UICollectionView集合视图-创新互联

第二个参数 : cell 的布局
   UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout
                                               alloc]init];
滚动方向:
   flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal ;

行间距(最小)
  flowLayout.minimumLineSpacing = 0;

列间距(最小)
   flowLayout.minimumInteritemSpacing = 30;

item大小
   flowLayout.itemSize = CGSizeMake(40, 30);

setcion 的边距
   flowLayout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);

header 大小
   flowLayout.headerReferenceSize = CGSizeMake(320, 20);

footer大小
   flowLayout.footerReferenceSize = CGSizeMake(320, 20);

创建集合视图

UICollectionView * cView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, 320, 568 ) collectionViewLayout:flowLayout];
   cView.dataSource = self; 设置 dataSource 代理
   cView.delegate = self;     设置delegate 代理
   [self.view addSubview:cView];

集合视图cell 的数量

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
   return 100;
}

集合视图 设定 cell

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
   MyCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellidentifier forIndexPath:indexPath];
   cell.backgroundColor = [UIColor redColor];
   cell.textLavel.text = [NSString stringWithFormat:@"%ld",(long)indexPath.row];

   return cell;
}

Header 和 Footer 设置

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
{
 if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {

   HeaderView * headerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headeridentifier forIndexPath:indexPath];
   return headerView;
 }

   FooterView * footerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:footeridentifier forIndexPath:indexPath];

   return footerView;

}

点击Collection 的cell 时 触发 此方法

#pragma mark - UICollectionViewDelegate
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{

}

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