UICollectionViewController的使用

@interface UICollectionViewController : UIViewController <UICollectionViewDelegate, UICollectionViewDataSource>

使用步骤

UICollectionViewFlowLayout *collectionViewLayout = [[UICollectionViewFlowLayout alloc]init];
[collectionViewLayout setMinimumLineSpacing:10];//垂直间距
[collectionViewLayout setMinimumInteritemSpacing:1];//水平间距
[collectionViewLayout setItemSize:CGSizeMake(75, 75)];
//设置分组内边距
UIEdgeInsets insets = UIEdgeInsetsMake(10, 0, 0, 0);
[collectionViewLayout setSectionInset:(insets)];
self = [super initWithCollectionViewLayout:collectionViewLayout];

// Register cell classes  for use in creating new collection view cells.
// [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];
UINib *nib = [UINib nibWithNibName:@"HLProductCellCollectionViewCell" bundle:nil];
[self.collectionView registerNib:nib forCellWithReuseIdentifier:reuseIdentifier];

1)'NSInvalidArgumentException', reason: 'UICollectionView must be initialized with a non-nil layout parameter'
[HLProductCollectionViewController alloc]initWithCollectionViewLayout:( UICollectionViewLayout*)