Question

在我的tableview单元格中，有一个Description标签。描述文本将通过Attributed Text以单独的方法突出显示。这种方法是来自cellforRowIndexPath＆amp;这就是为什么tableview卷轴落后很多。

我的代码

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
SearchVCCell *cell = (SearchVCCell *)[tableView dequeueReusableCellWithIdentifier:cellidentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"SearchVCCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];

    cell.lbl_title.text=[NSString stringWithFormat:@"%@",[arrTitle objectAtIndex:indexPath.row]];
    cell.lbl_disc.text=[NSString stringWithFormat:@"%@",[arrDescription objectAtIndex:indexPath.row]];
    cell.lbl_page.text=[NSString stringWithFormat:@"Page: %d",[[arrPageNumber objectAtIndex:indexPath.row]intValue]];


   int p= [self highlightText:_search_bar.text :cell.lbl_disc];   //Method Call
    cell.lbl_count.text=[NSString stringWithFormat:@"%d",p];
    }
    return cell;
}

HightText方法：

-(int) highlightText :(NSString *)srcTxt :(UILabel*)txtView {
    int srcTxtLen = srcTxt.length;
    int idx = 0,count=0;
    while (idx<(txtView.text.length-srcTxtLen)) {
        NSRange srcRange = NSMakeRange(idx, srcTxtLen);
        if ([[txtView.text substringWithRange:srcRange] isEqualToString:srcTxt]) {
            NSMutableAttributedString *tmpAttrTxt = [[NSMutableAttributedString alloc] initWithAttributedString:txtView.attributedText];
            [tmpAttrTxt addAttribute:NSBackgroundColorAttributeName value:[UIColor yellowColor] range:srcRange];
            txtView.attributedText = tmpAttrTxt;
            idx += srcTxtLen;
            count++;
        } else {
            idx++;
        }
    }
    return count;
}

帮助我解决，提前致谢

Answer 1

您可以使用此

替换您的方法调用

NSMutableAttributedString * string = [[NSMutableAttributedString alloc]initWithString:cell.lbl_disc.text];
NSRange range=[cell.lbl_disc.text rangeOfString:_search_bar.text];
[string addAttribute:NSForegroundColorAttributeName value:[UIColor yellowColor] range:range];
[self.textToSpeak setAttributedText:string];

Answer 2

使用此方法：

- (NSMutableAttributedString*) setColor:(UIColor*)color forWord:(NSString*)word inText:(NSMutableAttributedString*)string {

    NSUInteger count = 0, length = [string length];
    NSRange range = NSMakeRange(0, length);

    while(range.location != NSNotFound)
    {
        range = [[string string] rangeOfString:word options:0 range:range];
        if(range.location != NSNotFound) {
            [string setTextColor:color range:NSMakeRange(range.location, [word length])];
            range = NSMakeRange(range.location + range.length, length - (range.location + range.length));
            count++;
        }
    }

    return string;
}

并在您的tableview单元格中调用此

cell.lbl_disc.text=    [self setColor:[UIColor yellowColor] forWord:_search_bar.text inText:[[NSMutableAttributedString alloc] initWithAttributedString:[NSString stringWithFormat:@"%@",[arrDescription objectAtIndex:indexPath.row]]]];

由于Method调用，Tableview滚动速度减慢

2 个答案: