ios - varias - ¿Guardar imágenes con phimagemanager en un álbum personalizado?

icloud para windows

Question

Estoy creando una aplicación que toma imágenes con AVFoundation y quiero guardarlas en un álbum personalizado que luego puedo consultar y mostrar en mi aplicación. (Preferiría no tenerlos en el rollo general de fotos, a menos que el usuario lo quiera). Realmente no puedo encontrar nada que muestre cómo hacerlo en Swift ... o en absoluto. ¿Hay alguna otra manera en que se supone que debo hacer esto?

Encontré este ejemplo en SO, pero no tiene sentido para mí y no puedo hacerlo funcionar.

    func savePhoto() {
    var albumFound : Bool = false
    var assetCollection: PHAssetCollection!
    var photosAsset: PHFetchResult!
    var assetThumbnailSize:CGSize!

    // Create the album if does not exist (in viewDidLoad)
    if let first_Obj:AnyObject = collection.firstObject{
        //found the album
        self.albumFound = true
        self.assetCollection = collection.firstObject as PHAssetCollection
    }else{
        //Album placeholder for the asset collection, used to reference collection in completion handler
        var albumPlaceholder:PHObjectPlaceholder!
        //create the folder
        NSLog("/nFolder /"%@/" does not exist/nCreating now...", albumName)
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let request = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle(albumName)
            albumPlaceholder = request.placeholderForCreatedAssetCollection
            },
            completionHandler: {(success:Bool, error:NSError!)in
                NSLog("Creation of folder -> %@", (success ? "Success":"Error!"))
                self.albumFound = (success ? true:false)
                if(success){
                    let collection = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([albumPlaceholder.localIdentifier], options: nil)
                    self.assetCollection = collection?.firstObject as PHAssetCollection
                }
        })
    }



    let bundle = NSBundle.mainBundle()
    let myFilePath = bundle.pathForResource("highlight1", ofType: "mov")
    let videoURL:NSURL = NSURL.fileURLWithPath(myFilePath!)!

    let priority = DISPATCH_QUEUE_PRIORITY_DEFAULT
    dispatch_async(dispatch_get_global_queue(priority, 0), {
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            //let createAssetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage
            let createAssetRequest = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(videoURL)
            let assetPlaceholder = createAssetRequest.placeholderForCreatedAsset
            let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection, assets: self.photosAsset)
            albumChangeRequest.addAssets([assetPlaceholder])
            }, completionHandler: {(success, error)in
                dispatch_async(dispatch_get_main_queue(), {
                    NSLog("Adding Image to Library -> %@", (success ? "Sucess":"Error!"))
                    //picker.dismissViewControllerAnimated(true, completion: nil)
                })
        })

    })
}

¡Cualquier ayuda / explicación sería genial!

Answer 1

Así es como lo hago:

En la cima:

import Photos

var image: UIImage!
var assetCollection: PHAssetCollection!
var albumFound : Bool = false
var photosAsset: PHFetchResult!
var assetThumbnailSize:CGSize!
var collection: PHAssetCollection!
var assetCollectionPlaceholder: PHObjectPlaceholder!

Creando el álbum:

func createAlbum() {
    //Get PHFetch Options
    let fetchOptions = PHFetchOptions()
    fetchOptions.predicate = NSPredicate(format: "title = %@", "camcam")
    let collection : PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(.Album, subtype: .Any, options: fetchOptions)
    //Check return value - If found, then get the first album out
    if let _: AnyObject = collection.firstObject {
        self.albumFound = true
        assetCollection = collection.firstObject as! PHAssetCollection
    } else {
        //If not found - Then create a new album
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let createAlbumRequest : PHAssetCollectionChangeRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle("camcam")
            self.assetCollectionPlaceholder = createAlbumRequest.placeholderForCreatedAssetCollection
            }, completionHandler: { success, error in
                self.albumFound = success

                if (success) {
                    let collectionFetchResult = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([self.assetCollectionPlaceholder.localIdentifier], options: nil)
                    print(collectionFetchResult)
                    self.assetCollection = collectionFetchResult.firstObject as! PHAssetCollection
                }
        })
    }
}

Al guardar la foto:

func saveImage(){
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromImage(self.image)
            let assetPlaceholder = assetRequest.placeholderForCreatedAsset
            let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.assetCollection, assets: self.photosAsset)
            albumChangeRequest!.addAssets([assetPlaceholder!])
            }, completionHandler: { success, error in
                print("added image to album")
                print(error)

                self.showImages()
        })
    }

Mostrando las imágenes de ese álbum:

func showImages() {
        //This will fetch all the assets in the collection

        let assets : PHFetchResult = PHAsset.fetchAssetsInAssetCollection(assetCollection, options: nil)
        print(assets)

        let imageManager = PHCachingImageManager()
        //Enumerating objects to get a chached image - This is to save loading time
        assets.enumerateObjectsUsingBlock{(object: AnyObject!,
            count: Int,
            stop: UnsafeMutablePointer<ObjCBool>) in

            if object is PHAsset {
                let asset = object as! PHAsset
                print(asset)

                let imageSize = CGSize(width: asset.pixelWidth, height: asset.pixelHeight)

                let options = PHImageRequestOptions()
                options.deliveryMode = .FastFormat

                imageManager.requestImageForAsset(asset, targetSize: imageSize, contentMode: .AspectFill, options: options, resultHandler: {(image: UIImage?,
                    info: [NSObject : AnyObject]?) in
                    print(info)
                    print(image)
                })
            }
        }

Answer 2

Como se actualizó para Swift 2.1+ y para Video en caso de que intente hacer eso y termine aquí. Compare las otras respuestas con ligeras diferencias (como usar imágenes en lugar de videos)

var photosAsset: PHFetchResult!
var collection: PHAssetCollection!
var assetCollectionPlaceholder: PHObjectPlaceholder!

//Make sure we have custom album for this app if haven''t already
let fetchOptions = PHFetchOptions()
fetchOptions.predicate = NSPredicate(format: "title = %@", "MY_APP_ALBUM_NAME")
self.collection = PHAssetCollection.fetchAssetCollectionsWithType(.Album, subtype: .Any, options: fetchOptions).firstObject as! PHAssetCollection

//if we don''t have a special album for this app yet then make one
if self.collection == nil {
     PHPhotoLibrary.sharedPhotoLibrary().performChanges({
        let createAlbumRequest : PHAssetCollectionChangeRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle("MY_APP_ALBUM_NAME")
        self.assetCollectionPlaceholder = createAlbumRequest.placeholderForCreatedAssetCollection
             }, completionHandler: { success, error in
                if success {
                    let collectionFetchResult = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([self.assetCollectionPlaceholder.localIdentifier], options: nil)
                    print(collectionFetchResult)
                    self.collection = collectionFetchResult.firstObject as! PHAssetCollection
                }
            })
 }

//save the video to Photos                     
PHPhotoLibrary.sharedPhotoLibrary().performChanges({
     let assetRequest = PHAssetChangeRequest.creationRequestForAssetFromVideoAtFileURL(self.VIDEO_URL_FOR_VIDEO_YOU_MADE!)
     let assetPlaceholder = assetRequest!.placeholderForCreatedAsset
     self.photosAsset = PHAsset.fetchAssetsInAssetCollection(self.collection, options: nil)
     let albumChangeRequest = PHAssetCollectionChangeRequest(forAssetCollection: self.collection, assets: self.photosAsset)
     albumChangeRequest!.addAssets([assetPlaceholder!])
         }, completionHandler: { success, error in
               if success {
                  print("added video to album")
               }else if error != nil{
                  print("handle error since couldn''t save video")
               }
         }
 })

Answer 3

Me gusta volver a utilizar el código que escribo, así que decidí crear una extensión para PHPhotoLibrary, donde es posible usarla como:

PHPhotoLibrary.saveImage(photo, albumName: "Trip") { asset in
    guard let asset = asset else {
        assert(false, "Asset is nil")
        return
    }
    PHPhotoLibrary.loadThumbnailFromAsset(asset) { thumbnail in
        print(thumbnail)
    }
}

Aquí está el código: https://gist.github.com/ricardopereira/636ccd0a3c8a327c43d42e7cbca4d041

Answer 4

Mejoré el código de @ricardopereira y @ColossalChris. Se agregó video a la extensión y se agregó otra extensión sobre PHAsset para eliminar los errores de compilación. Funciona en veloz 2.1. Uso de muestra:

#import "Yourtargetname-Swift.h"//important!

NSURL *videoURL = [[NSURL alloc] initFileURLWithPath:PATH_TO_VIDEO];


[PHPhotoLibrary saveVideo:videoURL albumName:@"my album" completion:^(PHAsset * asset) {
    NSLog(@"success");
    NSLog(@"asset%lu",(unsigned long)asset.pixelWidth);


}];

Importe ambos archivos rápidos: github.com/kv2/PHPhotoLibrary-PhotoAsset.swift

Se puede usar en Object-c siempre que importe el encabezado rápido para su destino (consulte el archivo ViewController.m ).

Answer 5

Responda en Objective-C y limpie un poco.

__block PHFetchResult *photosAsset;
__block PHAssetCollection *collection;
__block PHObjectPlaceholder *placeholder;

// Find the album
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.predicate = [NSPredicate predicateWithFormat:@"title = %@", @"YOUR_ALBUM_TITLE"];
collection = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum
                                                      subtype:PHAssetCollectionSubtypeAny
                                                      options:fetchOptions].firstObject;
// Create the album
if (!collection)
{
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        PHAssetCollectionChangeRequest *createAlbum = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"YOUR_ALBUM_TITLE"];
        placeholder = [createAlbum placeholderForCreatedAssetCollection];
    } completionHandler:^(BOOL success, NSError *error) {
        if (success)
        {
            PHFetchResult *collectionFetchResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[placeholder.localIdentifier]
                                                                                                            options:nil];
            collection = collectionFetchResult.firstObject;
        }
    }];
}

// Save to the album
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetChangeRequest *assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[UIImage imageWithData:imageData]];
    placeholder = [assetRequest placeholderForCreatedAsset];
    photosAsset = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
    PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection
                                                                                                                  assets:photosAsset];
    [albumChangeRequest addAssets:@[placeholder]];
} completionHandler:^(BOOL success, NSError *error) {
    if (success)
    {
        NSString *UUID = [placeholder.localIdentifier substringToIndex:36];
        self.photo.assetURL = [NSString stringWithFormat:@"assets-library://asset/asset.PNG?id=%@&ext=JPG", UUID];
        [self savePhoto];
    }
    else
    {
        NSLog(@"%@", error);
    }
}];

El bit al final con el UUID fue algo que encontré en otro hilo de para crear un reemplazo para la propiedad AssetURL de un ALAsset.

Nota: Vea el comentario de Chris a continuación para una respuesta más completa.