在 iOS 中检测井号标签 #、提及标签 @，就像在 Twitter 应用程序中一样

我需要检测#Tags描述中给出UILabel并将文本颜色更改为[UIColor BlueColor];我无法更改其中的特定文本颜色UILabel到蓝色。现在我正在使用这个UILabel在定制中UITableViewCell。有什么办法可以解决这个问题来区分#Tags和普通文本的文本颜色？有人可以帮我解决这个问题吗？

-(NSMutableAttributedString*)decorateTags:(NSString *)stringWithTags{


    NSError *error = nil;

    //For "Vijay #Apple Dev"
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"#(\\w+)" options:0 error:&error];

    //For "Vijay @Apple Dev"
    //NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"@(\\w+)" options:0 error:&error];

    NSArray *matches = [regex matchesInString:stringWithTags options:0 range:NSMakeRange(0, stringWithTags.length)];
    NSMutableAttributedString *attString=[[NSMutableAttributedString alloc] initWithString:stringWithTags];

    NSInteger stringLength=[stringWithTags length];

    for (NSTextCheckingResult *match in matches) {

        NSRange wordRange = [match rangeAtIndex:1];

        NSString* word = [stringWithTags substringWithRange:wordRange];

        //Set Font
        UIFont *font=[UIFont fontWithName:@"Helvetica-Bold" size:15.0f];
        [attString addAttribute:NSFontAttributeName value:font range:NSMakeRange(0, stringLength)];


        //Set Background Color
        UIColor *backgroundColor=[UIColor orangeColor];
        [attString addAttribute:NSBackgroundColorAttributeName value:backgroundColor range:wordRange];

        //Set Foreground Color
        UIColor *foregroundColor=[UIColor blueColor];
        [attString addAttribute:NSForegroundColorAttributeName value:foregroundColor range:wordRange];

        NSLog(@"Found tag %@", word);

    }

    // Set up your text field or label to show up the result

    //    yourTextField.attributedText = attString;
    //
    //    yourLabel.attributedText = attString;

    return attString;
}