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AssetsLibraryについて (iOS5対応版)
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.
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AssetsLibraryについて (iOS5対応版)
- 1. AssetsLibrary (iOS5 ) itok@itok_twit 2011.10.22
- 2. • , itok, @itok_twit • • • iPhone
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- 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)
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- 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