在表格视图中选择一行后，如何访问未选择的行文本标签以更改其颜色

Question

在显示表格视图并选择一行后，我想将所有未选择的行表格文本标签颜色更改为蓝色。当前在 case 语句中我可以更改当前行选择的文本标签，但是在这种情况下，我不知道如何访问其他行的文本标签。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{ 
    switch (indexPath.row) {
        case 0:
          UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
          cell.textLabel.textColor = [UIColor yellowColor];
          //******* NEED TO CHANGE ALL OTHER ROWS TEXT LABEL TO BLUE
          break;
        case 1:
          UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
          cell.textLabel.textColor = [UIColor yellowColor];
          //******* NEED TO CHANGE ALL OTHER ROWS TEXT LABEL TO BLUE 
          break;
        default:
          break;
    }
}

Answer 1

从表格视图的委托管理单元格选择状态将变得非常困难。您可以存储选定单元格的索引路径，调用表格视图的cellForRowAtIndexPath: 方法来获取以前选定的单元格，并重置标签的颜色。但是您不知道以前选择的单元格甚至仍然可见或已加载。

最好使用实现setSelected: 的 UITableViewCell 子类来更新自己的视图。这样，您的表视图委托只需要设置单元格的 selected 属性，并且单元格负责适当地更新其自己的视图。这也将允许您实现 perpareForReuse 以重置单元格的视图，这样您就不必担心重复使用以前选择的单元格并意外地显示处于选定状态的单元格。

Answer 2

保留一个变量，例如一个名为selectedCell 的NSInteger，用于跟踪选定的单元格。将其更改为选定的单元格，然后重新加载可见单元格。 在tableView:cellForRowAtIndexPath: 中，您检查变量并相应地设置标签样式。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    selectedCell = indexPath.row;
    [tableView reloadData];
}

因此，在tableView:cellForRowAtIndexPath:

// format the cell...
if (indexPath.row==self.selectedCell) {
    // style your cell for selected state
}
else {
    // style your cell for non-selected state
}

干杯，
萨沙

Answer 3

- (void)tableView:(UITableView *)tableView 
     didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

  [self setSelectedImageAndTextColorForTableCell:indexPath :tableView];
}

//THIS METHOD IS USED TO RESET THE SELECTED COLORS FOR UIIMAGEVIEW AND UILABEL------
- (void)setSelectedImageAndTextColorForTableCell:(NSIndexPath *)aIndexPath 
               :(UITableView *)aTableView {
    if (!self.LastIndexPath_) {
        if (aTableView == mTableView_) {
            [self setLastIndexPath_:aIndexPath];
        }
    }
    if (self.mLastIndexPath_.row != aIndexPath.row) {
        //If Old Cell.

      UITableViewCell *lOldCell = [aTableView cellForRowAtIndexPath:self.mLastIndexPath_];
      UILabel *lLabel_=(UILabel*)[lOldCell.contentView viewWithTag:1];
      [lLabel_ setTextColor:RGB_A(35, 30, 32, 1)];

      //If User touches on new cell.

      UITableViewCell *lNewCell = [aTableView cellForRowAtIndexPath:aIndexPath];
      UILabel *lLabel_ = (UILabel*)[lNewCell.contentView viewWithTag:1];
      [lLabel_ setTextColor:[UIColor whiteColor]];
      self.mLastIndexPath_ = aIndexPath;


    }else {
        UITableViewCell *lNewCell = [aTableView cellForRowAtIndexPath:aIndexPath];
        if (aTableView == mTableView_) {
            UITableViewCell *lNewCell = [aTableView cellForRowAtIndexPath:aIndexPath];
            UILabel *lLabel_ = (UILabel*)[lNewCell.contentView viewWithTag:1];
            [lLabel_ setTextColor:[UIColor whiteColor]];
            self.mLastIndexPath_ = aIndexPath;
        }
    }
}

希望对您有所帮助 快乐编码

Answer 4

`- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = (UITableViewCell*)[tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"];
    if (nil==cell)
    {
        cell = [[[UITableViewCell alloc]  initWithFrame:CGRectMake(0,0,0,0)] autorelease];
        cell.contentView.backgroundColor=CLEAR_COLOR;
        //Configure cell format for the tableView,
        //Same format for all the three sections.
        int tagCount = 1;
        CGFloat lXCoord = 5,lYCoord = 7,lWidth = 100/*,lHeight = 18*/;
//      for (tagCount = 1; tagCount <= 1; tagCount++) {
            UILabel *lUILabel = [[UILabel alloc]init];
                lUILabel.frame = CGRectMake(lXCoord+10, 0, lWidth, 34);
            lUILabel.backgroundColor = [UIColor clearColor];
            lUILabel.textColor = RGB_A(35, 30, 32, 1);
           lUILabel.highlightedTextColor=WHITE_COLOR;
            lUILabel.font = FONT_OPENSANS_REGULAR(14);
            [cell.contentView addSubview:lUILabel];
            [lUILabel setTag:tagCount];
            RELEASE_NIL(lUILabel);
//      }
        UIImageView *lUIImageView = [[UIImageView alloc]init];
            lUIImageView.frame = CGRectMake(lXCoord+100, lYCoord, 45, 29);
       [lImageView_ setHighlightedImage:[UIImage imageNamed:[NSString stringWithFormat:@"iPad_BuildInspectionDetails_%@_Selected.png",[[mDamageTableArray_ objectAtIndex:0] objectAtIndex:indexPath.row]]]];
      [lImageView_ setImage:[UIImage imageNamed:[NSString stringWithFormat:@"iPad_BuildInspectionDetails_%@_Normal.png",[[mDamageTableArray_ objectAtIndex:0] objectAtIndex:indexPath.row]]]];
        cell.accessoryView=lUIImageView;
        [lUIImageView setTag:tagCount + 1];
        RELEASE_NIL(lUIImageView);
        UIView *lSelectedView_ = [[[UIView alloc] init] autorelease];
        lSelectedView_.backgroundColor =SELECTED_CELL_COLOR_GM;
        cell.selectedBackgroundView = lSelectedView_;
    }
    //cell.accessoryType=UITableViewCellAccessoryNone;
    return cell;
}
 - Note :-
 Use setHighlightedImage property for UIImageView `enter code here`& highlightedTextColor for UILabel.
 you can see highlighted image and highlighted text color if you select a row in UITableView
This will help you.
Happy Coding...`