iPhone - How to create a custom album and give cus

问题:

I am developing an iPhone photo application, so i need to create a separate album with a name "My Album" in camera roll and i need to save my UIImageView image with custom name for example "My Image.png" inside the newly created directory.

How can i do this?

回答1:

You can create a custom album and add an image pretty easy with these lines of code in iOS:

// Create the new album.
__block PHObjectPlaceholder *myAlbum;
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetCollectionChangeRequest *changeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title];
    myAlbum = changeRequest.placeholderForCreatedAssetCollection;
} completionHandler:^(BOOL success, NSError *error) {
    if (success) {
        PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[myAlbum.localIdentifier] options:nil];
        PHAssetCollection *assetCollection = fetchResult.firstObject;

        [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
            PHAssetChangeRequest *assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

            // add asset
            PHAssetCollectionChangeRequest *assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
            [assetCollectionChangeRequest addAssets:@[[assetChangeRequest placeholderForCreatedAsset]]];
        } completionHandler:^(BOOL success, NSError *error) {
            if (!success) {
                NSLog(@"Error: %@", error);
            }
        }];
    } else {
        NSLog(@"Error: %@", error);
    }
}];

回答2:

Since the AssetsLibrary is deprecated, please use the Photos framework instead (iOS 8 and later).

// Deprecated!
import AssetsLibrary

// Swift 3.0
let assetsLibrary = ALAssetsLibrary()
assetsLibrary.addAssetsGroupAlbum(withName: "NewAlbum", resultBlock: { assetsGroup in
    print(assetsGroup == nil ? "Already created" : "Success")
}, failureBlock: { error in
    print(error)
})

You can use the shared PHPhotoLibrary object to create new photos but you can't give them specific names because you will be working with assets that need to be managed by the Photos.app. Each asset has specific properties. You can fetch objects, request changes, asset/thumbnail loading and caching, etc.

To create a custom album, please use the PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle:).

Brief example:

// Swift 3.0
func createPhotoLibraryAlbum(name: String) {
    var albumPlaceholder: PHObjectPlaceholder?
    PHPhotoLibrary.shared().performChanges({
        // Request creating an album with parameter name
        let createAlbumRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: name)
        // Get a placeholder for the new album
        albumPlaceholder = createAlbumRequest.placeholderForCreatedAssetCollection
    }, completionHandler: { success, error in
        if success {
            guard let placeholder = albumPlaceholder else {
                fatalError("Album placeholder is nil")
            }

            let fetchResult = PHAssetCollection.fetchAssetCollections(withLocalIdentifiers: [placeholder.localIdentifier], options: nil)
            guard let album: PHAssetCollection = fetchResult.firstObject else {
                // FetchResult has no PHAssetCollection
                return
            }

            // Saved successfully!
            print(album.assetCollectionType)
        }
        else if let e = error {
            // Save album failed with error
        }
        else {
            // Save album failed with no error
        }
    })
}

Don't forget to import Photos library.

To create a new photo asset on that album, please use the PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle:).

// Swift 3.0
func createPhotoOnAlbum(photo: UIImage, album: PHAssetCollection) {
    PHPhotoLibrary.shared().performChanges({
        // Request creating an asset from the image
        let createAssetRequest = PHAssetChangeRequest.creationRequestForAsset(from: photo)
        // Request editing the album
        guard let albumChangeRequest = PHAssetCollectionChangeRequest(for: album) else {
            // Album change request has failed
            return
        }
        // Get a placeholder for the new asset and add it to the album editing request
        guard let photoPlaceholder = createAssetRequest.placeholderForCreatedAsset else {
            // Photo Placeholder is nil
            return
        }
        albumChangeRequest.addAssets([photoPlaceholder] as NSArray)
    }, completionHandler: { success, error in
        if success {
            // Saved successfully!
        }
        else if let e = error {
            // Save photo failed with error
        }
        else {
            // Save photo failed with no error
        }
    })
}

UPDATE:

We need to request access to be able to use the Photos library:

PHPhotoLibrary.requestAuthorization { status in
     switch status {
     ...
}

As of iOS 10 and above we also need to add entry for access in the target .plist file for "Privacy - Photo Library Usage Description":

<key>NSPhotoLibraryUsageDescription</key>
<string>Access to photos is needed to provide app features</string>

回答3:

It was working from since iOS 5.0.
Please import AssetsLibrary/AssetsLibrary.h

ALAssetsLibrary* libraryFolder = [[ALAssetsLibrary alloc] init];
[libraryFolder addAssetsGroupAlbumWithName:@"My Album" resultBlock:^(ALAssetsGroup *group) 
{
    NSLog(@"Adding Folder:'My Album', success: %s", group.editable ? "Success" : "Already created: Not Success");
} failureBlock:^(NSError *error) 
{
    NSLog(@"Error: Adding on Folder");
}];

回答4:

Create a new album:

func createAlbum(withTitle title: String, completionHandler: @escaping (PHAssetCollection?) -> ()) {
    DispatchQueue.global(qos: .background).async {
        var placeholder: PHObjectPlaceholder?

        PHPhotoLibrary.shared().performChanges({
            let createAlbumRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle: title)
            placeholder = createAlbumRequest.placeholderForCreatedAssetCollection
        }, completionHandler: { (created, error) in
            var album: PHAssetCollection?
            if created {
                let collectionFetchResult = placeholder.map { PHAssetCollection.fetchAssetCollections(withLocalIdentifiers: [$0.localIdentifier], options: nil) }
                album = collectionFetchResult?.firstObject
            }

            completionHandler(album)
        })
    }
}

Get an album with with a specified name:

func getAlbum(title: String, completionHandler: @escaping (PHAssetCollection?) -> ()) {
    DispatchQueue.global(qos: .background).async { [weak self] in
        let fetchOptions = PHFetchOptions()
        fetchOptions.predicate = NSPredicate(format: "title = %@", title)
        let collections = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: fetchOptions)

        if let album = collections.firstObject {
            completionHandler(album)
        } else {
            self?.createAlbum(withTitle: title, completionHandler: { (album) in
                completionHandler(album)
            })
        }
    }
}

And save a photo to a Photos album:

func save(photo: UIImage, toAlbum titled: String completionHandler: @escaping (Bool, Error?) -> ()) {
    getAlbum(title: titled) { (album) in
        DispatchQueue.global(qos: .background).async {
            PHPhotoLibrary.shared().performChanges({
                let assetRequest = PHAssetChangeRequest.creationRequestForAsset(from: photo)
                let assets = assetRequest.placeholderForCreatedAsset
                    .map { [$0] as NSArray } ?? NSArray()
                let albumChangeRequest = album.flatMap { PHAssetCollectionChangeRequest(for: $0) }
                albumChangeRequest?.addAssets(assets)
            }, completionHandler: { (success, error) in
                completionHandler(success, error)
            })
        }
    }
}

回答5:

You can try My below Method for Create Album for iOS 7 and iOS 8

#define PHOTO_ALBUM_NAME @"AlbumName Videos"
-(void)createAlbum{

// PHPhotoLibrary_class will only be non-nil on iOS 8.x.x
Class PHPhotoLibrary_class = NSClassFromString(@"PHPhotoLibrary");

if (PHPhotoLibrary_class) {


    // iOS 8..x. . code that has to be called dynamically at runtime and will not link on iOS 7.x.x ...

    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:PHOTO_ALBUM_NAME];
    } completionHandler:^(BOOL success, NSError *error) {
        if (!success) {
            NSLog(@"Error creating album: %@", error);
        }else{
            NSLog(@"Created");
        }
    }];
}else{
    [self.library addAssetsGroupAlbumWithName:PHOTO_ALBUM_NAME resultBlock:^(ALAssetsGroup *group) {
        NSLog(@"adding album:'Compressed Videos', success: %s", group.editable ? "YES" : "NO");

        if (group.editable == NO) {
        }

    } failureBlock:^(NSError *error) {
        NSLog(@"error adding album");
    }];
}}