CollectionView的每個Section也可以自定義Header與Footer，本節(jié)講解如何創(chuàng)建自定義的Header與Footer。

1、創(chuàng)建自定義Header/Footer類（XIB方式）

創(chuàng)建一個自定義類，繼承自：UICollectionReusableView

創(chuàng)建一個xib文件，并添加一個：Collection Reusable View控件

定義樣式

2、注冊Header與Footer

分別添加Header與Footer的可重用標(biāo)示符

staticNSString*constreuseIdentifierHeader=@"MYHeaderCell";

staticNSString*constreuseIdentifierFooter=@"MYFooterCell";

在viewDidLoad方法中注冊Header與Footer

[self.collectionView registerNib:[UINibnibWithNibName:@"MYHeaderView"bundle:nil]forSupplementaryViewOfKind:UICollectionElementKindSectionHeaderwithReuseIdentifier:reuseIdentifierHeader];

[self.collectionView registerNib:[UINibnibWithNibName:@"MYFooterView"bundle:nil]forSupplementaryViewOfKind:UICollectionElementKindSectionFooterwithReuseIdentifier:reuseIdentifierFooter];

3、實現(xiàn)Header與Footer的數(shù)據(jù)源方法

實現(xiàn)CollectionView的viewForSupplementaryElementOfKind：代理方法，并設(shè)置Header、Footer的一些屬性，如下：

-(UICollectionReusableView*)collectionView:(UICollectionView*)collectionView viewForSupplementaryElementOfKind:(NSString*)kind atIndexPath:(NSIndexPath*)indexPath{

UICollectionReusableView*supplementaryView;

if([kind isEqualToString:UICollectionElementKindSectionHeader]){

MYHeaderView*view=(MYHeaderView*)[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeaderwithReuseIdentifier:reuseIdentifierHeader forIndexPath:indexPath];

view.headerLabel.text=[NSStringstringWithFormat:@"這是header:%d",indexPath.section];

supplementaryView=view;

}

elseif([kind isEqualToString:UICollectionElementKindSectionFooter]){

MYFooterView*view=(MYFooterView*)[collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionFooterwithReuseIdentifier:reuseIdentifierFooter forIndexPath:indexPath];

view.footerLabel.text=[NSStringstringWithFormat:@"這是Footer:%d",indexPath.section];

supplementaryView=view;

}

returnsupplementaryView;

}

4、設(shè)置Header與Footer的大小

實現(xiàn)UICollectionViewDelegateFlowLayout協(xié)議中的referenceSizeForHeaderInSection以及referenceSizeForFooterInSection方法，設(shè)置Header與Footer的大小

-(CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{

CGFloatscreenWidth=[UIScreenmainScreen].bounds.size.width;

returnCGSizeMake(screenWidth,69);

}

-(CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section{

CGFloatscreenWidth=[UIScreenmainScreen].bounds.size.width;

returnCGSizeMake(screenWidth,50);

}