一、纯代码的实现

首先，讲一下UICollectionView的纯代码的创建，创建CollectionView，得先创建UICollectionViewLayout，

UICollectionViewFlowLayout *layout = [UICollectionViewFlowLayout new];

layout.scrollDirection = UICollectionViewScrollDirectionVertical;

layout.itemSize = CGSizeMake(100, 100);

layout.minimumLineSpacing = 10;

layout.minimumInteritemSpacing = 10;

layout.sectionHeadersPinToVisibleBounds = YES;

layout.sectionFootersPinToVisibleBounds = YES;

再创建CollectionView，CollectionView和TableView类似，只是CollectionView由CollectionViewFlowLayout来管理，建议大家使用UICollectionViewDelegateFlowLayout来对CollectionView进行管理，具体细节请看链接的代码。

self.DQCollectionView = [[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:layout];

[self.view addSubview:self.DQCollectionView];

self.DQCollectionView.delegate = self;

self.DQCollectionView.dataSource = self;

[self.DQCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cell"];

self.DQCollectionView.backgroundColor = [UIColor whiteColor];

[self.DQCollectionView registerNib:[UINib nibWithNibName:@"DQHeaderFooterView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header"];

[self.DQCollectionView registerNib:[UINib nibWithNibName:@"DQHeaderFooterView" bundle:nil] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"footer"];

请看效果，

图1

图2

不过两个设置，要iOS 9.0才有效

@property (nonatomic) BOOL sectionHeadersPinToVisibleBounds NS_AVAILABLE_IOS(9_0);

@property (nonatomic) BOOL sectionFootersPinToVisibleBounds NS_AVAILABLE_IOS(9_0);

二、xib的实现

首先拉进CollectionView，再设置CollectionViewFlowLayout。

图3

图4

再设置 sectionHeadersPinToVisibleBounds/sectionFootersPinToVisibleBounds

图5

NO:跟随CollectionView滚动，YES:header 悬挂头部，footer 悬挂尾部

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代码的地址：github地址