stringByReplacingOccurrencesOfString 不适用于 space，即 objective c 中的“”

Question

- (void)contactPicker:(CNContactPickerViewController *)picker didSelectContactProperty:(CNContactProperty *)contactProperty;

{
    [self dismissViewControllerAnimated:YES completion: nil];
    CNLabeledValue *phoneNumberValue = contactProperty.value;
    NSString *contactString = [phoneNumberValue valueForKey:@"_stringValue"];

    contactString = [contactString stringByReplacingOccurrencesOfString:@"-" withString:@""];
    contactString = [contactString stringByReplacingOccurrencesOfString:@" " withString:@""]; // This line of code is not working properly
    contactString = [contactString stringByReplacingOccurrencesOfString:@"(" withString:@""];
    contactString = [contactString stringByReplacingOccurrencesOfString:@")" withString:@""];
    txtRecipient.text = contactString;
}

这是我的代码。我正在使用 contactPicker 从电话簿中选择联系人。然后我将它存储到一个字符串变量中。之后，我使用 stringByReplacingOccurrencesOfString 从字符串值中删除破折号、括号和空格。除这一行外，一切正常：

contactString = [contactString stringByReplacingOccurrencesOfString:@" " withString:@""];

在这行代码之后，contactString 保持不变，即没有从字符串中删除空格。我也试过 componentsSeparatedByString 函数，但它只返回 1 个字符。即，

NSArray *components = [dateString componentsSeparatedByString:@" "];

components.length 返回 1。

希望你能理解我的问题。还有其他方法可以从字符串中删除空格吗？任何形式的帮助都将不胜感激。谢谢。

Answer 1

这看起来不标准space。试试这个：

  NSMutableCharacterSet* set = [NSMutableCharacterSet whitespaceCharacterSet];
  [set addCharactersInString:@"()-"];
  NSMutableString * contactString = [[phoneNumberValue valueForKey:@"_stringValue"] mutableCopy];
  NSRange range;
  while ((range = [contactString rangeOfCharacterFromSet:set]).location!=NSNotFound) {
    [contactString deleteCharactersInRange:range];
  }

stringByReplacingOccurrencesOfString 不适用于 space，即 objective c 中的“”

stringByReplacingOccurrencesOfString is not working for space i.e, " " in objective c

objective-c

nsstring

ios