IOS 瀑布流

CHTCollectionViewWaterfallLayout下载链接

 layout = [[CHTCollectionViewWaterfallLayout alloc] init];    layout.sectionInset = UIEdgeInsetsMake(0, 5, 5, 5);    layout.columnCount = 2;    layout.minimumInteritemSpacing = 5;    layout.minimumColumnSpacing = 5;    self.collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight-64－10) collectionViewLayout:layout];    self.collectionView.delegate = self;    self.collectionView.dataSource = self;    self.collectionView.backgroundColor = [UIColor whiteColor];    [self.collectionView registerNib:[UINib nibWithNibName:@"WaterViewCell" bundle:nil] forCellWithReuseIdentifier:@"WaterViewCell"];    [_collectionView registerClass:[UICollectionReusableView class] forSupplementaryViewOfKind:CHTCollectionElementKindSectionHeader withReuseIdentifier:MYHeader];//保持一直可滑动    self.collectionView.alwaysBounceVertical = YES;    [self.view addSubview:self.collectionView];

#pragma mark - UICollectionView Delegate//获取每组返回几个数据- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {        return _dataArr.count;    }//获取返回几组- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{    return 1;}//- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {        WaterViewCell *cell = (WaterViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:@"WaterViewCell"                                                                                     forIndexPath:indexPath];        if (indexPath.row<_dataArr.count) {                WaterModel *model = [_dataArr objectAtIndex:indexPath.row];        cell.model = model;                //设置图片的高度        [cell.imageView sd_setImageWithURL:[NSURL URLWithString:urlStr] placeholderImage:[UIImage imageNamed:@"ls_AdDefaultImage.png"] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {            if (image) {                //宽高比                CGFloat x = image.size.width/image.size.height;                CGFloat cellHeight = ((screenWidth-30)/2)/x;                                if (cell.model.imageSize.height!=cellHeight) {                    model.imageSize = CGSizeMake((screenWidth-30)/2, cellHeight);                    //刷新时不让屏幕闪光                    [UIView performWithoutAnimation:^{                        [_collectionView reloadSections:[NSIndexSet indexSetWithIndex:0]];                    }];                }            }        }];    }        return cell;    }#pragma mark - CHTCollectionViewDelegateWaterfallLayout- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {        if (indexPath.row<_dataArr.count) {                WaterModel *model = [_dataArr objectAtIndex:indexPath.row];                if (model.imageSize.height!=0) {            return model.imageSize;        }        return CGSizeMake((screenWidth-30)/2, 0);    }        return CGSizeZero;    }