检索关键字并替换全部

/// 只要包含有搜索关键字都要高亮
- (void)searchKeyHighlight:(NSString *)key {
    NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:_contenL.text];
    NSMutableAttributedString *attriKey = [[NSMutableAttributedString alloc] initWithString:key attributes:@{NSForegroundColorAttributeName: cc_green}];
    // 法1
//    NSArray <NSString *>*arr = [str.string componentsSeparatedByString:key];
//    NSInteger i = 0;
//    NSRange range;
//    while (i<arr.count-1) {
//        if (i>0) {
//            range = NSMakeRange(range.location + key.length + arr[i].length, key.length);
//        } else {
//            range = NSMakeRange(arr[i].length, key.length);
//        }
//        [str replaceCharactersInRange:range withAttributedString:attriKey];
//        i++;
//    }
//    _contenL.attributedText = str;
    
    // 法2
    [str.string enumerateRegexMatches:key options:NSRegularExpressionCaseInsensitive usingBlock:^(NSString * _Nonnull match, NSRange matchRange, BOOL * _Nonnull stop) {
        [str replaceCharactersInRange:matchRange withAttributedString:attriKey];
    }];
    _contenL.attributedText = str;
}