重新加载tableview的活动单元格(Reloading Active cells of tableview)

 我正在开发iOS iOS 7.0及更高版本的应用程序。 现在，我的问题是如何重新加载屏幕上可见的UITableView行。 我正在使用动态细胞。 
 
 实际上在选择一个选项时，我正在改变一些颜色，比如每个单元格的标题颜色，但是那些已经加载到屏幕上的单元格没有改变，如果我正在加载整个表格，那么它需要很长时间。 
 
 等待您的回复。 
 
 码 
 
 //点击此按钮颜色正在更新 
 
- (IBAction)btnDone:(id)sender {

appDel.selectedMood=_moodDetView.str;

appDel.barColor=_moodDetView.backgroundColor;

self.navigationController.navigationBar.barTintColor = _moodDetView.backgroundColor;

//[self.mainTblView reloadData];

[self.menuView setBackgroundColor:appDel.barColor];

[_moodDetView setHidden:YES];
 
 } 
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath     *)indexPath
  {
    //For menu contents
    if (tableView.tag==2) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
            cell.textLabel.textColor = [UIColor whiteColor];
            cell.textLabel.font = [UIFont fontWithName:@"Futura" size:14.0];
            cell.textLabel.textAlignment = NSTextAlignmentCenter;
            cell.backgroundColor = [UIColor clearColor];
        }

        switch (indexPath.row) {
            case 0:
            {
                cell.textLabel.text=@"Select Mood";
            }
                break;
            case 1:
            {
                cell.textLabel.text=@"Search by Author";
            }
                break;
            case 2:
            {
               cell.textLabel.text=@"Search by Category";
            }
                break;
            case 3:
            {
                  cell.textLabel.text=@"Favorites";
            }
                break;
            case 4:
            {
                    cell.textLabel.text=@"Feeds";
            }
                break;

            default:
                break;
        }
        return cell;
    }

    //for main table
    else{

    // Configure the cell...

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    FeedCustomCell* CELL=( FeedCustomCell *)cell;

    CELL.cellImageView.layer.cornerRadius=CELL.cellImageView.frame.size.width/2;

    CELL.cellImageView.clipsToBounds=YES;

    CELL.gesRec=[[CustomTapGestureRecognizer alloc]initWithTarget:self action:@selector(authorBtnTouched:)];

    [CELL.lblAuthName setTextAlignment:NSTextAlignmentJustified];

    [CELL.lblAuthName setTextColor:[AppDelegate invertColor:appDel.barColor]];

        NSString * str=[NSString stringWithFormat:@"%@",[[dataArray objectAtIndex:indexPath.row] objectForKey:@"authorId"]];

    UIImage * img=[UIImage imageNamed:str];

    CELL.cellImageView.image=img?img:[UIImage imageNamed:@"n3"];

    [CELL.lblAuthName addGestureRecognizer:CELL.gesRec];

    CELL.gesRec.authorImage=CELL.cellImageView.image;

    NSString * authName=[[dataArray objectAtIndex:indexPath.row] objectForKey:@"authorName"];

    [CELL.lblAuthName setText:authName];

    [CELL.gesRec setAuthorId:(int)str.integerValue];

    [CELL.gesRec setAuthorName:authName];

    [CELL.txtViewQuote setTextColor:appDel.barColor];

    CELL.txtViewQuote.text=[[dataArray objectAtIndex:indexPath.row] objectForKey:@"quoteTxt"];

    CGSize sizeThatShouldFitTheContent = [CELL.txtViewQuote sizeThatFits:CELL.txtViewQuote.frame.size];

    CELL.heightConstraintOfTxtView.constant = sizeThatShouldFitTheContent.height;

    [CELL.contentView sizeToFit];

    return CELL;

    }


}
 
 问候：Syed Meesum Ali 
 
 初级软件开发人员 

I'm developing an application on iOS targeting iOS 7.0 and later. Now, my question is that how to reload the rows of a UITableView which are visible on screen. I'm using dynamic cells.
 
Actually while selecting an option I'm changing some colors like title color of each cell but those cells which are already loaded on screen are not changed and if I'm loading whole table then its taking a long time.
 
Waiting for your kind reply.
 
Code
 
//on clicking this button color is updating
 
- (IBAction)btnDone:(id)sender {

appDel.selectedMood=_moodDetView.str;

appDel.barColor=_moodDetView.backgroundColor;

self.navigationController.navigationBar.barTintColor = _moodDetView.backgroundColor;

//[self.mainTblView reloadData];

[self.menuView setBackgroundColor:appDel.barColor];

[_moodDetView setHidden:YES];
 
}
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath     *)indexPath
  {
    //For menu contents
    if (tableView.tag==2) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
        if (cell == nil) {
            cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"Cell"];
            cell.textLabel.textColor = [UIColor whiteColor];
            cell.textLabel.font = [UIFont fontWithName:@"Futura" size:14.0];
            cell.textLabel.textAlignment = NSTextAlignmentCenter;
            cell.backgroundColor = [UIColor clearColor];
        }

        switch (indexPath.row) {
            case 0:
            {
                cell.textLabel.text=@"Select Mood";
            }
                break;
            case 1:
            {
                cell.textLabel.text=@"Search by Author";
            }
                break;
            case 2:
            {
               cell.textLabel.text=@"Search by Category";
            }
                break;
            case 3:
            {
                  cell.textLabel.text=@"Favorites";
            }
                break;
            case 4:
            {
                    cell.textLabel.text=@"Feeds";
            }
                break;

            default:
                break;
        }
        return cell;
    }

    //for main table
    else{

    // Configure the cell...

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    FeedCustomCell* CELL=( FeedCustomCell *)cell;

    CELL.cellImageView.layer.cornerRadius=CELL.cellImageView.frame.size.width/2;

    CELL.cellImageView.clipsToBounds=YES;

    CELL.gesRec=[[CustomTapGestureRecognizer alloc]initWithTarget:self action:@selector(authorBtnTouched:)];

    [CELL.lblAuthName setTextAlignment:NSTextAlignmentJustified];

    [CELL.lblAuthName setTextColor:[AppDelegate invertColor:appDel.barColor]];

        NSString * str=[NSString stringWithFormat:@"%@",[[dataArray objectAtIndex:indexPath.row] objectForKey:@"authorId"]];

    UIImage * img=[UIImage imageNamed:str];

    CELL.cellImageView.image=img?img:[UIImage imageNamed:@"n3"];

    [CELL.lblAuthName addGestureRecognizer:CELL.gesRec];

    CELL.gesRec.authorImage=CELL.cellImageView.image;

    NSString * authName=[[dataArray objectAtIndex:indexPath.row] objectForKey:@"authorName"];

    [CELL.lblAuthName setText:authName];

    [CELL.gesRec setAuthorId:(int)str.integerValue];

    [CELL.gesRec setAuthorName:authName];

    [CELL.txtViewQuote setTextColor:appDel.barColor];

    CELL.txtViewQuote.text=[[dataArray objectAtIndex:indexPath.row] objectForKey:@"quoteTxt"];

    CGSize sizeThatShouldFitTheContent = [CELL.txtViewQuote sizeThatFits:CELL.txtViewQuote.frame.size];

    CELL.heightConstraintOfTxtView.constant = sizeThatShouldFitTheContent.height;

    [CELL.contentView sizeToFit];

    return CELL;

    }


}
 
regards: Syed Meesum Ali
 
Junior Software Developer

原文：https://stackoverflow.com/questions/27860288