我正在访问 iPhone 上的地址簿并将电话号码存储在一个名为 numberValues 的 NSString 对象中。最初，这些电话号码被大量额外的垃圾包围，例如引号、加号、括号、空格等。所以我设置了所有这些 rangeOfString 和 stringByReplacingOccurencesOf 方法调用以删除所有额外代码。
删除所有多余的垃圾后，我只剩下 10 位电话号码，仅此而已。因此，如果联系人有 1 个电话号码，那么我的 numberValues 对象的长度属性应该为 10。如果联系人有 2 个电话号码，那么我的 numberValues 对象的长度属性应该为 20。
这就是奇怪的地方。当我在一个电话号码的联系人上使用 NSLog numberValues.length 时，它会将长度 12 打印到控制台。如果我对具有两个电话号码的联系人执行相同的操作，它会向控制台打印长度为 23 的数据。
我不明白为什么当我花时间删除所有多余的垃圾(包括空格)并且当我 NSLog numberValues 对象时，length 属性打印出一个臃肿的数字，您可以在日志中清楚地看到它包含 10 位电话号码，仅此而已。
这是当我执行 NSLog(@"%@", numberValues) 时如何将具有 1 个电话号码的联系人打印到日志中的方式:
2014-01-19 10:36:54.912 PhotoTest1[2658:60b]
9495553119
请记住，当我执行 NSLog(@"%d", numberValues.length) 时，它会打印出 12。
下面是当我执行 NSLog(@"%@", numberValues) 时，一个有 2 个电话号码的联系人如何打印到日志中:
014-01-19 10:36:54.737 PhotoTest1[2658:60b]
7142973557
7149557735
请记住，当我执行 NSLog(@"%d", numberValues.length) 时，它会打印出 23。
知道为什么 length 属性比它们应该的长吗？
感谢您的帮助。
编辑:这是我的所有代码，在我成功获得对用户地址簿的访问权之后开始，然后一直到我开始访问 numberValues 对象的 length 属性的地方:
int z = allContacts.count - 1;
for (int i = 0; i < z; i++)
{
NSArray *allContacts = (__bridge_transfer NSArray
*)ABAddressBookCopyArrayOfAllPeople(m_addressbook);
ABRecordRef contactPerson = (__bridge ABRecordRef)allContacts[i];
NSString *firstName = (__bridge_transfer NSString
*)ABRecordCopyValue(contactPerson, kABPersonFirstNameProperty);
ABMultiValueRef *phoneNumber = ABRecordCopyValue(contactPerson, kABPersonPhoneProperty);
NSMutableArray *numbers = [NSMutableArray array];
//NSLog(@"The count: %ld", ABMultiValueGetCount(phoneNumber));
NSString *number = (__bridge_transfer NSString*)ABMultiValueCopyArrayOfAllValues(phoneNumber);
[numbers addObject:number];
NSString *numberValues = [[NSString alloc]initWithFormat:@"%@", number];
NSLog(@"Here are the numbers for the contact named %@: %@", firstName, numberValues);
if([numberValues rangeOfString:@"+"].location == NSNotFound) {
NSLog(@"Phone Number does not contain a plus sign.");
} else {
numberValues = [numberValues stringByReplacingOccurrencesOfString:@"+1" withString:@""];
NSLog(@"This new number value should not have a + anymore: %@", numberValues);
}
if([numberValues rangeOfString:@" ("].location == NSNotFound) {
NSLog(@"No phone numbers contain blank space with start of parentheses");
} else {
NSLog(@"Phone number(s) do contain blank space with start of parentheses");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@" (" withString:@""];
NSLog(@"The new number values should not contain a blank space with the start of parentheses: %@", numberValues);
}
if([numberValues rangeOfString:@") "].location == NSNotFound) {
NSLog(@"Phone number(s) do not contain ) and a blank space");
} else {
NSLog(@"Phone numbers do contain ) and a blank space");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@") " withString:@""];
NSLog(@"These new phone number values should not have ) with a blank space after it: %@", numberValues);
}
if([numberValues rangeOfString:@"-"].location == NSNotFound) {
NSLog(@"No numbers contain a dash");
} else {
NSLog(@"Number(s) does contain a dash");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@"-" withString:@""];
NSLog(@"The new number values should not have any dashes: %@", numberValues);
}
if([numberValues rangeOfString:@"("].location == NSNotFound) {
NSLog(@"Number(s) do not contain a (");
} else {
NSLog(@"Number(s) contains a (");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@"(" withString:@""];
NSLog(@"The new number(s) should not have any ( in them: %@", numberValues);
}
if ([numberValues rangeOfString:@"\""].location == NSNotFound) {
NSLog(@"Number does not contain any quotations");
} else {
NSLog(@"Number(s) do contain quotations");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@"\"" withString:@""];
NSLog(@"Numbers should not have any quotations: %@", numberValues);
}
if([numberValues rangeOfString:@")"].location == NSNotFound) {
NSLog(@"The final ) has been deleted");
} else {
NSLog(@"Need to delete the final )");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@")" withString:@""];
NSLog(@"Final value(s) should not have a trailing ) at the end: %@", numberValues);
}
if([numberValues rangeOfString:@","].location == NSNotFound) {
NSLog(@"The final , has been deleted");
} else {
NSLog(@"Need to delete the final ,");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@"," withString:@""];
NSLog(@"%@", numberValues);
NSLog(@"Final value(s) should not have a trailing , at the end: %lu", (unsigned long)numberValues.length);
}
if([numberValues rangeOfString:@" "].location == NSNotFound) {
NSLog(@"No blank spaces.");
} else {
NSLog(@"There are blank spaces that need to be deleted");
numberValues = [numberValues stringByReplacingOccurrencesOfString:@" " withString:@""];
NSLog(@"%@", numberValues);
}
NSLog(@"RIGHT BEFORE THE NEW IF STATEMENT");
NSLog(@"%d", numberValues.length);
if(numberValues.length < 11) {
NSLog(@"RUNNING PFQUERY");
PFQuery *query = [PFQuery queryWithClassName:@"_User"];
[query whereKey:@"username" equalTo:numberValues];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(@"Here are the objects that have been returned from Parse: %@", objects);
} else {
NSLog(@"CHARACTERS: %d", numberValues.length);
int howManyNumbers = numberValues.length / 10;
NSLog(@"%d", howManyNumbers);
}
针对 Veddermatic 的评论编辑 2:
我刚刚做了 NSLog(@"###%@###", numberValues); 这是它打印到日志的方式:
2014-01-19 11:06:00.529 PhotoTest1[2678:60b] ###
3097679973
###
最佳答案
长度正确，还有更多的字符没有被剥离。 NSString 支持超过一百万个字符，您无法检查所有字符。
相反，您应该使用 RegEx 删除所有非数字的内容。
NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"[^0-9]" options:0 error:nil];
NSString *phoneNumber = [regex stringByReplacingMatchesInString:phoneNumber options:0 range:NSMakeRange(0, phoneNumber.length) withTemplate:@""];
关于ios - NSString 对象的 length 属性有一个不正确的值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/21221131/