iOS判断输入框不为空格以及空

//   判定输入框不为空格以及空

   NSString *self.textField=[textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

   if ([self.textField length] == 0) {

        UIAlertView *alertView = [[UIAlertViewalloc] initWithTitle:@""message:@"内容不能为空！"delegate:selfcancelButtonTitle:@"确定"otherButtonTitles:nil];

        [alertViewshow];

       return NO;

    }

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