UICollectionView創建我們可以通過多種辦法來實現了下面來看一段使用純代碼實現的UICollectionView例子，具體的如下文所示。

1.創建自定義UICollectionViewCell

選中工程，右鍵-New File…選擇“Cocoa Touch Class”-Next，選擇繼承於UICollectionViewCell類，給個合理的名稱CollectionViewCell，再Next完成。

1創建

在UICollectionViewCell中定義你所需要的控件

//圖片
@property(strong,nonatomic)UIImageView *fruitImage;
//標題
@property(strong,nonatomic)UILabel *fruitTitle;
//價格
@property(strong,nonatomic)UILabel *priceLabel;

在UICollectionViewCell.m文件中重寫

-(instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        _fruitImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth/2-1 , kScreenHeight/3.4)];
        _fruitImage.image = [UIImage imageNamed:@"pic_fruit"];
        [self.contentView addSubview:_fruitImage];
        
        _fruitTitle = [[UILabel alloc]initWithFrame:CGRectMake(7, kScreenHeight/3.4 , kScreenWidth/2-6, 50)];
        _fruitTitle.numberOfLines = 0;
        _fruitTitle.font = [UIFont systemFontOfSize:13];
        _fruitTitle.textColor = [UIColor grayColor];
        [self.contentView addSubview:_fruitTitle]; 
    }
     return self;
}

2.在ViewController.m文件中創建UICollectionView實例

//創建collectionView
-(void)creatCollectionView{
    //1.初始化layout
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    //設置collectionView滾動方向
    //    [layout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
    //設置headerView的尺寸大小
    //    layout.headerReferenceSize = CGSizeMake(kScreenWidth, 100);
    //該方法也可以設置itemSize
    //    layout.itemSize =CGSizeMake(0, 150);
    
    //2.初始化collectionView
    mainCollectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, kScreenHeight /1.1, kScreenWidth, kScreenHeight*1.6) collectionViewLayout:layout];
    [self.upDownScrollView addSubview:mainCollectionView];
    mainCollectionView.backgroundColor = [UIColor colorWithRed:235/255.0 green:235/255.0 blue:235/255.0 alpha:1];
    
    //3.注冊collectionViewCell
    //注意，此處的ReuseIdentifier 必須和 cellForItemAtIndexPath 方法中 一致 均為 cellId
    [mainCollectionView registerClass:[FruitCollectionViewCell class] forCellWithReuseIdentifier:@"cellId"];
    
    //    //注冊headerView  此處的ReuseIdentifier 必須和 cellForItemAtIndexPath 方法中 一致  均為reusableView
    //    [mainCollectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"reusableView"];
    
    //4.設置代理
    mainCollectionView.delegate = self;
    mainCollectionView.dataSource = self;
 
}

3.實現UICollectionView代理方法

#pragma mark collectionView代理方法
//返回section個數
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
    return 1;
}
 
//每個section的item個數
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    return 6;
}
 
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    
    FruitCollectionViewCell *cell = (FruitCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"cellId" forIndexPath:indexPath];
    
 
    
    if (indexPath.section == 0 && indexPath.row == 1 ) {
        cell.fruitTitle.text = @"正宗台灣產高雄特產熱帶香蕉好吃包郵123";
 
    }else{
        cell.fruitTitle.text = @"火爆進口馬來西亞特產大金龍芒果包郵500g";
    }
    
 
    cell.backgroundColor = [UIColor whiteColor];
    return cell;
}
 
//設置每個item的尺寸
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(kScreenWidth/2-4, kScreenHeight/2.5);
 
}
 
//footer的size
//- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForFooterInSection:(NSInteger)section
//{
//    return CGSizeMake(10, 10);
//}
 
//header的size
//- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
//{
//    return CGSizeMake(10, 10);
//}
 
//設置每個item的UIEdgeInsets
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
    return UIEdgeInsetsMake(0, 2, 0, 2);
}
 
//設置每個item水平間距
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
    return 2;
}
 
 
//設置每個item垂直間距
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
    return 5;
}
 
 
//通過設置SupplementaryViewOfKind 來設置頭部或者底部的view，其中 ReuseIdentifier 的值必須和 注冊是填寫的一致，本例都為 “reusableView”
//- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath
//{
//    UICollectionReusableView *headerView = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"reusableView" forIndexPath:indexPath];
//    headerView.backgroundColor =[UIColor grayColor];
//    UILabel *label = [[UILabel alloc] initWithFrame:headerView.bounds];
//    label.text = @"這是collectionView的頭部";
//    label.font = [UIFont systemFontOfSize:20];
//    [headerView addSubview:label];
//    return headerView;
//}
 
//點擊item方法
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    FruitCollectionViewCell *cell = (FruitCollectionViewCell *)[collectionView cellForItemAtIndexPath:indexPath];
    NSString *msg = cell.fruitTitle.text;
    NSLog(@"%@",msg);
}

看到這裡相信你已經掌握了UICollectionView的使用方法啦