A UICollectionViewFlowLayout subclass that scales items to take up space, optimized for large item set, inspired by NHBalancedFlowLayout.

###UICollectionViewScrollDirectionVertical ###UICollectionViewScrollDirectionHorizontal

You can install ZLBalancedFlowLayout through CocoaPods adding the following to your Podfile:

pod 'ZLBalancedFlowLayout'

CocoaPods' support for swift is still pre-released, and requires your iOS deployment target to be 8.0 or later:

[sudo] gem install cocoapods --pre

Checkout the demo app for an example.

ZLBalancedFlowLayout supports all properties of UICollectionViewFlowLayout and the corresponding delegate methods, including minimumLineSpacing, minimumInteritemSpacing, sectionInset, etc.

Use rowHeight to adjust the item height.

/// The ideal row height of items in the grid
var rowHeight = CGFloat(100)

/// The option to enforce the ideal row height by changing the aspect ratio of the item if necessary.
var enforcesRowHeight = false

ZLBalancedFlowLayout uses dynamic programming techniques to find the optimal partition of cells upfront. The benchmarks are based on timings of prepareLayout:

###iPhone 6

###iOS simulator

• iOS 6 or higher.
• Automatic Reference Counting (ARC).

ZLBalancedFlowLayout is available under MIT license. See the LICENSE file for more info.

The photos in the demo app are selected from National Geographic

• Bodybuilders
• Fair Day’s End
• The Lookout
• Gray Langur at Rest
• Horses in the Highlands
• Incoming Flight
• Leaps and Bounds
• Those Lion Eyes
• In for a Treat
• Napoleon Invasion
• Turtle Power
• Home to Roost
• Seal Dive
• Bird Bank
• Cold Encounter
• Big and Little Dipper
• Call of the Wild
• Where the Antelope Play
• Swimming for Supper
• 50 Shades of Ray
• Croc Tail
• Tip of the Iguana
• North Star
• Tree Pose
• Winter Layers
• Huffing Puffins
• The Elegance of the Egret
• Here Be Dragons
• Walrus Interrupted
• Crying Wolves-