我在UICollectionView很新。 而且我真的累了，找出解决办法。 我尝试添加页眉在3平铺行。 我使用Collection视图流布局。
这里是我的代码，我实现：
- (void)awakeFromNib {
self.collectionView.backgroundColor = [UIColor colorWithRed:204.0/255.0 green:204.0/255.0 blue:204.0/255.0 alpha:1.0];
self.collectionView.backgroundColor = [UIColor clearColor];
self.collectionView.backgroundView = [[UIView alloc] initWithFrame:CGRectZero];
UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
flowLayout.itemSize = CGSizeMake(130.0, 170.0);
[self.collectionView setCollectionViewLayout:flowLayout];
// Register the colleciton cell
[_collectionView registerNib:[UINib nibWithNibName:@"ORGArticleCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"ORGArticleCollectionViewCell"];
[self.collectionView registerClass:[_HeaderView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderView"];
}
#pragma mark - UICollectionViewDataSource methods
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
if (section == 0) {
return [self.collectionData count];
}
else if(section == 1)
{
return [self.collectionData1 count];
}
else
{
return [self.collectionData2 count];
}
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
ORGArticleCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"ORGArticleCollectionViewCell" forIndexPath:indexPath];
cell.articleTitle.text = [self.collectionData objectAtIndex:[indexPath row]];
NSString *URL = [self.collectionImageData objectAtIndex:indexPath.row];
[cell.articleImage setImageWithURL:[NSURL URLWithString:URL] placeholderImage:[UIImage imageNamed:@"profile-image-placeholder"]];
cell.articleImage.contentMode = UIViewContentModeScaleToFill;
cell.articlePrice.text = [self.collectionDataPric objectAtIndex:[indexPath row]];
return cell;
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *cellData = [self.collectionData objectAtIndex:[indexPath row]];
[[NSNotificationCenter defaultCenter] postNotificationName:@"didSelectItemFromCollectionView" object:cellData];
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
return 0;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
return 0;
}
- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
UICollectionReusableView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:
UICollectionElementKindSectionHeader withReuseIdentifier:@"HeaderView" forIndexPath:indexPath];
UILabel *label = (UILabel *)[headerView viewWithTag:10];
if (!label) {
label = [[UILabel alloc] initWithFrame:CGRectInset(headerView.bounds, 5, 5)];
label.tag = 10;
label.font = [UIFont boldSystemFontOfSize:12];
label.textColor = [UIColor darkGrayColor];
[headerView addSubview:label];
}
label.text = [NSString stringWithFormat:@"Section %d", indexPath.section];
return headerView;
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {
CGSize headerSize = CGSizeMake(320, 44);
return headerSize;
}
在viewForSupplementaryElementOfKind方法我的应用程序崩溃时我初始化头视图。
以下是崩溃日志：
终止应用程序由于未捕获的异常 'NSInternalInconsistencyException'，原因： '没有UICollectionViewLayoutAttributes实例-layoutAttributesForSupplementaryElementOfKind：在路径UICollectionElementKindSectionHeader {长度= 2，路径= 0 - 0}'
