在UITableViewCell中处理数据对象

Question

我想将两行之间的所有内容移动到detailCell.m中，以便cellForRowAtIndexPath中唯一的代码是其余三行。 最有效的方法是什么？ 谢谢。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    DetailCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DetailCell" forIndexPath:indexPath];
    Job *aJob = self.jobs[indexPath.row];

 _______________
    [cell.titleLabel setText:aJob.title];
    [cell.companyLabel setText:aJob.company];

    if (aJob.logo != (NSString *)[NSNull null]) {
        [cell.logoImageView setImageWithURL:[NSURL URLWithString:aJob.logo] placeholderImage:[UIImage imageNamed:@"placeholder.jpg"]];
    }
    else {
        [cell.logoImageView setImage:[UIImage imageNamed:@"placeholder.jpg"]];
    }
_________________
    return cell;
}

这是DetailCell.h。 DetailCell.m当前为空。

@interface DetailCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
@property (weak, nonatomic) IBOutlet UILabel *companyLabel;
@property (weak, nonatomic) IBOutlet UIImageView *logoImageView;
@end

Answer 1

在DetailCell.h中创建一个类似于以下内容的方法：

- (void)configureCell:(Job *)aJob atIndexPath:(NSIndexPath *)indexPath;

并根据需要在DetailCell.m中实现它：

- (void)configureCell:(Job *)aJob atIndexPath:(NSIndexPath *)indexPath {
  [self.titleLabel setText:aJob.title];
  [self.companyLabel setText:aJob.company];

  if (aJob.logo != (NSString *)[NSNull null]) {
    [self.logoImageView setImageWithURL:[NSURL URLWithString:aJob.logo] placeholderImage:[UIImage imageNamed:@"placeholder.jpg"]];
  } else {
    [self.logoImageView setImage:[UIImage imageNamed:@"placeholder.jpg"]];
  }
}

就是这样...当您执行此操作时，在cellForRowAtIndexPath方法中需要做的就是：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  DetailCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DetailCell" forIndexPath:indexPath];
  Job *aJob = self.jobs[indexPath.row];
  [cell configureCell:aJob atIndexPath: indexPath];
  return cell;
}

您实际上不需要那种cell方法中的indexPatin，但是我有一种习惯，总是将其传递到cell中，因为通常可以使用它：)

Answer 2

DetailCell.h

@class Job;
@interface DetailCell : UITableViewCell
@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
@property (weak, nonatomic) IBOutlet UILabel *companyLabel;
@property (weak, nonatomic) IBOutlet UIImageView *logoImageView;
-(void) setJobDetail:(Job*) aJob;
@end

在DetailCell.m中，添加以下方法，并导入Job.h。

-(void) setJobDetail:(Job*) aJob{
    [self.titleLabel setText:aJob.title];
    [self.companyLabel setText:aJob.company];

    if (aJob.logo != (NSString *)[NSNull null]) {
        [self.logoImageView setImageWithURL:[NSURL URLWithString:aJob.logo] placeholderImage:[UIImage imageNamed:@"placeholder.jpg"]];
    }
    else {
        [self.logoImageView setImage:[UIImage imageNamed:@"placeholder.jpg"]];
    }
}

之后，您的cellForRowAtIndex更改为。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    DetailCell *cell = [tableView dequeueReusableCellWithIdentifier:@"DetailCell" forIndexPath:indexPath];
    Job *aJob = self.jobs[indexPath.row];

    [cell setJobDetail:aJob];

    return cell;
}