iOS 字符串前后插入图片，指定字符后插入图片

一、字符串前（后）插入图片

标题头插入图片.jpg

    //  利用 `NSTextAttachment` 生成图片再转化为可变字符串
    NSTextAttachment *attch = [[NSTextAttachment alloc] init];
    attch.image = [UIImage imageNamed:@"allresponse_title"];
    attch.bounds = CGRectMake(0, 0, attch.image.size.width, attch.image.size.height);
    NSMutableAttributedString *result = [[NSMutableAttributedString alloc] initWithString:[NSString stringWithFormat:@" %@",channelModel.title]];
    NSAttributedString *b_string = [NSAttributedString attributedStringWithAttachment:attch];
    [result insertAttributedString:b_string atIndex:0];
    self.titleLabel.attributedText = result;

二、关键字命中字符串显示高亮并插入图片

指定字符后插入图片.png

// 关键词高亮显示

- (void)setHighLightWordWithModel:(WEShareholderModel *)model {
    // 插入多个关键字
    if ([self.correlationCompanyArr isKindOfClass:[NSArray class]] && self.correlationCompanyArr.count > 0) {
        NSMutableArray *tempArray = [[NSMutableArray alloc] init];
        NSMutableArray *highWordArray = [[NSMutableArray alloc] init];
        // 1. 寻找关键词位置
        for (WECompanyModel *mm in self.correlationCompanyArr) {
            NSString *highword = mm.name;
            if ([mm.keywords isKindOfClass:[NSString class]] && [mm.keywords isNoEmpty]) {
                highword = mm.keywords;
            }
            [highWordArray addObject:highword];
            if ([highword isKindOfClass:[NSString class]] && [model.content containsString:highword]) {
                NSMutableAttributedString *title = [[NSMutableAttributedString alloc]initWithString:model.content];
                NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:highword options:0 error:nil];
                NSArray *matches = [regex matchesInString:model.content options:0 range:NSMakeRange(0, model.content.length)];
                // 只显示一次
                if ([matches isKindOfClass:[NSArray class]] && matches.count > 0) {
                    matches = [matches subarrayWithRange:NSMakeRange(0, 1)];
                }
                for(NSTextCheckingResult *result in [matches objectEnumerator]){
                    NSRange matchRange = [result range];
                    [tempArray addObject:[NSValue valueWithRange:matchRange]];
                }
            }
        }
        if (tempArray.count == 0) { // 无匹配企业
            NSMutableAttributedString *attrText = [[NSMutableAttributedString alloc] initWithString:model.content];
            [attrText addAttribute:NSFontAttributeName value:kFontPingFangRegular(19) range:NSMakeRange(0, attrText.string.length)];
            if (self.keyword) { // 有关键词，匹配关键词高亮
                NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:self.keyword options:0 error:nil];
                NSArray *matches = [regex matchesInString:model.content options:0 range:NSMakeRange(0, model.content.length)];
                for(NSTextCheckingResult *result in [matches objectEnumerator]){
                    NSRange matchRange = [result range];
                    [attrText setColor:kAssistNewColor range:matchRange];
                }
            }
            self.detailLabel.attributedText = attrText;
        } else {
            // 2.根据关键词位置，插入图片
            int i = 0;
            NSMutableAttributedString *title = [[NSMutableAttributedString alloc]initWithString:model.content];
            [title addAttribute:NSFontAttributeName value:kFontPingFangRegular(19) range:NSMakeRange(0, title.string.length)];
            NSArray *sortArray = [tempArray sortedArrayUsingComparator:^NSComparisonResult(id _Nonnull obj1, id _Nonnull obj2) {
                if ([obj1 isKindOfClass:[NSValue class]] && [obj2 isKindOfClass:[NSValue class]]) {
                    NSValue *value1 = obj1;
                    NSValue *value2 = obj2;
                    NSRange range1 = [value1 rangeValue];
                    NSRange range2 = [value2 rangeValue];
                    return (range1.location < range2.location ? NSOrderedDescending : NSOrderedAscending);
                }
                return NSOrderedAscending;
            }];
            // 2.1从后往前插入，就不会影响前面获取的位置坐标
            for (NSValue *value in sortArray) {
                NSRange range = [value rangeValue];
                NSTextAttachment *attachment = [[NSTextAttachment alloc] init];
                attachment.image = [UIImage imageNamed:@"icon-company"];
                attachment.bounds = CGRectMake(2, 0, 17.5, 15);
                NSAttributedString *imageAttachment = [NSAttributedString attachmentStringWithContent:attachment.image contentMode:UIViewContentModeScaleAspectFit attachmentSize:attachment.bounds.size alignToFont:title.font alignment:YYTextVerticalAlignmentTop];
                [title insertAttributedString:imageAttachment atIndex:range.location+range.length];
                i++;
            }
            // 3.全部完成后，给关键词高亮，添加点击事件 （如果在之前设置高亮，位置会偏移）
            for (WECompanyModel *mm in self.correlationCompanyArr) {
                NSString *highword = mm.name;
                if ([mm.keywords isKindOfClass:[NSString class]] && [mm.keywords isNoEmpty]) {
                    highword = mm.keywords;
                }
                if ([highword isKindOfClass:[NSString class]] && [title.string containsString:highword]) {
                    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:highword options:0 error:nil];
                    NSArray *matches = [regex matchesInString:title.string options:0 range:NSMakeRange(0, title.string.length)];
                    if ([matches isKindOfClass:[NSArray class]] && matches.count > 0) {
                        matches = [matches subarrayWithRange:NSMakeRange(0, 1)];
                    }
                    for(NSTextCheckingResult *result in [matches objectEnumerator]){
                        NSRange matchRange = [result range];
                        [title setTextHighlightRange:matchRange color:kAssistSubColor backgroundColor:[UIColor clearColor] tapAction:^(UIView * _Nonnull containerView, NSAttributedString * _Nonnull text, NSRange range, CGRect rect) {
                            [self companyBtnOnClickWithModel:mm];
                        }];
                    }
                }
                if (self.keyword) { // 有关键词，匹配关键词高亮
                    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:self.keyword options:0 error:nil];
                    NSArray *matches = [regex matchesInString:title.string options:0 range:NSMakeRange(0, title.string.length)];
                    for(NSTextCheckingResult *result in [matches objectEnumerator]){
                        NSRange matchRange = [result range];
                        [title setColor:kAssistNewColor range:matchRange];
                    }
                }
            }
            self.detailLabel.attributedText = title;
        }
        
    } else {
        NSMutableAttributedString *attrText = [[NSMutableAttributedString alloc] initWithString:model.content];
        [attrText addAttribute:NSFontAttributeName value:kFontPingFangRegular(19) range:NSMakeRange(0, attrText.string.length)];
        if (self.keyword) { // 有关键词，匹配关键词高亮
            NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:self.keyword options:0 error:nil];
            NSArray *matches = [regex matchesInString:model.content options:0 range:NSMakeRange(0, model.content.length)];
            for(NSTextCheckingResult *result in [matches objectEnumerator]){
                NSRange matchRange = [result range];
                [attrText setColor:kAssistNewColor range:matchRange];
            }
        }
        self.detailLabel.attributedText = attrText;
    }
}