How to remove whitespace in a string?

Question

I have a string say \"Allentown, pa\"

How to remove the white space in between , and pa using objective c?

Answer 1

Here is a proper and documented way of removing white spaces from your string.

whitespaceCharacterSet Apple Documentation for iOS says:

Returns a character set containing only the in-line whitespace characters space (U+0020) and tab (U+0009).

+ (id)whitespaceCharacterSet
Return Value
A character set containing only the in-line whitespace characters space (U+0020) and tab (U+0009).

Discussion
This set doesn’t contain the newline or carriage return characters.

Availability
Available in iOS 2.0 and later.

You can use this documented way:

[yourString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

Hope this helps you.

If you need any more help then please let me know on this.

Answer 2

If you want to white-space and new-line character as well then use "whitespaceAndNewlineCharacterSet" instead of "whitespaceCharacterSet"

 NSCharacterSet *whitespace = [NSCharacterSet whitespaceCharacterSet];
 NSString *trimmedString = [temp.text stringByTrimmingCharactersInSet:whitespace];

 NSLog(@"Value of the text field is %@",trimmedString);   

Answer 3

NSString *sample = @" string with whitespaces";
NSString *escapeWhiteSpaces = [sample stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

Answer 4

Here is the proper way to remove extra whitespaces from string which is coming in between.

NSString *yourString = @"Allentown,   pa";
NSCharacterSet *whitespaces = [NSCharacterSet whitespaceCharacterSet];
NSPredicate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];

NSArray *parts = [yourString componentsSeparatedByCharactersInSet:whitespaces];
NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];
yourString = [filteredArray componentsJoinedByString:@" "];

Answer 5

Hi there is the swift version of the solution with extension :

extension String{
    func deleteSpaces() -> String{
        return self.stringByReplacingOccurrencesOfString(" ", withString: "")
    }
}

And Just call

(yourString as! String).deleteSpaces()

Answer 6

- (NSString *)removeWhitespaces {
  return [[self componentsSeparatedByCharactersInSet:
                    [NSCharacterSet whitespaceCharacterSet]]
      componentsJoinedByString:@""];
}