关于字符串遍历

NSDataDetector * _detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];

NSArray *_urlMatches = [_detector matchesInString:self.model.content options:0 range:NSMakeRange(0, self.model.content.length)];

for (NSTextCheckingResult *match in _urlMatches) {

if ([match resultType] == NSTextCheckingTypeLink) {

NSRange matchRange = [match range];

if ([self isIndex:index inRange:matchRange]) {

[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor grayColor] range:matchRange];

}

else {

[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor blueColor] range:matchRange];

}

[attributedString addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:matchRange];

}

}