iPhoneの写真アプリケーションを開発しているので、カメラロールに「MyAlbum」という名前の別のアルバムを作成し、新しく作成したディレクトリ内に「MyImage.png」などのカスタム名でUIImageView画像を保存する必要があります。 。
これどうやってするの？
質問する
25071 次
7 に答える
19
AssetsLibraryは非推奨ですので、代わりにフレームワークを使用してくださいPhotos（iOS 8以降）。
// 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)
})
共有オブジェクトを使用して新しい写真を作成できますが、 Photos.appPHPhotoLibraryで管理する必要のあるアセットを操作するため、特定の名前を付けることはできません。各アセットには特定のプロパティがあります。オブジェクトのフェッチ、変更のリクエスト、アセット/サムネイルの読み込みとキャッシュなどを行うことができます。
カスタムアルバムを作成するには、 PHAssetCollectionChangeRequest.creationRequestForAssetCollection(withTitle:）を使用してください。
簡単な例：
// 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
}
})
}
import Photosライブラリすることを忘れないでください。
そのアルバムに新しい写真アセットを作成するには、 PHAssetChangeRequest.creationRequestForAsset(from:）を使用してください。
// 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
}
})
}
アップデート：
写真ライブラリを使用できるようにするには、アクセスをリクエストする必要があります。
PHPhotoLibrary.requestAuthorization { status in
switch status {
...
}
iOS 10以降では、「プライバシー-フォトライブラリの使用法の説明」のターゲット.plistファイルにアクセスするためのエントリも追加する必要があります。
<key>NSPhotoLibraryUsageDescription</key>
<string>Access to photos is needed to provide app features</string>
于 2016-05-16T07:34:10.970 に答える
18
iOSの次のコード行を使用して、カスタムアルバムを作成し、画像を非常に簡単に追加できます。
// 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);
}
}];
于 2012-08-28T05:36:09.090 に答える
8
新しいアルバムを作成します。
/// Create album with given title
/// - Parameters:
/// - title: the title
/// - completionHandler: the completion handler
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)
})
}
}
指定された名前のアルバムを取得します。
/// Get album with given title
/// - Parameters:
/// - title: the title
/// - completionHandler: the completion handler
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)
})
}
}
}
写真をフォトアルバムに保存します。
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)
})
}
}
}
于 2018-09-10T10:40:11.163 に答える
7
iOS5.0以降から動作していました。
AssetsLibrary/AssetsLibrary.hをインポートしてください
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");
}];
于 2014-04-03T07:11:46.343 に答える
0
iOS7およびiOS8用のアルバムを作成するための以下の方法を試すことができます
#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");
}];
}}
于 2015-04-08T09:23:34.487 に答える
0
/// Save images or videos（保存图片或视频）(kUTTypeImage, kUTTypeMovie)
/// Add to album if specified album name, and create album if needed
/// @params mediaArray UIImage, fileURL for a image or video
+ (void)_saveMediaArray:(NSArray *)mediaArray
options:(LAImageSaverOptions *)options
completion:(void (^)(NSError * _Nullable err))completion
{
NSInteger __block count = 0;
[PHPhotoLibrary.sharedPhotoLibrary performChanges:^{
// Create album if needed
PHAssetCollectionChangeRequest *assetCollectionChangeRequest = nil;
NSMutableArray<PHObjectPlaceholder *> *assetChangeRequestPlaceholders = nil;
if (options.targetAlbumName.length > 0) {
assetChangeRequestPlaceholders = [NSMutableArray arrayWithCapacity:mediaArray.count];
PHFetchOptions *fetchOptions = PHFetchOptions.new;
//fetchOptions.includeAssetSourceTypes = PHAssetSourceTypeUserLibrary;
fetchOptions.predicate = [NSPredicate predicateWithFormat:@"localizedTitle = %@", options.targetAlbumName]; // 不能用 block 形式的 predicate
PHAssetCollection * assetCollection = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:fetchOptions].firstObject;
if (nil == assetCollection) {
assetCollectionChangeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:options.targetAlbumName];
} else {
assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
}
}
// Save images
for (id item in mediaArray) {
PHAssetChangeRequest *assetChangeRequest = nil;
// image object
if ([item isKindOfClass:UIImage.class]) {
UIImage *image = (UIImage *)item;
assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
[assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
++count;
continue;
}
// file url for image or movie
NSURL *fileURL = (NSURL *)item;
if ([item isKindOfClass:NSURL.class] && fileURL.isFileURL) {
NSString *extension = fileURL.pathExtension;
if (extension.length == 0) {
NSLog(@"illegal fileURL(no path extension): %@", fileURL);
continue; // illegal file url
}
CFStringRef uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)extension, NULL);
BOOL isImage = false;
BOOL isVideo = false;
if (nil != uti && CFStringGetLength(uti) > 0) {
isImage = UTTypeConformsTo(uti, kUTTypeImage);
isVideo = UTTypeConformsTo(uti, kUTTypeMovie); // kUTTypeVideo, kUTTypeAudiovisualContent
}
if (isImage) {
assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImageAtFileURL:fileURL];
[assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
++count;
} if (isVideo) {
assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:fileURL];
[assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
++count;
} else {
NSLog(@"illegal fileURL(neither image nor movie): %@", fileURL);
continue; // illegal file url
}
}
}
// add to album if needed
[assetCollectionChangeRequest addAssets:assetChangeRequestPlaceholders];
} completionHandler:^(BOOL success, NSError * _Nullable error) {
// not in main thread
dispatch_async(dispatch_get_main_queue(), ^{
completion(error);
});
}];
}
ちなみに、あなたはもっとすることができますLAImageSaverOptions
@interface LAImageSaverOptions : NSObject
/// to show alert controller on the hostVC
@property(nonatomic, weak, null_resettable) UIViewController *hostVC;
/// total progress
@property (nonatomic, strong, null_resettable) NSProgress *progress;
// album name for saving images
@property (nonatomic, copy, nullable) NSString *targetAlbumName;
@end
于 2019-10-09T14:27:08.767 に答える
0
最初にカスタム名で画像をサンドボックスに保存してから、アルバムに保存することができます。
于 2021-02-22T04:52:14.063 に答える