Ios 从另一个.xib文件更改UICollectionView单元格的属性？

我使用的是UICollectionView，并且在CollectionView之外添加了另一个名为CollectionItemView的.xib文件。为了在CollectionView中显示我的CollectionItemView，我使用了以下命令：

[self.collectionViewPack registerNib:[UINib nibWithNibName:@"CollectionViewItem" bundle:nil] 

forCellWithReuseIdentifier:kCellReuseIdentifier];
self.collectionViewPack.backgroundColor = [UIColor whiteColor];

[super viewDidLoad];


UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setItemSize:CGSizeMake(150, 250)];
[flowLayout setSectionInset:UIEdgeInsetsMake(5, 5, 5, 5)];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
[self.collectionViewPack setCollectionViewLayout:flowLayout];
[self.collectionViewPack setAllowsSelection:YES];
self.collectionViewPack.delegate=self;

现在，我在interface builder的CollectionViewItem单元格中添加了一些标签和文本视图。如何调用这些属性以对其进行更改，从而为其赋值？以下是UICollectionView的my viewDidLoad中的其余代码：

[self.collectionViewPack registerNib:[UINib nibWithNibName:@"CollectionViewItem" bundle:nil] 

forCellWithReuseIdentifier:kCellReuseIdentifier];
self.collectionViewPack.backgroundColor = [UIColor whiteColor];

[super viewDidLoad];


UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setItemSize:CGSizeMake(150, 250)];
[flowLayout setSectionInset:UIEdgeInsetsMake(5, 5, 5, 5)];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
[self.collectionViewPack setCollectionViewLayout:flowLayout];
[self.collectionViewPack setAllowsSelection:YES];
self.collectionViewPack.delegate=self;