How to remove whitespace in a string?

I have a string say "Allentown, pa"

How to remove the white space in between , and 开发者_JS百科pa using objective c?

This will remove all space from myString.

NSString *newString = [myString stringByReplacingOccurrencesOfString:@" " withString:@""];

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.

Probably the solution in one of the answers in Collapse sequences of white space into a single character and trim string:

NSString *whitespaceString = @" String with whitespaces ";

NSString *trimmedString = [whitespaceString stringByReplacingOccurrencesOfString:@" " withString:@""];

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);   

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

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

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

In my case NSString was added Zero Width Space(i i used some library). so solution worked for me.

NSMutableString *newString=[[newString stringByReplacingOccurrencesOfString:@"\u200B" withString:@""] mutableCopy];

@"\u200B" is Zero width space character value.

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:@" "];

you can use remove function to remove any substring from the string

- (NSString*)remove:(NSString*)textToRemove fromString:(NSString*)input { 
    return [input stringByReplacingOccurrencesOfString:textToRemove withString:@""]; 
}

I have tried all the solutions here, none of them could remove the whitespace generated by the Chinese PinYin Input method.

After some debugging, I found this working:

NSString *newString = [myString stringByReplacingOccurrencesOfString:@"\342\200\206" withString:@""];

I have googled what the '\342\200\206' is, but failed.

Whatever, it works for me.

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()

Swift 3:

var word: String = "Hello world"
let removeWhiteSpace = word.stringByRemovingWhitespaces
word = "Helloworld"