The document discusses the AssetsLibrary framework in iOS 5 which allows accessing and modifying photos and videos that are stored in the users photo library. Key points include: - The AssetsLibrary framework provides APIs for browsing, loading, and saving images and asset metadata. - Assets are organized into groups and can be represented using ALAsset and ALAssetRepresentation classes. - iOS 5 adds capabilities for editing asset metadata like date and location as well as writing modified image data back to the photo library. - Notifications are provided when changes are made to the photo library through other applications or services.

1. AssetsLibrary
(iOS5 )
itok@itok_twit
2011.10.22

2. • , itok, @itok_twit
•
•
• iPhone

4. Book+

5. SmartTub

7. PictShare

8. iPicture

9. AssetsLibrary

10. AssetsLibrary
•iPhone/iPad

11. ImagePicker
•EXIF
•
•

12. •

13. Assets
•
•

14. ALAssetsLibrary
ALAssetsGroup
ALAsset Asset
ALAssetRepresentat
ion

15. ALAssetsLibrary ALAssetsGroup
group type
URL enumeration
ALAsset
representation
ALAssetRepresentat
ion

16. ALAsset
•property
•date
•
•iOS4 : ≠
•iOS5 : EXIF
•location
•thumbnail square: 75px
•iOS5 : aspectRatioThumbnail

17. ALAssetRepresentation
•metadata
•CGImage
•iOS5 : fullScreenImage
•URL (assets-library://)
•iOS4 :
•iOS5 : GUID
•
• (iOS5)

18. •
•ALAssetsLibraryChangedNotification

19. iOS5 1
• API
•
• asset

20. iOS5 2
• API
•writeModifiedImageDataToSavedPhotosAlbum:
metadata:completionBlock
• asset asset
originalAsset
•EXIF date property
•setImageData:metadata:completionBlock
•writeModified... asset
asset ←editable

21. iOS5
•ALAssetsLibraryChangedNotification
•writeImageDataToSavedPhotosAlbum:metadata:
completeBlock: API
•Aperture
ALAssetPropertyDate
•
Apple

22. • iOS4
•iOS5