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我正在从事一个项目，其中我有一个数据库 sqlite 3，其中我有 3 个文本列，我正在获取值并将它们显示到视图中，即；text6 fields.but 在我的代码中有一个条件是用户可以填写任何一个文本字段三和二可以是空白但是当我获取值时两个文本字段显示（空）而不是空白值我该如何解决这个问题问题，以便在获取数据后它将显示空白不为空这是我插入数据的代码

    - (void)saveData
    {
        if ((txtfield.text.length==0)||(txtfield1.text.length==0)||(txtfield2.text.length==0)||(txtfield3.text.length==0)||(txtfield4.text.length==0))

            {  
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"fields can't be blank"
                                                     message:@"fill the fields"
                                                    delegate:nil
                                           cancelButtonTitle:@"OK"
                                           otherButtonTitles:nil];

                 [alert show];
               [alert release];
            }
            else{

                NSString* gratitude2 = [NSString stringWithFormat:@"%@",txtfield3.text];
                NSString* gratitude1 = [NSString stringWithFormat:@"%@",txtfield4.text];
                NSString* title = txtfield.text;
                NSString* date = txtfield1.text;
                NSString* gratitude = [NSString stringWithFormat:@"%@",txtfield2.text];

            [dbSingleton() createEditableCopyOfDatabaseIfNeeded];
            [dbSingleton() insertdata:gratitude2 withgratitude1:gratitude1 title:title date:date gratitude:gratitude picture:imageDt audio:self.retrieveData];
            }

这是在 iphone 上显示

            -(void)gototree:(UIButton *)sender
            {

                int tag1=sender.tag;
                 [dbSingleton() createEditableCopyOfDatabaseIfNeeded];
                  NSMutableArray * array=[[NSMutableArray alloc]init];
              array =[dbSingleton() getalldata:tag1];

                NSString *gratitude22=[[array objectAtIndex:0]valueForKey:@"gratitude2"];
                NSString *gratitude11=[[array objectAtIndex:0]valueForKey:@"gratitude1"];
                NSString *title11 = [[array objectAtIndex:0]valueForKey:@"title"];
                NSString *date11=[[array objectAtIndex:0]valueForKey:@"Date"];
                NSString *gratitude=[[array objectAtIndex:0]valueForKey:@"gratitude"];


               txtfield2=[[UITextField alloc]initWithFrame:CGRectMake(28, 164, 200,20)];
               txtfield2.backgroundColor=[UIColor clearColor];

                txtfield2.font=[UIFont fontWithName:@"Helvetica-Bold" size:13.0];
                [self.view addSubview:txtfield2];
                 [txtfield2 setEnabled:NO];

                txtfield2.text=gratitude;

                txtfield3=[[UITextField alloc]initWithFrame:CGRectMake(28, 183, 200,20)];
                txtfield3.backgroundColor=[UIColor clearColor];

                txtfield3.font=[UIFont fontWithName:@"Helvetica-Bold" size:13.0];
                [self.view addSubview:txtfield3];
                 [txtfield3 setEnabled:NO];
                txtfield3.text=gratitude22;


              txtfield4=[[UITextField alloc]initWithFrame:CGRectMake(28, 204, 200,20)];
                txtfield4.backgroundColor=[UIColor clearColor];

                txtfield4.font=[UIFont fontWithName:@"Helvetica-Bold" size:13.0];
                [self.view addSubview:txtfield4];

                 [txtfield4 setEnabled:NO];
                txtfield4.text=gratitude11;
            }
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