IOS中忽略字符串两边空格比较

• -(Bool) compareStr:(NSString *) str ：(NSString *) str1 { 
•  
•    
• //A character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085). 
•         NSCharacterSet *set = [NSCharacterSet whitespaceAndNewlineCharacterSet]; 
•        
• //Returns a new string made by removing from both ends of the receiver characters contained in a given character set. 
•         NSString *trimedString = [str stringByTrimmingCharactersInSet:set]; 
  •  NSString *trimedString 1= [str1 stringByTrimmingCharactersInSet:set];
•         if([trimedString isEqualToString:trimedString1])
•       {
•             return YES;
•       }
•       else
•       {
•             return NO;
•       }
•    }
•