DDCollectionViewFlowLayout 1.1

DDCollectionViewFlowLayout 1.1

测试已测试
语言语言 Obj-CObjective C
许可证 MIT
发布最后发布2018年3月

DeJohn Dong维护。



  • 作者:
  • DeJohn Dong

这是一个实现瀑布流效果的 CollectionViewFlowLayout,它还支持多节。
您可以自定义头部和尾部,也可以自定义 UICollectionViewCell。
现在,在 0.5 版本中,您可以在滑动 collectionView 时设置 header 保持在顶部。

##效果请点击此链接查看效果一
请点击此链接查看效果二

##安装

或者,您可以直接将文件从 DDCollectionViewFlowLayout / Classes 拖拽到您的项目中。

使用方法

要运行示例项目,请先克隆仓库,然后从项目目录中运行 pod install

1.示例:类似微信照片墙效果

    DDCollectionViewFlowLayout *layout = [[DDCollectionViewFlowLayout alloc] init];
    layout.delegate = self;
    layout.enableStickyHeaders = YES; //set the header sticky if you want
    [self.collectionView setCollectionViewLayout:layout];
    

实现 DDCollectionViewDelegateFlowLayout & UICollectionViewDataSource @required 或 @optional 方法

DDCollectionViewDelegateFlowLayout 继承自 UICollectionViewDelegateFlowLayout 协议。

代码

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return [[dataDict allKeys] count];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    sortedArray = [[dataDict allKeys] sortedArrayUsingSelector:@selector(compare:)];
    return [dataDict[sortedArray[section]] count];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView layout:(DDCollectionViewFlowLayout *)layout numberOfColumnsInSection:(NSInteger)section{
    return 4;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    PhotoCell *cell = (PhotoCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"PhotoCell" forIndexPath:indexPath];
    NSURL *url = dataDict[sortedArray[indexPath.section]][indexPath.row];
    [_assetLibrary assetForURL:url
                   resultBlock:^(ALAsset *asset) {
                       [cell.photo setImage:[UIImage imageWithCGImage:asset.thumbnail]];
                   }
                  failureBlock:^(NSError *error) {
                  }];
    return cell;
}

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{
    if(kind == UICollectionElementKindSectionHeader){
        UICollectionReusableView *header = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"header" forIndexPath:indexPath];
//        header.backgroundColor = [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.5f];
        UILabel *lblTitle = (UILabel *)[header viewWithTag:2];
        lblTitle.text = sortedArray[indexPath.section];
        return header;
    }
    return nil;
}

#pragma mark - UICollectionView Delegate Methods

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
    return 1;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{
    return 1;
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
    return UIEdgeInsetsMake(1, 1, 1, 1);
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    return CGSizeMake(80, 80);
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section{
    return CGSizeMake(self.view.bounds.size.width, 30);
}

2.示例:瀑布流效果

示例代码

#pragma mark - UICollectionView DataSource Methods

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

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

- (NSInteger)collectionView:(UICollectionView *)collectionView layout:(DDCollectionViewFlowLayout *)layout numberOfColumnsInSection:(NSInteger)section{
    return 3;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    WaterfallCell *cell = (WaterfallCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"PhotoCell" forIndexPath:indexPath];
    ALAsset *set = dataList[indexPath.item];
    [cell.photo setImage:[UIImage imageWithCGImage:set.thumbnail]];
    return cell;
}

#pragma mark - UICollectionView Delegate Methods

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
    return 5;
}

- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section{
    return 5;
}

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
    return UIEdgeInsetsMake(5, 5, 5, 5);
}

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    return CGSizeMake(100, 100 + indexPath.item % 20);
}

协议方法

- (NSInteger)collectionView:(UICollectionView *)collectionView layout:(DDCollectionViewFlowLayout *)layout numberOfColumnsInSection:(NSInteger)section;

DDCollectionViewDelegateFlowLayout 继承自 UICollectionViewDelegateFlowLayout 协议。所以您可以在 DDCollectionViewDelegateFlowLayout 中使用所有 UICollectionViewDelegateFlowLayout 协议的方法。

更新

  • 0.5 添加了 header 静止功能
  • 0.4 优化了 UI 代码

要求

  • Xcode 6
  • iOS 6.0

作者

DeJohn Dong, [email protected]

许可证

DDCollectionViewFlowLayout 在 MIT 许可证下可用。有关更多信息,请参阅 LICENSE 文件。