iOS之文本中所有指定关键字改变颜色

开发中会遇到一段文字中所有指定关键字改变颜色的需求，直接上代码：

- (NSAttributedString *)matchingWithKeyword:(NSString *)keyword inResultString:(NSString *)resultSting color:(UIColor *)color{
    // 创建富文本
    NSMutableAttributedString *newString = [[NSMutableAttributedString alloc] initWithString:resultSting];
    
    // 正则检索
    NSRegularExpression *regex = [[NSRegularExpression alloc]initWithPattern:keyword options:NSRegularExpressionCaseInsensitive error:nil];
    [regex enumerateMatchesInString:resultSting options:NSMatchingReportProgress range:NSMakeRange(0, resultSting.length) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
        
        [newString addAttribute:(NSString*)NSForegroundColorAttributeName
                          value:color
                          range:result.range];
    }];
    return newString;
}

效果图