UICollectionView的使用代理方法

pragma mark - 创建UI

-(void)createUI
{
// 创建网格
布局对象 UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc]init];
//设置滚动方向
flowLayout.scrollDirection = UICollectionViewScrollDirectionVertical;
//创建网格对象
_collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, SCREEN_W, SCREEN_H) collectionViewLayout:flowLayout];
//设置背景色，系统默认的是黑色的
_collectionView.backgroundColor = [UIColor whiteColor];
//设置代理
_collectionView.delegate = self; _collectionView.dataSource = self; [self.view addSubview:_collectionView];
//注册cell类
[_collectionView registerClass:[MusicCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
//注册header类
[_collectionView registerClass:[MusicCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"view"]; //注册footer类
[_collectionView registerClass:[MusicCollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionFooter withReuseIdentifier:@"view"];}

pragma mark - 实现代理方法

//确定section的个数
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; }

//确定每个section对应的item的个数
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.imageArray.count; }

//创建cell
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { MusicCollectionViewCell * cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath]; //赋值 [cell.imageView setImage:[UIImage imageNamed:self.imageArray[indexPath.item]]]; cell.titleLabel.text = self.nameArray[indexPath.item]; return cell; }
//设置item的大小
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { return CGSizeMake((SCREEN_W - 20) / 2, 150); }
//设置垂直间距,默认的垂直和水平间距都是10
-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section { return 5; }
//设置水平间距
-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section { return 5; }

//四周的边距
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section { return UIEdgeInsetsMake(5, 5, 5, 5); }
//设置header的大小
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section { return CGSizeMake(60, 30); }
//设置footer的大小
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section { return CGSizeMake(60, 30); }
//设置header和footer的view
-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath { MusicCollectionReusableView * view = [collectionView dequeueReusableSupplementaryViewOfKind:kind withReuseIdentifier:@"view" forIndexPath:indexPath]; //分别给header和footer赋值 if (kind == UICollectionElementKindSectionHeader) { view.titleLabel.text = @"段头"; } else { view.titleLabel.text = @"段尾"; } return view; }
设置选中
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath { MusicDetailViewController * vc = [[MusicDetailViewController alloc]init]; //传值 vc.typeString = self.nameArray[indexPath.item]; vc.urlString = self.urlArray[indexPath.item]; vc.hidesBottomBarWhenPushed = YES; [self.navigationController pushViewController:vc animated:YES];
}