel.text = aMatch.homeTeam; cell.awayLabel.text = aMatch.awayTeam; cell.timeLabel.text = aMatch.koTime; cell.tournamentLabel.text = aMatch.tournament; NSString *tempString = [appDelegate.teamLogos objectForKey:[aMatch homeTeam]]; if (tempString!=nil) { cell.homeImageView.image = [UIImage imageNamed:tempString]; } return cell; } 

所以当它在我设置的字典中find相应的图像时，它只设置homeImageView 。 这似乎适用于前几个单元格，但如果我滚动列表，我发现单元格有一个图像时，他们不应该有一个。

我明白这可能是因为细胞被重新使用，但我设置homeImageView之后，单元格已被创build/重用？

这里是我的CustomCell类的init方法

  - (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) { // Initialization code tournamentLabel = [[UILabel alloc] init]; tournamentLabel.textAlignment = UITextAlignmentCenter; tournamentLabel.font = [UIFont systemFontOfSize:12]; tournamentLabel.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0]; tournamentLabel.textColor = [UIColor darkGrayColor]; homeLabel = [[UILabel alloc]init]; homeLabel.textAlignment = UITextAlignmentLeft; homeLabel.font = [UIFont systemFontOfSize:16]; homeLabel.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0]; awayLabel = [[UILabel alloc]init]; awayLabel.textAlignment = UITextAlignmentRight; awayLabel.font = [UIFont systemFontOfSize:16]; awayLabel.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0]; timeLabel = [[UILabel alloc]init]; timeLabel.textAlignment = UITextAlignmentCenter; timeLabel.font = [UIFont systemFontOfSize:30]; timeLabel.backgroundColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.0]; timeLabel.textColor = [UIColor darkGrayColor]; homeImageView = [[UIImageView alloc]init]; awayImageView = [[UIImageView alloc]init]; [self.contentView addSubview:homeLabel]; [self.contentView addSubview:awayLabel]; [self.contentView addSubview:timeLabel]; [self.contentView addSubview:tournamentLabel]; [self.contentView addSubview:homeImageView]; [self.contentView addSubview:awayImageView]; } return self; } 

Answer 1

如果您没有要显示的图像，则必须清除图像视图：

 ... if (tempString!=nil) { cell.homeImageView.image = [UIImage imageNamed:tempString]; } else { cell.homeImageView.image = nil; } ...