HTWaterfallFlow

一种瀑布流布局方式，用作collectionView的layout。

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Usage

// ViewController.m

#import "HTWaterfallFlowLayout.h"

HTWaterfallFlowLayout *waterfall = [[HTWaterfallFlowLayout alloc] initWithColumnCount:2];
[waterfall setColumnSpacing:10 rowSpacing:10 sectionInset:UIEdgeInsetsMake(10, 10, 10, 10)];
[waterfall setItemHeightBlock:^CGFloat(CGFloat itemWidth, NSIndexPath *indexPath) {
    // 返回计算后的高度
    return itemHeight;
}];

// 作为collectionView的layout
self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:waterfall];