v2.3.0

• #29 Add "hold to preview" feature (Finally!)
• #32 Fix showing "No photos" view issue even there are photos in album
• #35 Fix showing supplementary view issue when there are no assets in the album
• #38 Add shouldShowAsset delegate method
• #39 Add showsNumberOfAssets property
• #40 Change the picker to a container view controller rather than a navigation controller.
• #41 Add "show default content" feature
• Make assets group cell to opaque to increase scrolling performance
• Add accessibility label to the auxiliary view

v2.2.2

• Fix issue of removing notifications from the same thread

v2.2.1

• #33 Rectify the delegate method name shouldEnableAsset in the sample app and README.md

v2.2.0

• #30 Refactor into separate files

v2.1.0

• #28 Disable "Done" Button if no assets are selected
• Change "Done" Button style to UIBarButtonItemStyleDone

v2.0.0

• Rename the delegate methods to more sensible one
• Replace certain properties with delegate methods in order to provide more flexibility
• Selected assets are preserved across albums
• Move title of selected assets to toolbar
• Show "no assets" view on empty albums
• Make "no assets" message to be more graceful, reflecting the device's model and camera feature
• Update padlock image to iOS 7 style
• Monitor ALAssetsLibraryChangedNotification and reload corresponding view controllers
• Use KVO to monitor the change of selected assets
• Add: Empty assets placeholder image
• Add: Selected assets property
• Add: Selected assets changed notification
• Add: Selection methods
• Add: iPad demo
• Add: Appledoc documentation
• Fix: Footer is not centre aligned after rotation
• Fix: Collection view layout issue on iPad landscape mode
• Fix: Collection view not scrolling to bottom on load
• Refactor certain methods