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UICollectionView 基础

时间:2015-07-15 编辑:偷窃者 来源:Cnblogs
 UICollectionViewFlowLayout *flowLayout= [[UICollectionViewFlowLayout alloc] init];     flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;//滚动方向     flowLayout.minimumLineSpacing = 10.0;//行间距(最小值)     flowLayout.minimumInteritemSpacing = 50.0;//item间距(最小值)     flowLayout.itemSize = CGSizeMake(50, 50);//item的大小     flowLayout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);//设置section的边距     flowLayout.headerReferenceSize = CGSizeMake(320, 20);     flowLayout.footerReferenceSize = CGSizeMake(320, 20);     //第二个参数是cell的布局     UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, 320, 568) collectionViewLayout:flowLayout];     [flowLayout release];     collectionView.dataSource = self;     collectionView.delegate = self;     collectionView.backgroundColor = [UIColor orangeColor];     //1 注册复用cell(cell的类型和标识符)(可以注册多个复用cell, 一定要保证重用标示符是不一样的)注册到了collectionView的复用池里     [collectionView registerClass:[CLCollectionViewCell class] forCellWithReuseIdentifier:cellIdentifier];           //第一个参数:返回的View类型     //第二个参数:设置View的种类(header, footer)     //第三个参数:设置重用标识符    [collectionView registerClass:[HeadView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:headerIdentifier];     [collectionView registerClass:[FootView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:footerIdentifier];     [self.view addSubview:collectionView];     #pragma mark - UICollectionViewDataSource - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {     return 10; }   - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {     return 10; }   - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {     //2 从复用池中找cell(1:cell的标示符 2:indexPath决定系统用不用再给你创建cell, 不用创建的话, 就直接使用之前的cell)     CLCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];     cell.backgroundColor = [UIColor yellowColor];     cell.textLabel.text = [NSString stringWithFormat:@"%ld", (long)indexPath.row];     return cell; }   - (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {     if (kind == UICollectionElementKindSectionHeader) {         HeadView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:headerIdentifier forIndexPath:indexPath];         headerView.textLabel.text = @"让我组成头部!";         headerView.textLabel.textAlignment = NSTextAlignmentCenter;         headerView.textLabel.textColor = [UIColor whiteColor];         return headerView;     }     FootView *footerView = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:footerIdentifier forIndexPath:indexPath];     footerView.textLabel.text = @"让我组成尾部!";     footerView.textLabel.textAlignment = NSTextAlignmentCenter;     footerView.textLabel.textColor = [UIColor whiteColor];     return footerView; }   #pragma mark - UICollectionViewDelegate - (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {     NSLog(@"%d %d", indexPath.section, indexPath.row); }     #pragma mark - UICollectionViewDelegateFlowLayout /* - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { } - (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section {       } - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section {       } - (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {       } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section {       } - (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section {       }  */                         [collectionView registerClass:[FootView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:footerIdentifier];     [self.view addSubview:collectionView];
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