在CollectionView添加头部视图

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关键代码如下：

static NSString *headerViewIdentifier = @"hederview";-(void)addCollectionView{    _layout = [[UICollectionViewFlowLayout alloc]init];    _layout.minimumLineSpacing=20; //设置每一行的间距    _layout.itemSize=CGSizeMake((kDeviceWidth - 38) / 2, (kDeviceWidth - 38) / 2 + 50 );  //设置每个单元格的大小    _layout.sectionInset=UIEdgeInsetsMake(20, 14, 20, 14);//设置间隔    _layout.headerReferenceSize=CGSizeMake(self.view.frame.size.width,60); //设置collectionView头视图的大小        _collectionView =[[UICollectionView alloc]initWithFrame:self.view.bounds collectionViewLayout:_layout];    _collectionView.delegate=self;    _collectionView.dataSource=self;    self.defaultView.hidden=YES;    _collectionView.frame=self.view.bounds;    _collectionView.backgroundView=self.defaultView;    _collectionView.backgroundColor=kColorTextGray_246;        //注册cell单元格    [_collectionView registerClass:[DiscoveryCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];    //注册头视图    [_collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerViewIdentifier];    [self.view addSubview:_collectionView];}

//  返回头视图- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{    //如果是头视图    if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {        UICollectionReusableView *header=[collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headerViewIdentifier forIndexPath:indexPath];        //头视图添加view        [header addSubview:self.scrollView];        [header addSubview:self.pageControl];        return header;    }    return nil;}

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