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将项目标记为TableView中新添加的项目(Marking an item as newly added in TableView)

 我有一个UITableView，只需按一下按钮即可添加新项目。 我想强调这个新添加的项目。 由于UITableView是数据驱动的并且单元格是循环使用的，所以我能想到的唯一方法来标记这个新添加的项目是在数据本身中添加BOOL标志，然后突出显示单元格并在第一次遇到时取消标记。  
 有没有其他方法可以做到这一点，而不必污染数据源？ 

I have a UITableView where I can add a new item with a touch of a button. I would like to highlight this newly added item. Since UITableView is data-driven and cells are recycled, the only way I can think of so far to mark this newly added item is to add a BOOL flag in the data itself, then highlight the cell and negate the flag on first encounter. 
Is there another way of doing this without having to contaminate the data source?

原文：https://stackoverflow.com/questions/8360628

更新时间：2023-08-24 18:08

最满意答案

 通常在WHEN-VALIDATE-ITEM上使用GO_BLOCK或GO_ITEM是有限制的。 然而，有几种方法可以解决这个问题。 一种方法是使用WHEN-TIMER-EXPIRED触发器。 这里是如何 -  
 WHEN-TIMER-EXPIRED  
Begin    
if GET_APPLICATION_PROPERTY(TIMER_NAME) = 'NEW_TIMER' then    
   CALL_PROG_UNIT(); --This is your Procedure that calls the GO_BLOCK   
   /*Do rest of validation here*/
end if;
END;
 
 WHEN-VALIDATE-ITEM  
DECLARE    
  timer_id TIMER;    
Begin        
  timer_id := CREATE_TIMER('NEW_TIMER',1,NO_REPEAT);    --set a short timer so that the WHEN-TIMER-EXPIRED trigger is fired immediately
End;
 
 会发生什么 - 一旦调用CREATE_TIMER函数，这将创建＆到期计时器，然后表单级触发器WHEN-TIMER-EXPIRED将检查过期的计时器名称并调用具有GO_BLOCK程序单元。 希望这可以帮助。  
 
 UPDATE  
 Jeffery Kemp先生希望看到证明这个解决方案有效。 所以在这里 -  
 一个带有两个块BLOCK1和BLOCK2的Oracle表单，其中包含文本项  
 
 WVI触发器  
 
 WTE表格触发器。 这将首先调用带有GO_BLOCK函数调用的PROGRAM UNIT P_CALL_PROC ，然后对字段Number 2一些验证。  
 
 这是P_CALL_PROC  
 
 这里是结果 -  
 
 和  
 
 这是一个Youtube链接，用于查看表单的实际效果。 

Usually there is a restriction on using GO_BLOCK or GO_ITEM on a WHEN-VALIDATE-ITEM. However there are a couple of ways to overcome this. One way is to use a WHEN-TIMER-EXPIRED trigger. Here is how- 
WHEN-TIMER-EXPIRED 
Begin    
if GET_APPLICATION_PROPERTY(TIMER_NAME) = 'NEW_TIMER' then    
   CALL_PROG_UNIT(); --This is your Procedure that calls the GO_BLOCK   
   /*Do rest of validation here*/
end if;
END;
 
WHEN-VALIDATE-ITEM 
DECLARE    
  timer_id TIMER;    
Begin        
  timer_id := CREATE_TIMER('NEW_TIMER',1,NO_REPEAT);    --set a short timer so that the WHEN-TIMER-EXPIRED trigger is fired immediately
End;
 
What happens is - This will create & expire the timer as soon as the CREATE_TIMER function is called and then the form level trigger WHEN-TIMER-EXPIRED will check the expired timer name and call your program unit that has the GO_BLOCK. Hope this helps. 
 
UPDATE 
Mr Jeffery Kemp wanted to see proof that this solution works. So here it is- 
An Oracle form with two Blocks BLOCK1 and BLOCK2 with text items on it 
 
W-V-I Trigger 
 
W-T-E Form Trigger. This calls a PROGRAM UNIT P_CALL_PROC with GO_BLOCK function call first and then does some validations on the field Number 2. 
 
Here is P_CALL_PROC 
 
And here is the result- 
 
And 
 
Here is a Youtube link to see the Form in action.