Collectionview performBatchUpdates崩溃

Question

我正在尝试使用insertItemsAtIndexPaths将新项添加到我的集合视图中。我的应用程序在performBatchupdate崩溃

- (void) addItems {
    NSArray *newProducts = @[@"1",@"2",@"3",@"4"];
    [self.collectionView performBatchUpdates:^{
        NSMutableArray *arrayWithIndexPaths = [NSMutableArray array];
        for (NSInteger index = self.array.count; index < (self.array.count + newProducts.count); index++) {
            [arrayWithIndexPaths addObject:[NSIndexPath indexPathForRow:index inSection:0]];
        }
        [self.array addObjectsFromArray:newProducts];
        [self.collectionView insertItemsAtIndexPaths:arrayWithIndexPaths];
    }
                                  completion:nil];
}

以下是崩溃日志：

  

* 断言失败 - [UICollectionView _createPreparedCellForItemAtIndexPath：withLayoutAttributes：applyAttributes：]

当单元格未在集合视图中注册时，会发生此断言。我正在注册我的手机。

Answer 1

这对我有用： 如果Collection视图为空，则重新加载insertItems。

- (void)addItems {

    NSArray *newProducts = @[@"1",@"2",@"3",@"4"];
    NSMutableArray *arrayWithIndexPaths = [NSMutableArray array];

    for (NSInteger index = self.array.count; index < (self.array.count + newProducts.count); index++) {
        [arrayWithIndexPaths addObject:[NSIndexPath indexPathForRow:index inSection:0]];
    }

    if (self.array) {
        [self.array addObjectsFromArray:newProducts];
        [self.collectionView performBatchUpdates:^{
            [self.collectionView insertItemsAtIndexPaths:arrayWithIndexPaths];
        }
                                      completion:nil];
    }
    else {
        self.array = [[NSMutableArray alloc] initWithArray:newProducts];
        [self.collectionView reloadData];

    }
}