如何在TableView中

Question

獲取特定的細胞這是我的表視圖至今：點擊here

正如你可以看到我在我的TableView 4項。我已經加載了一個Core Data數組。在我的Core數據實體中，我有一個名爲「Paid」的屬性，設置爲BOOLEAN默認值「NO」。我的表視圖鏈接到一個DetailViewController頁面，其中有一個名爲「Paid」的按鈕。當用戶點擊該按鈕時，該特定項目被標記爲「付費」。所以在我的cellForRowAtIndexPath我檢查是否該項目是否支付。通過圖片顯示我的代碼在這裏一定是錯誤的，因爲只有一個項目被標記爲付費。但是，當我NSLog其他項目在表格視圖中，他們也被標記爲「付費」。下面是我的cellForRowAtIndexPath方法的代碼：

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];  
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];   

NSManagedObjectContext *managedObjectContext = [self managedObjectContext]; 
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"OwedMoney"]; 
YouOweArray = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy]; 
OwedMoney *YouOweObject = [YouOweArray objectAtIndex:indexPath.row]; 

if (YouOweObject.paid.boolValue == NO) 

{ 

    [cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator]; 
    [cell setBackgroundColor:[UIColor redColor]]; 
} 

else if (YouOweObject.paid.boolValue == YES) 
{ 

    [cell setAccessoryType:UITableViewCellAccessoryCheckmark]; 
    [cell setBackgroundColor:[UIColor greenColor]]; 
} 

在我DetailViewController我有一個「有償」按鈕，用下面的代碼：

- (IBAction)paid:(id)sender { 

    //Fetch Entity 

    NSManagedObjectContext *context = [self managedObjectContext]; 
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:@"OwedMoney"]; 

    //Create an array that stores the contents of that entity 

    youOweArray = [[context executeFetchRequest:fetchRequest error:nil] mutableCopy]; 

    //Create managedObjectId 

    NSManagedObject *YouOweData = [youOweArray objectAtIndex:0]; 
    NSManagedObjectID *moID = [YouOweData objectID]; 

    //Successfully got the managedObjectId 

    NSLog(@"This is the id %@", moID); 

    BOOL Found = NO; 
    OwedMoney *Object; 


    for (OwedMoney *OwedObject in youOweArray) 
    { 
     NSManagedObjectID *OwedId = [OwedObject objectID]; 

     NSLog(@"%@", OwedObject); 
     if (OwedId == moID) 
     { 
      Found = YES; 
      Object = OwedObject; 
      break; 
     } 

    } 

    if (Found) 
    { 

     BOOL isPaid = Found; 
     Object.paid = [NSNumber numberWithBool:isPaid]; 

     NSLog(@"Is it paid: %@",Object.paid.boolValue? @"Yes":@"No"); 

     NSError *error = nil; 
     [self.managedObjectContext save:&error]; 
    } 
} 

Answer 1

從主控制器以選擇對象的引用，並把在你的線上：

NSManagedObject *YouOweData = [youOweArray objectAtIndex:0]; 

並將其替換爲;

NSManagedObject *YouOweData = [youOweArray objectAtIndex:i]; 

檢查所選行中的mainController，你必須做出一個屬性DetailViewController：

@property (nonatomic) int selectedIndex; 

在MainController，你必須設置在didSelectRowAtIndexPath方法的屬性值。假設detailController是DetailViewController的對象。

設置爲：

detailController.selectedIndex = indexPath.row; 

在detailViewController：

NSManagedObject *YouOweData = [youOweArray objectAtIndex:selectedIndex];