2019-03-21

day4:

photos:

图1

Shared Photo Library：

Requesting Authorization to Access Photos//Prepare your app to ask for permission when accessing the user's photo library.请求权限

class PHPhotoLibrary//A shared object that manages access and changes to the user’s shared photo library.

Asset Retrieval:

Fetching Objects and Requesting Changes//Get assets, asset collections, and collection lists matching a specified query.

class PHAsset//A representation of an image, video, or Live Photo in the Photos library.

class PHAssetCollection//A representation of a Photos asset grouping, such as a moment, user-created album, or smart album.

class PHCollection//The abstract superclass for Photos asset collections and collection lists.

class PHCollectionList//A group containing Photos asset collections, such as Moments, Years, or folders of user-created albums.

class PHObject//The abstract superclass for Photos model objects (assets and collections).

class PHFetchResult//An ordered list of assets or collections returned from a Photos fetch method.

class PHFetchOptions//A set of options that affect the filtering, sorting, and management of results that Photos returns when you fetch asset or collection objects.

Asset Loading:

Loading and Caching Assets and Thumbnails//Request image, video, or Live Photos content, and cache for quick reuse.

class PHImageManager//An object that facilitates retrieving or generating preview thumbnails and asset data.

class PHCachingImageManager//An object that facilitates retrieving or generating preview thumbnails, optimized for batch preloading large numbers of assets.

class PHImageRequestOptions//A set of options affecting the delivery of still image representations of Photos assets you request from an image manager.

class PHVideoRequestOptions//A set of options affecting the delivery of video asset data that you request from an image manager.

class PHLivePhotoRequestOptions//A set of options affecting the delivery of Live Photo assets you request from an image manager.

Live Photos:

Displaying Live Photos//Provide the same interactive playback of Live Photos as in the iOS Photos app.

class PHLivePhotoView//A view that displays a Live Photo—a picture that also includes motion and sound from the moments just before and after its capture.

class PHLivePhoto//A displayable representation of a Live Photo—a picture that includes motion and sound from the moments just before and after its capture.

Asset Resource Management:

class PHAssetResource//An underlying data resource associated with a photo, video, or Live Photo asset in the Photos library.

class PHAssetCreationRequest//A request to create a new Photos asset from underlying data resources, for use in a photo library change block.

class PHAssetResourceCreationOptions//A set of options affecting the creation of a new Photos asset from underlying resources.

class PHAssetResourceManager//A resource manager for the data storage underlying a Photos asset.

class PHAssetResourceRequestOptions//A set of options affecting the delivery of underlying asset data that you request from the asset resource manager.

Photo Editing Extensions:

Creating Photo Editing Extensions//Allow your app to edit assets directly within the Photos app.

protocol PHContentEditingController//A protocol your custom view controller class implements to provide a user interface for your Photos extension.

class PHEditingExtensionContext//An object that provides Photos editing extensions with access to the underlying project and photo library.