在非结构或联合的情况下请求成员 tableView

Posted 2023-03-12

【中文标题】在非结构或联合的情况下请求成员 tableView

【英文标题】：Request for member tableView in something not a structure or union

【发布时间】：2010-12-22 04:08:30

【问题描述】：

请帮助解决这个问题，我正在尝试使用 coreData db 填充我的表格单元格；

我正在将一个示例从 iPhone 移植到 iPad， 问题是在我的表格视图中的 iPad 中。我正在使用：

@interface FailedBanksViewController : UIViewController 
<UITableViewDelegate, UITableViewDataSource, NSFetchedResultsControllerDelegate>

不是

@interface FailedBanksListViewController : UITableViewController      <NSFetchedResultsControllerDelegate>

对于整个表格视图，但在我的视图中，

所以我得到了错误：

“在非结构或联合的情况下请求成员 'tableView'”

对于我的代码，

看看下面的代码，我希望这是唯一的问题：

#import "FailedBanksViewController.h"
#import "FailedBankInfo.h"


@implementation FailedBanksViewController
@synthesize context = _context;
@synthesize fetchedResultsController = _fetchedResultsController;


- (NSFetchedResultsController *)fetchedResultsController 

if (_fetchedResultsController != nil) 
    return _fetchedResultsController;


NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"FailedBankInfo" inManagedObjectContext:_context];
[fetchRequest setEntity:entity];

NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"details.closeDate" ascending:NO];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];

[fetchRequest setFetchBatchSize:20];

NSFetchedResultsController *theFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:_context sectionNameKeyPath:nil cacheName:@"Root"];
self.fetchedResultsController = theFetchedResultsController;
_fetchedResultsController.delegate = self;

[fetchRequest release];
[theFetchedResultsController release];

return _fetchedResultsController;    



- (void)viewDidLoad 
[super viewDidLoad];


NSError *error;
if (![[self fetchedResultsController] performFetch:&error]) 
    // Update to handle the error appropriately.
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    exit(-1);  // Fail




- (void)didReceiveMemoryWarning 
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.



- (void)viewDidUnload 
self.fetchedResultsController = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;




- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
return 1;





- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 

id <NSFetchedResultsSectionInfo> sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];

//return [array count];
//return [[fetchedResultsController sections] count];




- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath 

FailedBankInfo *info = [_fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = info.name;
cell.detailTextLabel.text = [NSString stringWithFormat:@"%@, %@", info.city, info.state];




//---insert individual row into the table view---

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 

static NSString *CellIdentifier = @"Cell";
//---try to get a reusable cell---

UITableViewCell *cell = [tableView  dequeueReusableCellWithIdentifier:CellIdentifier];



//---create new cell if no reusable cell is available---

if (cell == nil) 

    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

      
[self configureCell:cell atIndexPath:indexPath];

return cell;


//cell.textLabel.text = [array objectAtIndex:indexPath.row]; 


//return cell;

 



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 

[tableView deselectRowAtIndexPath:indexPath animated:YES];






- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
// Overriden to allow any orientation.
return YES;





- (void)dealloc 
[super dealloc];



# FROM HERE THE ERRORS!!!
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller 
// The fetch controller is about to start sending change notifications, so prepare the table view for updates.
[self.tableView beginUpdates];



- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath 

UITableView *tableView = self.tableView;

switch(type) 

    case NSFetchedResultsChangeInsert:
        [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
        break;

    case NSFetchedResultsChangeDelete:
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        break;

    case NSFetchedResultsChangeUpdate:
        [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
        break;

    case NSFetchedResultsChangeMove:
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
        // Reloading the section inserts a new row and ensures that titles are updated appropriately.
        [tableView reloadSections:[NSIndexSet indexSetWithIndex:newIndexPath.section] withRowAnimation:UITableViewRowAnimationFade];
        break;




- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type 

switch(type) 

    case NSFetchedResultsChangeInsert:
        [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
        break;

    case NSFetchedResultsChangeDelete:
        [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex] withRowAnimation:UITableViewRowAnimationFade];
        break;




- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller 
// The fetch controller has sent all current change notifications, so tell the table view to process all updates.
[self.tableView endUpdates];


@end

【参考方案1】：

UIViewController 根本没有名为 tableView 的实例变量/属性。自己添加属性并实现所有必要的方法来替换 UITableViewController 或继续使用 UITableViewController 作为基类。

【讨论】：

嗨，这又是我的问题，我是 objC 的新手，不知道你的意思是什么，我怎样才能自己添加属性？以及如何实施必要的方法？谢谢