Question

我试图使用以下代码将项目插入到集合视图中：

- (IBAction)addCards:(UIButton *)sender {
    int numberOfCardsToAdd = EXTRA_CARDS_NUMBER;
    if ([[self.collectionView visibleCells] count] == 0) {
        numberOfCardsToAdd = self.startingCardCount;}

    // loop through the game model, draw random cards from the deck and assign it to the array
    // take into account the "no cards left in deck" case

    for (int i = 0; i < numberOfCardsToAdd; i++) {
        if (![self.game.deck isEmpty]) {
            SetsCard *cardToAdd = (SetsCard *) [self.game.deck drawRandomCard];
            if (cardToAdd) [self.game.cards addObject:cardToAdd];

            NSIndexPath *newObject = [[NSIndexPath alloc] initWithIndex:[self.game.cards indexOfObject:cardToAdd]];

            [self.collectionView insertItemsAtIndexPaths:@[newObject]]; // adding card to view
        }
    }
    [self.collectionView reloadData];
}

我收到了这个错误：

Assertion failure in -[NSIndexPath row], /SourceCache/UIKit_Sim/UIKit-2380.17/UITableViewSupport.m:2680
2013-06-13 09:09:12.443 Improved Matchismo[1206:c07] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid index path for use with UITableView.  Index paths passed to table view must contain exactly two indices specifying the section and row.  Please use the category on NSIndexPath in UITableView.h if possible.'

*** First throw call stack:
(0x1cb1012 0x10eee7e 0x1cb0e78 0xb84665 0x29eb6c 0x54b14d 0x53fd69 0x53e60e 0x53e646 0x926e 0x1102705 0x362c0 0x36258 0xf7021 0xf757f 0xf66e8 0x65cef 0x65f02 0x43d4a 0x35698 0x1c0cdf9 0x1c0cad0 0x1c26bf5 0x1c26962 0x1c57bb6 0x1c56f44 0x1c56e1b 0x1c0b7e3 0x1c0b668 0x32ffc 0x269d 0x25c5)
libc++abi.dylib: terminate called throwing an exception

这真让我感到困惑，因为我正在向UICollectionView而不是UITableView添加项目，而我的应用根本不会使用UITableView的任何实例。有谁知道我为什么会遇到这个错误，以及如何修复它？

非常感谢！

Answer 1

集合视图与两级索引路径（部分/行）的工作方式相同一个表视图，所以你应该创建索引路径

NSIndexPath *newObject = [NSIndexPath indexPathForRow:... inSection:0];

如果只有一个部分（第0部分）。

-[NSIndexPath row]在@interface NSIndexPath (UITableView)类别中声明，并且在iOS 6中引入集合视图时可能未更改错误消息，因此消息“与UITableView一起使用的无效索引路径”具有误导性

使用UICollectionView时UITableView的NSInternalInconsistencyException？

1 个答案: