NSString *string = @" spaces in front and at the end ";
NSString *trimmedString = [string stringByTrimmingCharactersInSet:
                                  [NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(trimmedString)

http://www.cocoanetics.com/2009/01/remove-whitespace-from-nsstring/

removing whitespace from front and end of a string

Removing whitespace from NSString

Objective C