collectionView纯代码使用

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collectionView和tableView最大的不同之处就是需要自定义cell,所以第一步自定义collectionViewCell

1.自定义collection

//初始化layout
    UICollectionViewFlowLayout*flowLayout =[[UICollectionViewFlowLayoutalloc]init];
    // 2.设置每个格子的尺寸
    flowLayout.itemSize= CGSizeMake(90,90);

    // 3.设置整个collectionView的内边距

    CGFloat paddingY = 20;

    CGFloat paddingX = 20;

    flowLayout.sectionInset= UIEdgeInsetsMake(paddingY, paddingX, paddingY, paddingX);

    // 4.设置每一行之间的间距
    flowLayout.minimumLineSpacing= paddingY;
//    flowLayout.headerReferenceSize = CGSizeMake(SCREENWIDTH, 50);//设置headerView的尺寸大小
    [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];//设置滚动方向
    //初始化ConllectionView
    _commonConllectionView= [[UICollectionViewalloc]initWithFrame:CGRectMake(0,0,SCREENWIDTH,SCREENHEIGHT)collectionViewLayout:flowLayout];
    //注册单元格
    [_commonConllectionViewregisterClass:[WCRCommonCollectionViewCellclass]forCellWithReuseIdentifier:@"commonCollectionCell"];

// _commonConllectionView

//注册headerView 此处的ReuserIdentifier 必须和 cellForItemAtIndexPath 方法中一致

[_commonConllectionView registerClass:[*** class] forSupplementaryViewOfKind:UICollectionElementKindSectionHeader withTeuseIdentifier @“reuableView”];

    //设置代理
    _commonConllectionView.delegate= self;
    _commonConllectionView.dataSource= self;
    _commonConllectionView.backgroundColor= [UIColorwhiteColor];

[self.view addSubview:_commonConllectionView];

2.实现3个代理 DataSource,Delegate,DelegateFlowLayout

3.实现代理方法

-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView*)collectionView
{
return 1;
}

-(NSInteger)collectionView:(UICollectionView*)collectionView numberOfItemsInSection:(NSInteger)section{
return _commonConllectionArray.count;
}

//定义每个UICollectionView的大小
- (CGSize)collectionView:(UICollectionView*)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath*)indexPath

{

return CGSizeMake(100,100);
}

-(UICollectionViewCell*)collectionView:(UICollectionView*)collectionView cellForItemAtIndexPath:(NSIndexPath*)indexPath{

WCRCommonCollectionViewCell *cell = (WCRCommonCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"commonCollectionCell" forIndexPath:indexPath];

cell.commonInfo= _commonConllectionArray[indexPath.row];
return cell;

}

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