UICollectionView 及 UICollectionViewCell 复用

来源：互联网发布：潭州教育java 编辑：程序博客网时间：2024/06/06 05:17

1、创建：

UICollectionViewFlowLayout *flowLayout =[[UICollectionViewFlowLayoutalloc]init];

flowLayout.scrollDirection =UICollectionViewScrollDirectionVertical;

flowLayout.sectionInset =UIEdgeInsetsZero;

flowLayout.minimumInteritemSpacing =0;

flowLayout.minimumLineSpacing =5;

_collectionView =[[UICollectionViewalloc]initWithFrame:CGRectMake(0,0,self.view.width, [UIScreenmainScreen].bounds.size.height-65)collectionViewLayout:flowLayout];

2、cell复用：

[_collectionViewregisterClass:[ImagePickCollectionViewCellclass]forCellWithReuseIdentifier:cellId];

ImagePickCollectionViewCell *cell = [_collectionViewdequeueReusableCellWithReuseIdentifier:cellIdforIndexPath:indexPath];

3、代理：

#pragma mark ---- UICollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView

{

return1;

}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section

{

return_photos.count;

}

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

{

ImagePickCollectionViewCell *cell = [_collectionViewdequeueReusableCellWithReuseIdentifier:cellIdforIndexPath:indexPath];

cell.backgroundColor = [UIColorpurpleColor];

//ALAsset *asset = _photos[indexPath.row];

cell.imageView.image =_photos[indexPath.row];

return cell;

}

#pragma mark ---- UICollectionViewDelegateFlowLayout

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath

{

float wid =CGRectGetWidth(_collectionView.bounds);

returnCGSizeMake((wid -2*5)/3, (wid -2*5)/3);

}

4、注意：

cell 的 frame 不是以（0, 0）开头，添加子View时要注意，否则出现布局错乱。

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