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我正在开发一个iOS应用程序，其中需要像Instagram一样的图库视图。我已添加相册视图，相机视图和视频视图，拍摄后将其保存到相册的自定义相册中。现在我想从自定义相册中检索这些图像并将其显示到图库的“收藏”视图。但是我陷入了从自定义相册中检索这些图像的困境。任何帮助将不胜感激。 
如何从照片，iOS SDK的自定义相册中获取图像？
编辑： 我添加了用于创建自定义相册的PHPhotoLibrary，在此之前我添加了AssetsLibrary框架。
然后，我创建了一个NSObject类（CustomAlbum），用于使用PHPhotoLibrary创建和管理自定义相册。
// CustomAlbum.h
#import <Foundation/Foundation.h>
#import <Photos/Photos.h>
@interface CustomAlbum : NSObject
//Creating album with given name
+(void)makeAlbumWithTitle:(NSString *)title onSuccess:(void(^)(NSString *AlbumId))onSuccess onError: (void(^)(NSError * error)) onError;
//Get the album by name
+(PHAssetCollection *)getMyAlbumWithName:(NSString*)AlbumName;
//Add a image
+(void)addNewAssetWithImage:(UIImage *)image toAlbum:(PHAssetCollection *)album onSuccess:(void(^)(NSString *ImageId))onSuccess onError: (void(^)(NSError * error)) onError;
//get the image using identifier
+ (void)getImageWithIdentifier:(NSString*)imageId onSuccess:(void(^)(UIImage *image))onSuccess onError: (void(^)(NSError * error)) onError;
@end
// CustomAlbum.m
#import "CustomAlbum.h"
@implementation CustomAlbum
#pragma mark - PHPhoto
+(void)makeAlbumWithTitle:(NSString *)title onSuccess:(void(^)(NSString *AlbumId))onSuccess onError: (void(^)(NSError * error)) onError
{
//Check weather the album already exist or not
if (![self getMyAlbumWithName:title]) {
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// Request editing the album.
PHAssetCollectionChangeRequest *createAlbumRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title];
// Get a placeholder for the new asset and add it to the album editing request.
PHObjectPlaceholder * placeHolder = [createAlbumRequest placeholderForCreatedAssetCollection];
if (placeHolder) {
onSuccess(placeHolder.localIdentifier);
}
} completionHandler:^(BOOL success, NSError *error) {
NSLog(@"Finished adding asset. %@", (success ? @"Success" : error));
if (error) {
onError(error);
}
}];
}
}
+(void)addNewAssetWithImage:(UIImage *)image toAlbum:(PHAssetCollection *)album onSuccess:(void(^)(NSString *ImageId))onSuccess onError: (void(^)(NSError * error)) onError
{
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
// Request creating an asset from the image.
PHAssetChangeRequest *createAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
// Request editing the album.
PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:album];
// Get a placeholder for the new asset and add it to the album editing request.
PHObjectPlaceholder * placeHolder = [createAssetRequest placeholderForCreatedAsset];
[albumChangeRequest addAssets:@[ placeHolder ]];
NSLog(@"%@",placeHolder.localIdentifier);
if (placeHolder) {
onSuccess(placeHolder.localIdentifier);
}
} completionHandler:^(BOOL success, NSError *error) {
NSLog(@"Finished adding asset. %@", (success ? @"Success" : error));
if (error) {
onError(error);
}
}];
}
+(PHAssetCollection *)getMyAlbumWithName:(NSString*)AlbumName
{
#if 0
NSString * identifier = [[NSUserDefaults standardUserDefaults]objectForKey:kAlbumIdentifier];
if (!identifier) return nil;
PHFetchResult *assetCollections = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[identifier]
options:nil];
#else
PHFetchResult *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum
subtype:PHAssetCollectionSubtypeAlbumRegular
options:nil];
#endif
NSLog(@"assetCollections.count = %lu", assetCollections.count);
if (assetCollections.count == 0) return nil;
__block PHAssetCollection * myAlbum;
[assetCollections enumerateObjectsUsingBlock:^(PHAssetCollection *album, NSUInteger idx, BOOL *stop) {
NSLog(@"album:%@", album);
NSLog(@"album.localizedTitle:%@", album.localizedTitle);
if ([album.localizedTitle isEqualToString:AlbumName]) {
myAlbum = album;
*stop = YES;
}
}];
if (!myAlbum) return nil;
return myAlbum;
}
+(NSArray *)getAssets:(PHFetchResult *)fetch
{
__block NSMutableArray * assetArray = NSMutableArray.new;
[fetch enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop) {
NSLog(@"asset:%@", asset);
[assetArray addObject:asset];
}];
return assetArray;
}
+ (void)getImageWithIdentifier:(NSString*)imageId onSuccess:(void(^)(UIImage *image))onSuccess onError: (void(^)(NSError * error)) onError
{
NSError *error = [[NSError alloc] init];
PHFetchResult *assets = [PHAsset fetchAssetsWithLocalIdentifiers:@[imageId] options:nil];
if (assets.count == 0) onError(error);
NSArray * assetArray = [self getAssets:assets];
PHImageManager *manager = [PHImageManager defaultManager];
CGRect screenRect = [[UIScreen mainScreen] bounds];
[manager requestImageForAsset:assetArray.firstObject targetSize:screenRect.size contentMode:PHImageContentModeAspectFit options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
onSuccess(result);
}];
}
@end
然后用在起飞图片按钮这种方法单击创建自定义相册，并保存图像该自定义相册。
// Take Image Button Method
- (void)snapButtonPressed:(UIButton *)button
{
[self.camera capture:^(LLSimpleCamera *camera, UIImage *image,
NSDictionary *metadata, NSError *error)
{
if(!error)
{
NSString * info = [NSString stringWithFormat:@"Size: %@ - Orientation: %ld", NSStringFromCGSize(image.size), (long)image.imageOrientation];
[CustomAlbum addNewAssetWithImage:image toAlbum:[CustomAlbum getMyAlbumWithName:CSAlbum] onSuccess:^(NSString *ImageId) {
NSLog(@"%@",ImageId);
recentImg = ImageId;
} onError:^(NSError *error) {
NSLog(@"probelm in saving image");
}];
}
else
{
NSLog(@"An error has occured: %@", error);
}
}
exactSeenImage:YES];
}
用相关代码更新您的问题，并解释您在代码中遇到的问题。 – rmaddy
我正在使用PHPhotoLibrary创建自定义相册并保存由相机拍摄的图像。使用此源代码：https：//github.com/iBlahji/iOS-CustomPhotoAlbum 但问题是，我如何从这个自定义相册中获取图像并显示与UICollectionView。 – hmjha
@rmaddy plz查看我的代码并向我推荐任何解决方案。谢谢 – hmjha