NSDataDetector与NSTextCheckingTypeLink检测URL和PhoneNumbers！ [英] NSDataDetector with NSTextCheckingTypeLink detects URL and PhoneNumbers!

问题描述

我想从一个简单的NSString句子中获取一个URL。为此，我在下面的代码中使用NSDataDetector：

I am trying to get an URL from a simple NSString sentence. For that I use NSDataDetector in the following code:

NSString *string = @"This is a sample of a http://abc.com/efg.php?EFAei687e3EsA sentence with a URL within it and a number 097843."; 
NSDataDetector *linkDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil]; 
NSArray *matches = [linkDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])];

for (NSTextCheckingResult *match in matches) {

  if ([match resultType] == NSTextCheckingTypeLink) {
    NSString *matchingString = [match description];
    NSLog(@"found URL: %@", matchingString);
  }
}

结果是它找到URL和数字。该号码被检测为电话号码：

The result is that it finds the URL and the number. The number is detected as a phone-Number:

found URL: http://abc.com/efg.php?EFAei687e3EsA
found URL: tel:097843

这是一个错误？

推荐答案

NSDataDetector 必须将电话号码检测为链接，因为在电话上，您可以点按它们，如同他们是一个链接，以发起电话呼叫（或点击并按住以启动短信等）。我相信当前语言环境（即 NSLocale ）是什么决定一个数字字符串是否看起来像一个电话号码。例如，在美国，至少需要七位数字才能被识别为电话号码，因为美国的数字是一般形式： \d {3} -\d {4} 。

NSDataDetector necessarily detects telephone numbers as links because on the phone, you can tap them as if they were a link in order to initiate a phone call (or tap and hold to initiate a text message, etc). I believe that the current locale (ie, NSLocale) is what determines whether a string of numbers looks like a phone number or not. For example, in the United States, it would take at least seven digits to be recognized as a phone number, since numbers in the US are of the general form: \d{3}-\d{4}.

对于识别电话链接与另一个链接，检查 http：// 。一个简单的例子足够了：如果它是一个 https：// 链接？

As for recognizing a telephone link versus another link, it's not a good idea to check for http:// at the beginning of the URL. A simple example suffices: what if it's an https:// link? Then your code breaks.

更好的检查方法是：

NSArray *matches = [linkDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])];

for (NSTextCheckingResult *match in matches) {
  NSURL *url = [match URL];
  if ([[url scheme] isEqual:@"tel"]) {
    NSLog(@"found telephone url: %@", url);
  } else {
    NSLog(@"found regular url: %@", url);
  }
}

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