UICollectionView的使用（补充）——大小间距

1、行间距

示例代码
1）协议方法实现

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 20;
}

2）UICollectionViewFlowLayout中minimumLineSpacing实现

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
flowLayout.minimumLineSpacing = 20; 

2、列间距

示例代码
1）协议方法实现

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
    return 10;
}

2）UICollectionViewFlowLayout中minimumInteritemSpacing实现

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
flowLayout.minimumInteritemSpacing = 10;

3、内容边距

示例代码
1）协议方法实现

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(10, 20, 10, 20);
}

2）UICollectionViewFlowLayout中sectionInset实现

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
flowLayout.sectionInset = UIEdgeInsetsMake(10, 10, 10, 10);

4、大小

示例代码
1）协议方法实现

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{   
    return CGSizeMake(100,120);
}

2）UICollectionViewFlowLayout中itemSize实现

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
flowLayout.itemSize = CGSizeMake(200, 80);