字符串去掉空格

- (void)uui{  array2 = [NSMutableArray arrayWithContentsOfFile:Path2];  string = (NSString *)[array2 objectAtIndex:3];  NSString *string2 = @"Partly Cloudy";    NSString *trimmedString = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];  NSLog(@"%@ , %@", trimmedString, string2);   if ([trimmedString isEqualToString:string2])   {     NSLog(@"frack");   }}

?