ios - tableView中的两种类型的单元格-优雅

Question

您如何优雅编码同一tableView中的两种类型的单元格？

显然我可以这样:

NSDictionary *cellInfo = [_userInformation objectAtIndex:indexPath.row];
NSString *cellType = [cellInfo objectForKey:@"type"];
if ([cellType isEqualToString:kProfileImage]) {
    ProfileImageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"profileImageCell"];
    cell.descriptionLabel.text = [cellInfo objectForKey:@"cellLabelText"];
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    return cell;
}
else {
    AccountCell *cell = [tableView dequeueReusableCellWithIdentifier:@"AccountCell"];
    cell.descriptionLabel.text = [cellInfo objectForKey:@"cellLabelText"];
    cell.textField.placeholder = [cellInfo objectForKey:@"textFieldPlaceholder"];
    cell.textField.delegate = self;
    cell.textField.clearButtonMode = UITextFieldViewModeWhileEditing;
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    return cell;
}
return nil;

但是我的老师总是告诉我，如果在两种情况下都发生两次写错了，并且如您所见，这两种情况中的三行相同。我想将它们移至if之外，而只将每种情况下的特定行留在if主体中。

Answer 1

通过根据类型实例化单元格，但将单元格定义为UITableViewCell并在方法末尾返回实例，可以做得更好。这也将允许您为这些单元格可能共享的每个 public 属性只写一行。就像是:

UICustomTableViewCell *cell = nil; //This cell type is a common super class of both cell classes
NSDictionary *cellInfo = [_userInformation objectAtIndex:indexPath.row];
NSString *cellType = [cellInfo objectForKey:@"type"];
if ([cellType isEqualToString:kProfileImage]) {
    cell = [tableView dequeueReusableCellWithIdentifier:@"profileImageCell"];
}
else 
{
    cell = [tableView dequeueReusableCellWithIdentifier:@"AccountCell"];
    ((AccountCell*) cell).textField.placeholder = [cellInfo objectForKey:@"textFieldPlaceholder"];
    ((AccountCell*) cell).textField.delegate = self;
    ((AccountCell*) cell).textField.clearButtonMode = UITextFieldViewModeWhileEditing;
}
cell.delegate = self;
cell.descriptionLabel.text = [cellInfo objectForKey:@"cellLabelText"];
[cell setSelectionStyle:UITableViewCellSelectionStyleNone];
//Any other common properties can by assigned here

return cell;

在此示例中，两种单元格类型都有一个共同的“代理”属性。