带搜索显示控制器的UITableView具有较慢的初始滚动

Question

我有UITableView实施了搜索栏。我正在使用从xib加载的自定义单元格，其中包含7 UILabels。当我通过搜索栏输入数据时，初始滚动总是很慢。我将尝试向下滚动searchResultsTableView，并且那里有明显的延迟。之后，滚动表格是流动的。滞后仅在第一次滚动新搜索时出现。

我还在不同的tableview上使用了相同的自定义单元格，并且似乎使用相同的cellForRowAtIndexPath逻辑滚动。

如何使searchResultsTableView上的延迟消失？

以下是一些代码：

 //SchoolCell.h
 //All labels are hooked up from the SchoolCell.xib to SchoolCell.h
 //I haven't touched SchoolCell.m

 @property (strong, nonatomic) IBOutlet UILabel *schoolNameLabel;
 @property (strong, nonatomic) IBOutlet UILabel *locationLabel;
 @property (strong, nonatomic) IBOutlet UILabel *averageGPALabel;
 @property (strong, nonatomic) IBOutlet UILabel *averageLabel;
 @property (strong, nonatomic) IBOutlet UILabel *tuitionLabel;
 @property (strong, nonatomic) IBOutlet UILabel *rankLabel;

在MainViewController.m中（有一个包含数据源和委托的表视图）

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
[tableView registerNib:[UINib nibWithNibName:@"SchoolCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:CellIdentifier];
SchoolCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil)
{
    cell = [[SchoolCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];     
}

RankedSchool *rankedSchool = nil;
UnrankedSchool *unrankedSchool = nil;

if(tableView == self.searchDisplayController.searchResultsTableView){

    switch (indexPath.section) {
        {case 0:
            cell.rankLabel.hidden = NO;
            rankedSchool = [self.filteredRankedSchoolsArray objectAtIndex:indexPath.row];
            cell.schoolNameLabel.text = rankedSchool.name;
            NSString* locationText = [NSString stringWithFormat:@"%@, %@",rankedSchool.city, rankedSchool.state];
            cell.locationLabel.text = locationText;
            NSString* averageGPAText = [NSString stringWithFormat:@"Average GPA: %@",rankedSchool.gpaExpected];
            cell.averageGPALabel.text = averageGPAText;
            NSString* averageText = [NSString stringWithFormat:@"Average: %@",rankedSchool.minAvg];
            cell.averageLabel.text = averageText;
            NSString* tuitionText = [NSString stringWithFormat:@"$%@",rankedSchool.nonresidentTuition];
            cell.tuitionLabel.text = tuitionText;
            NSString* rankText = [NSString stringWithFormat:@"Rank: %@",rankedSchool.rank];
            cell.rankLabel.text = rankText;

            break;}
        {case 1:
            cell.rankLabel.hidden = YES;
            unrankedSchool = [self.filteredUnrankedSchoolsArray objectAtIndex:indexPath.row];
            cell.schoolNameLabel.text = unrankedSchool.name;
            NSString* locationText = [NSString stringWithFormat:@"%@, %@",unrankedSchool.city, unrankedSchool.state];
            cell.locationLabel.text = locationText;
            NSString* averageGPAText = [NSString stringWithFormat:@"Average GPA: %@",unrankedSchool.gpaExpected];
            cell.averageGPALabel.text = averageGPAText;
            NSString* averageText = [NSString stringWithFormat:@"Average: %@",unrankedSchool.minAvg];
            cell.averageLabel.text = averageText;
            NSString* tuitionText = [NSString stringWithFormat:@"$%@",unrankedSchool.nonresidentTuition];
            cell.tuitionLabel.text = tuitionText;

            break;}

        {default:
            break;}
    }

} else{
   //searchBar is firstResponder. User never interacts with tableview, only searchResultsTableView
}

return cell;

}