的UILabel文本不能設置

Question

我決定使用不可重複使用的，自定義的UITableView細胞在我的項目，因爲我在每個單元上運行一個計時器，並更新一個細胞的定時器可重複使用的細胞復位所有的計時器。實際上，定時器在我的視圖控制器中運行，但輸出顯示在單元格中。但是這個問題更基本：爲什麼單元格中的UILabel文本沒有被更新？我在IB：nameLabel和timeLabel中設置了2個插座，並將它們連接到單元的頭文件，IB顯示連接的插座。但是，即使試圖將字符串移入UILabel文本字段也會導致「無」。我懷疑我正在做一些基本錯誤的事情，但我無法弄清楚。使用可重複使用的單元時沒有問題。以下是分配和初始化可變數組來保存單元格，添加單元格，然後嘗試將文字字符串移入其中的代碼部分。在NSLog語句中設置斷點顯示cell.nameLabel.text爲'nil'。任何幫助將不勝感激！我已閱讀UITableViewCell參考和編程指南，但他們只討論使用可重用單元。我認爲將'reuseIdentifier'設置爲'nil'會得到一個不可重用的單元，但我不確定。

-(IBAction)addNewItem:(id)sender 
{ 
    // get a new item. 
    NRCItem *newItem = [[NRCItemStore sharedStore] createItem]; 

    // set timerType to 1 (seconds) - default 
    newItem.timerType = 1; 

    // get a timer controller 
    NRCTimerControllerViewController *timerViewController = [[NRCTimerControllerViewController alloc]init]; 

    // set timer controller's item 
    timerViewController.item = newItem; 

    // get a new tableViewCell 

    if(!_myTableViewCells){ 
     _myTableViewCells = [[NSMutableArray alloc]init]; 
    } 

     NRCItemCell *cell = [[NRCItemCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:nil]; 
     cell.nameLabel.text =@"cell"; 
     NSLog(@"addTableViewCell cell= %@", cell); 

     [_myTableViewCells addObject:cell]; 

    // push the timerViewController onto the navigation controller's stack 
    [self.navigationController pushViewController:timerViewController animated:YES]; 

} 

輸入代碼在這裏

Answer 1

我想我是沒有設置在廈門國際銀行文件的委託。代碼現在正在工作。

- (IBAction)addNewItem:(id)sender 
{ 
    // control comes here when a new item is requested by the user, for example. 
    // by clicking on a button in the view's navigation bar 


    NRCtimerItem *item = [[NRCItemStore sharedStore]createItem]; 


    NRCDetailViewController *controller = [[NRCDetailViewController alloc]init]; 
    self.timerItem = item; 
    self.timerItem.timerSet = NO; 
    self.timerItem.resetHistory = [[NSMutableArray alloc]init]; 
    // Give detail view controller a pointer to the item object in row 
    controller.item = item; 
    controller.timerLabels = self.timerLabels; 
    controller.delegate = self; 

    // Push it onto the top of the navigation controller's stack 
    [self.navigationController pushViewController:controller 
             animated:YES]; 

    // add the row to tableView 
    NSUInteger row =[[[NRCItemStore sharedStore]allItems] indexOfObject:item]; 
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; 
    [self.tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; 
    self.timerItem.timerSet = YES; 
} 

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    // Get a new or recycled cell 
    NRCItemCell *cell = [tableView dequeueReusableCellWithIdentifier:@"NRCItemCell" forIndexPath:indexPath]; 

    NRCtimerItem *item = [[[NRCItemStore sharedStore]allItems]objectAtIndex:indexPath.row]; 
    self.timerItem = item; 
    if(self.timerItem.timerSet ==NO){ 
     return cell; 
    } 
    // ****************************** 
    else{ 

    [self handleTimer]; 

    return cell; 
    } 
} 
    -(void)handleTimer{ 

    if(self.timerItem.timerSet == NO) 
    { 
    self.timerItem.timerSet = YES; 
     if(self.timerItem.timerReset == NO) 
     { 
      self.timerItem.startTime = [NSDate date]; 
      //self.timerItem.lastReset = [NSDate date]; 
      NSLog(@"Setting current date/time to %@", self.timerItem.startTime); 
     } 
    switch (self.timerItem.timerType) { 
     case 0:// date only 
     { 
      self.timerItem.interval = 0.5; 
     } 
      break; 
     case 1:// seconds 
     { 
      NSTimeInterval timeInterval = 1; 
      self.timerItem.interval = timeInterval; 
     } 
      break; 
     case 2:// minutes 
     { 
      NSTimeInterval timeInterval = 60; 
      self.timerItem.interval = timeInterval; 
     } 
      break; 
     case 3:// hours 
     { 
      NSTimeInterval timeInterval = 3600; 
      self.timerItem.interval = timeInterval; 
     } 
      break; 
     case 4:// days 
     { 
      NSTimeInterval timeInterval = 3600*24; 
      self.timerItem.interval = timeInterval; 
     } 
      break; 
     case 5:// months 
     { 
      NSTimeInterval timeInterval = 3600*24*30; 
      self.timerItem.interval = timeInterval; 
     } 
      break; 
     case 6:// years 
     { 
      NSTimeInterval timeInterval = 3600*24*365; 
      self.timerItem.interval = timeInterval; 

     } 
      break; 
     } 
      NSLog(@"Date/time was set to %@", self.timerItem.startTime); 

      NSTimeInterval interval =[self.timerItem.startTime timeIntervalSinceNow]; 
      interval = (-1 * interval); 
      if(self.timerItem.interval && self.timerItem.interval >= interval){ 
       self.timerItem.interval = self.timerItem.interval - interval; 
      } 
     } 


    //NSLog(@"timer %@ fired", self.timerItem.timerName); 

    // here we schedule the timer to fire after an interval based on the timerType. 
    self.timerItem.timer = [NSTimer scheduledTimerWithTimeInterval:self.timerItem.interval target:self selector:@selector(calculateTimer:) userInfo:self.timerItem repeats:YES]; 



    [self.timerItem.timer fire]; 


}