UICollectionView的基本使用 collectionView

#pragma mark -- 创建CollectionView

- (void)createCollectionView{

//关闭自适应

self.automaticallyAdjustsScrollViewInsets = NO;

UICollectionViewFlowLayout *fl = [[UICollectionViewFlowLayout alloc]init];

_collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 64, SCREEN_WIDTH, SCREEN_HEIGHT - 64-49) collectionViewLayout:fl];

_collectionView.dataSource = self;

_collectionView.delegate = self;

_collectionView.backgroundColor = [UIColor colorWithRed:237/255.0 green:237/255.0 blue:237/255.0 alpha:0.8 ];

[self.view addSubview: _collectionView];

//布局

fl.minimumInteritemSpacing = 0;

fl.minimumLineSpacing = 5;

//注册cell

[_collectionView registerNib:[UINib nibWithNibName:@"RootCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"JXCell"];

[_collectionView registerNib:[UINib nibWithNibName:@"JXTeSeCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:@"JXTSCell"];

//注册header

[_collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"oneHeader"];

[_collectionView registerClass:[JXHeaderReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"JXHeader"];

#pragma mark -- 下拉刷新

MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{

//下拉重新加载数据

self.page = 1;

[_dataArr removeAllObjects];

[self loadData];

}];

[header setTitle:@"下拉刷新" forState:MJRefreshStatePulling];

[header setTitle:@"正在刷新" forState:MJRefreshStateRefreshing];

_collectionView.header = header;

//上拉

MJRefreshBackNormalFooter *footer = [MJRefreshBackNormalFooter footerWithRefreshingBlock:^{

//上拉加载更多

self.page += 1;

[self setMyUrl];

[self loadData];

}];

[footer setTitle:@"下拉刷新" forState:MJRefreshStatePulling];

[footer setTitle:@"正在刷新" forState:MJRefreshStateRefreshing];

_collectionView.footer = footer;

}

#pragma mark -- dataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{

return 2;

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{

if (section == 0) {

return 4;

}

return _dataArr.count;

}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{

if (indexPath.section == 0) {

//4个特色专区

JXTeSeCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"JXTSCell" forIndexPath:indexPath];

cell.backgroundColor = [UIColor whiteColor];

if (_teSeArr.count<=0) {

return cell;

}

//与滚动模型 共用

ScrollModel *model = _teSeArr[indexPath.item];

[cell loadDataFromModel:model];

return cell;

}else{

//精品推荐

RootCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"JXCell" forIndexPath:indexPath];

if (_dataArr.count <=0) {

return cell;

}

JXJingPinModel *model = _dataArr[indexPath.item];

[cell loadDataFromJXModel:model];

cell.backgroundColor = [UIColor whiteColor];

return cell;

}

}

//

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

#pragma mark -- 一组 滚动视图

if (indexPath.section == 0) {

UICollectionReusableView *headerView = [self.collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"oneHeader" forIndexPath:indexPath];

ToAdScrollview *scrollView = [[ToAdScrollview alloc]initWithFrame:CGRectMake(0, 0, SCREEN_WIDTH, 200) andImageArr:_scrollArr];

scrollView.backgroundColor = [UIColor whiteColor];

__weak typeof (self)weakSelf = self;

scrollView.block = ^(int index){

//实现点击某个视图跳转

RootWebViewController *webVC = [[RootWebViewController alloc]init];

webVC.hidesBottomBarWhenPushed = YES;

webVC.url = @"http://www.nanyibang.com/school/school.php?id=378";

[weakSelf.navigationController pushViewController:webVC animated:YES];

};

[headerView addSubview: scrollView];

return headerView;

}else{

#pragma mark -- 二组 标题

JXHeaderReusableView *headerView = [self.collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"JXHeader" forIndexPath:indexPath];

return headerView;

}

}

//header高度

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

if (section == 0) {

return CGSizeMake(SCREEN_WIDTH, 202);

}else{

return CGSizeMake(SCREEN_WIDTH, 30);

}

}

//item大小

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{

if (indexPath.section == 0) {

return CGSizeMake((SCREEN_WIDTH - 15)/2, SCREEN_WIDTH/2 - 110);

}else{

return CGSizeMake((SCREEN_WIDTH - 15)/2, SCREEN_WIDTH/2+100);

}

}

//调节item边距

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{

return UIEdgeInsetsMake(5, 5, 0, 5);

}

#pragma mark -- item点击跳转

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{

}