我对 UITableViewCell 进行了子类化以向其添加自定义外观。在 MYTableViewCell 的初始级别,我添加了 4 个子视图:UIImageView 和三个 UILabel(s)。所有 4 个子视图都分配有不同的标签。
在 cellForRowAtIndexPath 方法中,如果一开始不可用,我要么创建一个新单元格,要么重用可用的单元格并将正确的文本分配给 ui 标签。
我遇到的问题是,如果我尝试超快滚动,那么数据就会变得混乱,但是如果我上下滚动得更慢,那么一切正常。
有什么想法吗??
下面是代码:
- (MyTableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"itemListTableViewCell";
MyTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
DisplayableEntity *displayableEntity = [self.fetchedResultsController objectAtIndexPath:indexPath];
if( ! cell ) {
cell = [[MyTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[self tableView:tableView appearanceForCell:cell withEntity:displayableEntity];
} else {
UIImageView *imageView = (UIImageView *) [cell viewWithTag:IMAGEVIEW_TAG];
imageView.image = [UIImage imageNamed:displayableEntity.displayImageName];
UILabel *titleLabel = (UILabel *) [cell viewWithTag:TITLEVIEW_TAG];
titleLabel.text = displayableEntity.entityName;
UILabel *itemDescription = (UILabel *) [cell viewWithTag:DESCRIPTION_TAG];
itemDescription.text = displayableEntity.entityDesctiption;
}
}
// some code removed to make it brief
- (void)tableView:(UITableView *)tableView appearanceForCell:(MyTableViewCell *)cell withEntity:(DisplayableEntity *)entity {
// cell image view
UIImageView *cellImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:[entity displayImageName]]];
[cellImageView setTag:IMAGEVIEW_TAG];
[cell addSubview:cellImageView];
// adding entity name label
UILabel *itemTitleName = [self itemTitleNameLabelWithFrame:itemNameLabelRect itemName:[entity entityName]];
[itemTitleName setTag:TITLEVIEW_TAG];
[cell addSubview:itemTitleName];
// adding 'assigned to' label right under the item name label
UILabel *itemDescriptionLabel = [self itemDescriptionLabelWithFrame:descriptionLabelFrame itemDescription:[entity entityDesctiption]];
[itemDescriptionLabel setTag:DESCRIPTION_TAG];
[cell addSubview:itemDescriptionLabel];
}