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iphone - -[UICollectionViewData numberOfItemsBeforeSection :] 中的断言失败

转载 作者:技术小花猫 更新时间:2023-10-29 10:14:42 24 4
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使用 IOS 6 和新的 UICollectionView我在 UIViewController 上有 2 个 UICollectionViews 并使用 Storyboard单击 UICollectionView 时出现以下错误我不确定为什么会发生这种情况,Google 会为此错误返回 0 个结果...

2012-10-13 20:30:06.421 MyApp[768:907] Assertion failure in -[UICollectionViewData numberOfItemsBeforeSection:], /SourceCache/UIKit/UIKit-2372/UICollectionViewData.m:415
2012-10-13 20:30:06.427 MyApp[768:907] Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'request for number of items before section 2147483647 when there are only 1 sections in the collection view'

我根本没有使用 Sections 并将其设置为只有 1 个部分:

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}

当我点击 UICollectionView 区域时,它发生了(似乎是随机的)我有一段代码可以从 UICollectionView 中删除元素:

[tilesArray removeObjectAtIndex:indexPath.row];
[self.tilesCollectionView reloadData];
[resultsArray addObject:str];
[self.resultsCollectionView reloadData];

这是数组如何连接到 UICollectionViews

-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {

if(collectionView.tag == 2)
return [resultsArray count];
else
return [tilesArray count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

if(collectionView.tag == 2)
{
static NSString *cellIdentifier = @"ResultCell";
ResultCell *cell = (ResultCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

cell.mainImage.image = [UIImage imageNamed:currentArtContainer.tileMainImage];

NSString *cellData = [resultsArray objectAtIndex:indexPath.row];
[cell.titleLabel setText:cellData];

return cell;
}
else
{
static NSString *cellIdentifier = @"TileCell";
TileCell *cell = (TileCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];

cell.topImage.image = [UIImage imageNamed:currentArtContainer.tileTopImage];

cell.mainImage.image = [UIImage imageNamed:currentArtContainer.tileMainImage];

NSString *cellData = [tilesArray objectAtIndex:indexPath.row];
[cell.titleLabel setText:cellData];

return cell;
}
}

请帮我解决这个问题。甚至不确定如何捕获异常,因为它来自 UICollectionView 内部代码。还忘了提到我正在为 UICollectionView 使用自定义布局,但我不知道它是否与此问题有关。

再次感谢您的帮助!

编辑:在调用所有布局方法后出现异常...这是我的自定义布局...我仍然不确定如何修复它,因为我所有的 try catch block 都没有捕获错误...

- (void)prepareLayout
{
NSLog(@"In prepareLayout.");

[super prepareLayout];
_cellCount = [[self collectionView] numberOfItemsInSection:0];
}

- (CGSize)collectionViewContentSize
{
NSLog(@"In collectionViewContentSize.");
@try {

CGSize csize = [self collectionView].frame.size;
NSLog(@"In here.");
return csize;
}
@catch(NSException *exception)
{
NSLog(@"collectionViewContentSize %@: %@",[exception name],[exception reason]);
}

}

- (UICollectionViewLayoutAttributes *)layoutAttributesForItemAtIndexPath:(NSIndexPath *)indexPath
{
@try {

NSLog(@"In layoutAttributesForItemAtIndexPath. item %d", indexPath.row);


UICollectionViewLayoutAttributes* attributes = [UICollectionViewLayoutAttributes layoutAttributesForCellWithIndexPath:indexPath];

attributes.size = CGSizeMake(ITEM_SIZE, ITEM_SIZE);

NSLog(@"firstRun %d", self.firstRun);
//NSLog(@"panStatus %@", self.panStatus);

if (self.firstRun == 0) {
CGFloat x = 0, y = 0;
CGFloat boundx = self.collectionView.frame.size.width * 0.70; // Use the whole canvas
CGFloat boundy = self.collectionView.frame.size.height * 0.70; // Use the whole canvas
while (x < 50 || x > boundx) x = arc4random() % (int)boundx + indexPath.item;
while (y < 50 || y > boundy) y = arc4random() % (int)boundy + indexPath.item;

NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
if (self.positions)
dictionary = [self.positions mutableCopy];
[dictionary setObject:[NSValue valueWithCGPoint:CGPointMake(x, y)] forKey:@(indexPath.item)];
if (!self.positions)
self.positions = [[NSDictionary alloc] init];
self.positions = dictionary;

attributes.center = CGPointMake(x, y);
} else if (self.firstRun > 0) {
CGPoint point = [[self.positions objectForKey:@(indexPath.item)] CGPointValue];
attributes.center = CGPointMake(point.x, point.y);
}

NSLog(@"END layoutAttributesForItemAtIndexPath. item %d", indexPath.row);
return attributes;

}
@catch(NSException *exception)
{
NSLog(@"layoutAttributesForItemAtIndexPath %@: %@",[exception name],[exception reason]);
}
}

-(NSArray *)layoutAttributesForElementsInRect:(CGRect)rect
{
@try {

NSLog(@"layoutAttributesForElementsInRect ...");

NSMutableArray* attributes = [NSMutableArray array];
for (NSInteger i=0 ; i < self.cellCount; i++) {
NSIndexPath* indexPath = [NSIndexPath indexPathForItem:i inSection:1];
[attributes addObject:[self layoutAttributesForItemAtIndexPath:indexPath]];
}
NSLog(@"END layoutAttributesForElementsInRect ...");
return attributes;

}
@catch(NSException *exception)
{
NSLog(@"layoutAttributesForElementsInRect %@: %@",[exception name],[exception reason]);
}
}

最佳答案

我在从手势识别器运行 reloadData 时发生了这种情况,在手势识别器上设置 delaysTouchesBegan 有所帮助。

关于iphone - -[UICollectionViewData numberOfItemsBeforeSection :] 中的断言失败,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12878451/

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