[objective-c] Remove all whitespaces from NSString

I've been trying to get rid of the white spaces in an NSString, but none of the methods I've tried worked.

I have "this is a test" and I want to get "thisisatest".

I've used whitespaceCharacterSet, which is supposed to eliminate the white spaces.

NSString *search = [searchbar.text stringByTrimmingCharactersInSet:
                           [NSCharacterSet whitespaceCharacterSet]];

but I kept getting the same string with spaces. Any ideas?

stringByReplacingOccurrencesOfString will replace all white space with in the string non only the starting and end

Use

[YourString stringByTrimmingCharactersInSet:[NSCharacterSet  whitespaceAndNewlineCharacterSet]]

Use below marco and remove the space.

#define TRIMWHITESPACE(string) [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]]

in other file call TRIM :

    NSString *strEmail;
    strEmail = TRIM(@"     this is the test.");

May it will help you...

Easy task using stringByReplacingOccurrencesOfString

NSString *search = [searchbar.text stringByReplacingOccurrencesOfString:@" " withString:@""];

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

pStrTemp = [pStrTemp stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

I prefer using regex like this:

NSString *myString = @"this is a test";
NSString *myNewString = [myString stringByReplacingOccurrencesOfString:@"\\s"
                                     withString:@""
                                        options:NSRegularExpressionSearch
                                          range:NSMakeRange(0, [myStringlength])];
 //myNewString will be @"thisisatest"

You can make yourself a category on NSString to make life even easier:

- (NSString *) removeAllWhitespace
{
    return [self stringByReplacingOccurrencesOfString:@"\\s" withString:@""
                                              options:NSRegularExpressionSearch
                                                range:NSMakeRange(0, [self length])];

}

Here is a unit test method on it too:

- (void) testRemoveAllWhitespace
{
    NSString *testResult = nil;

    NSArray *testStringsArray        = @[@""
                                         ,@"    "
                                         ,@"  basicTest    "
                                         ,@"  another Test \n"
                                         ,@"a b c d e f g"
                                         ,@"\n\tA\t\t \t \nB    \f  C \t  ,d,\ve   F\r\r\r"
                                         ,@"  landscape, portrait,     ,,,up_side-down   ;asdf;  lkjfasdf0qi4jr0213 ua;;;;af!@@##$$ %^^ & *  * ()+  +   "
                                         ];

    NSArray *expectedResultsArray   = @[@""
                                        ,@""
                                        ,@"basicTest"
                                        ,@"anotherTest"
                                        ,@"abcdefg"
                                        ,@"ABC,d,eF"
                                        ,@"landscape,portrait,,,,up_side-down;asdf;lkjfasdf0qi4jr0213ua;;;;af!@@##$$%^^&**()++"
                                        ];

    for (int i=0; i < [testStringsArray count]; i++)
    {
        testResult = [testStringsArray[i] removeAllWhitespace];
        STAssertTrue([testResult isEqualToString:expectedResultsArray[i]], @"Expected: \"%@\" to become: \"%@\", but result was \"%@\"",
                     testStringsArray[i], expectedResultsArray[i], testResult);
    }
}

This for me is the best way SWIFT

        let myString = "  ciao   \n              ciao     "
        var finalString = myString as NSString

        for character in myString{
        if character == " "{

            finalString = finalString.stringByReplacingOccurrencesOfString(" ", withString: "")

        }else{
            finalString = finalString.stringByReplacingOccurrencesOfString("\n", withString: "")

        }

    }
     println(finalString)

and the result is : ciaociao

But the trick is this!

 extension String {

    var NoWhiteSpace : String {

    var miaStringa = self as NSString

    if miaStringa.containsString(" "){

      miaStringa =  miaStringa.stringByReplacingOccurrencesOfString(" ", withString: "")
    }
        return miaStringa as String

    }
}

let myString = "Ciao   Ciao       Ciao".NoWhiteSpace  //CiaoCiaoCiao

That is for removing any space that is when you getting text from any text field but if you want to remove space between string you can use

xyz =[xyz.text stringByReplacingOccurrencesOfString:@" " withString:@""];

It will replace empty space with no space and empty field is taken care of by below method:

searchbar.text=[searchbar.text stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceCharacterSet]];

I strongly suggest placing this somewhere in your project:

extension String {
    func trim() -> String {
        return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
    }

    func trim(withSet: NSCharacterSet) -> String {
        return self.stringByTrimmingCharactersInSet(withSet)
    }
}

This may help you if you are experiencing \u00a0 in stead of (whitespace). I had this problem when I was trying to extract Device Contact Phone Numbers. I needed to modify the phoneNumber string so it has no whitespace in it.

NSString* yourString = [yourString stringByReplacingOccurrencesOfString:@"\u00a0" withString:@""];

When yourString was the current phone number.