NSDataDetector检测"电话号码"文本

Question

我能解释这个问题最简单的方法是使用代码示例及其输出,但实质上发生的NSDataDetector是检测字符串中包含"电话号码"字样的电话号码.

NSError *error = nil;
NSDataDetector *dataDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber
                                                               error:&error];

NSArray *stringsToTest = @[
                           @"testing phone number 0123 4567891",
                           @"testing some other number 0123 4567892",
                           @"phone number 0123 4567893",
                           @"blah blah 0123 4567894",
                           @"testing telephone number 0123 4567895"
                           ];

for (NSString *string in stringsToTest)
{
    [dataDetector enumerateMatchesInString:string
                                   options:0
                                     range:NSMakeRange(0, string.length)
                                usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
                                    NSLog(@"%@", result.phoneNumber);
                                }];
}

输出:

2013-11-24 19:04:26.000 PhoneNumberDetector[21874:70b] phone number 0123 4567891
2013-11-24 19:04:26.000 PhoneNumberDetector[21874:70b] 0123 4567892
2013-11-24 19:04:26.000 PhoneNumberDetector[21874:70b] phone number 0123 4567893
2013-11-24 19:04:26.000 PhoneNumberDetector[21874:70b] 0123 4567894
2013-11-24 19:04:26.001 PhoneNumberDetector[21874:70b] 0123 4567895

我已阅读文档并在SO周围搜索,但找不到任何表明这是否是预期行为的内容,如果是,为什么.

这发生在7.0模拟器以及运行7.0.4的iPhone 5s上.

如果有人能对这个问题有所了解,我会非常感激.

更新: 为了澄清,我不希望文本"电话号码"成为访问该NSTextCheckingResult phoneNumber属性时结果的一部分.

Answer 1

虽然这似乎是 Apple 代码中的一个错误，但如果您想通过消除块中的非数字字符来仅从字符串中提取数字，则有一个简单的解决方法：

NSError *error = nil;
    NSDataDetector *dataDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber
                                                                   error:&error];

    NSArray *stringsToTest = @[
                                @"testing phone number 0123 4567891",
                                @"testing some other number 0123 4567892",
                                @"phone number 0123 4567893",
                                @"blah blah 0123 4567894",
                                @"testing telephone number 0123 4567895",
                                @"phone",
                                @"number",
                                @"my phone number 1234587985",
                                @"this string does not contain a phone number"
                               ];

    for (NSString *string in stringsToTest)
    {
        [dataDetector enumerateMatchesInString:string
                                       options:0
                                         range:NSMakeRange(0, string.length)
                                    usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) 
                                    {
                                        NSString *numberWithExtra = result.phoneNumber;
                                        NSCharacterSet *toRemove = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
                                        NSString *trimmed = [[numberWithExtra componentsSeparatedByCharactersInSet:toRemove] componentsJoinedByString:@""];
                                        if(trimmed && trimmed.length)
                                        {
                                            NSLog(@"%@", trimmed);
                                        }
                                        else
                                        {
                                            NSLog(@"No phone number");
                                        }
                                    }];
    }