I am trying to load an asset from a local identifier. The local identifier seems to be correct but the asset is null and I can't figure out why. I have a similar code in another part of my app that works fine.
Queue *queue = [NSEntityDescription insertNewObjectForEntityForName:#"Queue" inManagedObjectContext:self.context];
for (int reyrt = 0; reyrt < self.storeGIF.count; reyrt++) {
queue.queuetextimagePath = [self.storeGIF objectAtIndex:reyrt];
}
__block float fileSize;
NSArray *identifiers = #[queue.queuetextimagePath];
PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:identifiers options:nil];
PHAsset *asset = [assetsFetchResult firstObject];
NSLog (#"identifiers: %#", identifiers);
NSLog (#"assetsFetchResult: %#", assetsFetchResult);
NSLog (#"asset: %#", asset);
if (!asset) {
NSLog(#"can't retrieve PHAsset from localIdentifier:%#",identifiers);
}
Here is the NSLog file result when using the above code.
019-07-19 09:26:36.366739-0400 myApp[1440:328144] identifiers: (
"857AC3DA-C047-4D88-911B-C5FE227E2B96/L0/001"
)
2019-07-19 09:26:36.366945-0400 myApp[1440:328144] assetsFetchResult PHFetchResult: 0x281129900 count=0
2019-07-19 09:26:36.366982-0400 myApp[1440:328144] asset: (null)
2019-07-19 09:26:36.367061-0400 myApp[1440:328144] can't retrieve PHAsset from localIdentifier:(
"857AC3DA-C047-4D88-911B-C5FE227E2B96/L0/001"
)
The problem is that you should drop /L0/001 part before requesting the object. I don't understand why uuid strings contain these suffixes, but it works if you drop it and use only normal UUID part.
I need to retrieve the names of all the PHAsset existing in the Camera Roll, individually and in a short time.
To get the file name, I use the documented originalFilename property of PHAssetResource associated to the PHAsset.
This works fine for the first assets, but at some point (after around 400 assets), it starts failing and returning nil every time.
Here is a code that shows this behavior (running on an iPhone 7 with ~800 photos in the Camera Roll):
PHFetchResult *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum
subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:nil];
PHAssetCollection *assetCollection = result.firstObject;
PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
for (int i = index; i<[assets count]; i++) {
PHAsset *asset = assets[i];
NSArray *resources = [PHAssetResource assetResourcesForAsset:asset];
NSString *name = (resources.count > 0) ? [(PHAssetResource*)resources.firstObject originalFilename] : nil;
NSLog(#"%i: %#", i, name);
}
When using undocumented methods to get the file name, such as [asset valueForKey#"filenamme"] or the PHImageFileURLKey key of the info dictionary returned by the PHImageManager, everything works well (although the name is different than with the originalFilename and well, it's not reliable since it's not documented).
How come the official method is that unreliable?
Is there something I do wrong?
I have an array filled with PHAsset objects (https://developer.apple.com/library/prerelease/ios/documentation/Photos/Reference/PHAsset_Class/index.html), and I want to know how I can convert them into a UIImage and then save them in an Array.
The array with the PHAsset objects is called self.assets and here is what I have so far:
PHImageManager *manager = [PHImageManager defaultManager];
CGFloat scale = UIScreen.mainScreen.scale;
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[self.assets count]];
for (int i = 0; i < [self.assets count]; i++) {
CGSize targetSize = CGSizeMake(scale, scale);
[manager requestImageForAsset:[self.assets objectAtIndex:i]
targetSize:targetSize
contentMode:PHImageContentModeAspectFill
options:self.requestOptions
resultHandler:^(UIImage *image, NSDictionary *info){
[images addObject:image];
}];
}
self.requestOptions is a property in the .h
#property (nonatomic, strong) PHImageRequestOptions *requestOptions;
and in the viewDidLoad I am doing this:
self.requestOptions = [[PHImageRequestOptions alloc] init];
self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
But after doing some debugging, I keep seeing that self.assets has the following values:
(
<PHAsset: 0x1743828a0> 3B6D658D-EC76-43A1-9793-35D889E9CF15/L0/001 mediaType=1/0, assetSource=3, (2448x2448), creationDate=2015-07-27 02:02:46 +0000, location=1, hidden=0, favorite=0 ,
<PHAsset: 0x174382970> 50F05575-71D2-446B-BD1E-8E3250E375AD/L0/001 mediaType=1/0, assetSource=3, (2448x2448), creationDate=2015-07-27 02:02:47 +0000, location=1, hidden=0, favorite=0
)
and images is empty. Does anyone know how I can add convert the PHAssets into UIImages and add them to the images array? Any help is appreciated. Thanks!
For anyone struggling as much as I had on this issue, this is the way to go.
First set the requestOptions as:
self.requestOptions = [[PHImageRequestOptions alloc] init];
self.requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
self.requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
// this one is key
self.requestOptions.synchronous = YES;
and if there are multiple assets in an array filled with PHAsset objects, then add this code:
self.assets = [NSMutableArray arrayWithArray:assets];
PHImageManager *manager = [PHImageManager defaultManager];
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[assets count]];
// assets contains PHAsset objects.
__block UIImage *ima;
for (PHAsset *asset in self.assets) {
// Do something with the asset
[manager requestImageForAsset:asset
targetSize:PHImageManagerMaximumSize
contentMode:PHImageContentModeDefault
options:self.requestOptions
resultHandler:^void(UIImage *image, NSDictionary *info) {
ima = image;
[images addObject:ima];
}];
}
and now the images array contains all the images in uiimage format.
Swift 3.0 Answer
let photoAsset = asset
let manager = PHImageManager.default()
var options: PHImageRequestOptions?
options = PHImageRequestOptions()
options?.resizeMode = .exact
options?.isSynchronous = true
manager.requestImage(
for: photoAsset,
targetSize: PHImageManagerMaximumSize,
contentMode: .aspectFill,
options: options
) { [weak self] result, _ in
completion(result)
}
options?.isSynchronous = true is very important
BOOL synchronous; // return only a single result, blocking until available (or failure). Defaults to NO
image may be nil(seldom). It's better to evaluate, otherwise array add nil will crash app.
if(image){
ima = image;
[images addObject:ima];
}
The following code loads images that are also located on iCloud or the streams images. How can we limit the search to only images in the camera roll?
var assets = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: nil)
After adding the Camera Roll and Photo Stream albums, Apple added the following PHAssetCollectionSubtype types in iOS 8.1:
PHAssetCollectionSubtypeAlbumMyPhotoStream (together with PHAssetCollectionTypeAlbum) - fetches the Photo Stream album.
PHAssetCollectionSubtypeSmartAlbumUserLibrary (together with PHAssetCollectionTypeSmartAlbum) - fetches the Camera Roll album.
Haven't tested if this is backward-compatible with iOS 8.0.x though.
Through some experimentation we discovered a hidden property not listed in the documentation (assetSource). Basically you have to do a regular fetch request, then use a predicate to filter the ones from the camera roll. This value should be 3.
Sample code:
//fetch all assets, then sub fetch only the range we need
var assets = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: fetchOptions)
assets.enumerateObjectsUsingBlock { (obj, idx, bool) -> Void in
results.addObject(obj)
}
var cameraRollAssets = results.filteredArrayUsingPredicate(NSPredicate(format: "assetSource == %#", argumentArray: [3]))
results = NSMutableArray(array: cameraRollAssets)
If you are searching like me for Objective C code, and also you didn't get Answer of new library/ Photo Framework as you were getting deprecated AssetsLibrary's code , Then this will help you:
Swift
Global Variables:
func getAllPhotosFromCameraRoll() -> [UIImage] {
// TODO: Add `NSPhotoLibraryUsageDescription` to info.plist
PHPhotoLibrary.requestAuthorization { print($0) } // TODO: Move this line of code to somewhere before attempting to access photos
var images = [UIImage]()
let requestOptions: PHImageRequestOptions = PHImageRequestOptions()
requestOptions.resizeMode = .exact
requestOptions.deliveryMode = .highQualityFormat
requestOptions.isSynchronous = true
let fetchResult: PHFetchResult = PHAsset.fetchAssets(with: .image, options: nil)
let manager: PHImageManager = PHImageManager.default()
for i in 0..<fetchResult.count {
let asset = fetchResult.object(at: i)
manager.requestImage(
for: asset,
targetSize: PHImageManagerMaximumSize,
contentMode: .default,
options: requestOptions,
resultHandler: { (image: UIImage?, info: [AnyHashable: Any]?) -> Void in
if let image = image {
images.append(image)
}
})
}
return images
}
Objective C
Global Variables:
NSArray *imageArray;
NSMutableArray *mutableArray;
below method will help you:
-(void)getAllPhotosFromCamera
{
imageArray=[[NSArray alloc] init];
mutableArray =[[NSMutableArray alloc]init];
PHImageRequestOptions *requestOptions = [[PHImageRequestOptions alloc] init];
requestOptions.resizeMode = PHImageRequestOptionsResizeModeExact;
requestOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
requestOptions.synchronous = true;
PHFetchResult *result = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];
NSLog(#"%d",(int)result.count);
PHImageManager *manager = [PHImageManager defaultManager];
NSMutableArray *images = [NSMutableArray arrayWithCapacity:[result count]];
// assets contains PHAsset objects.
__block UIImage *ima;
for (PHAsset *asset in result) {
// Do something with the asset
[manager requestImageForAsset:asset
targetSize:PHImageManagerMaximumSize
contentMode:PHImageContentModeDefault
options:requestOptions
resultHandler:^void(UIImage *image, NSDictionary *info) {
ima = image;
[images addObject:ima];
}];
}
imageArray = [images copy]; // You can direct use NSMutuable Array images
}
If you use your own PHCachingImageManager instead of the shared PHImageManager instance then when you call requestImageForAsset:targetSize:contentMode:options:resultHandler: you can set an option in PHImageRequestOptions to specify that the image is local.
networkAccessAllowed
Property
A Boolean value that specifies whether Photos can download the requested image from iCloud.
networkAccessAllowed
Discussion
If YES, and the requested image is not stored on the local device, Photos downloads the image from iCloud. To be notified of the download’s progress, use the progressHandler property to provide a block that Photos calls periodically while downloading the image. If NO (the default), and the image is not on the local device, the PHImageResultIsInCloudKey value in the result handler’s info dictionary indicates that the image is not available unless you enable network access.
This can help. You can use your own data model instead of AlbumModel I used.
func getCameraRoll() -> AlbumModel {
var cameraRollAlbum : AlbumModel!
let cameraRoll = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .smartAlbumUserLibrary, options: nil)
cameraRoll.enumerateObjects({ (object: AnyObject!, count: Int, stop: UnsafeMutablePointer) in
if object is PHAssetCollection {
let obj:PHAssetCollection = object as! PHAssetCollection
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)
let assets = PHAsset.fetchAssets(in: obj, options: fetchOptions)
if assets.count > 0 {
let newAlbum = AlbumModel(name: obj.localizedTitle!, count: assets.count, collection:obj, assets: assets)
cameraRollAlbum = newAlbum
}
}
})
return cameraRollAlbum
}
Here is Objective- c version provided by apple.
-(NSMutableArray *)getNumberOfPhotoFromCameraRoll:(NSArray *)array{
PHFetchResult *fetchResult = array[1];
int index = 0;
unsigned long pictures = 0;
for(int i = 0; i < fetchResult.count; i++){
unsigned long temp = 0;
temp = [PHAsset fetchAssetsInAssetCollection:fetchResult[i] options:nil].count;
if(temp > pictures ){
pictures = temp;
index = i;
}
}
PHCollection *collection = fetchResult[index];
if (![collection isKindOfClass:[PHAssetCollection class]]) {
// return;
}
// Configure the AAPLAssetGridViewController with the asset collection.
PHAssetCollection *assetCollection = (PHAssetCollection *)collection;
PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:nil];
self. assetsFetchResults = assetsFetchResult;
self. assetCollection = assetCollection;
self.numberOfPhotoArray = [NSMutableArray array];
for (int i = 0; i<[assetsFetchResult count]; i++) {
PHAsset *asset = assetsFetchResult[i];
[self.numberOfPhotoArray addObject:asset];
}
NSLog(#"%lu",(unsigned long)[self.numberOfPhotoArray count]);
return self.numberOfPhotoArray;
}
Where you can grab following details
PHFetchResult *fetchResult = self.sectionFetchResults[1];
PHCollection *collection = fetchResult[6];
**value 1,6 used to get camera images**
**value 1,0 used to get screen shots**
**value 1,1 used to get hidden**
**value 1,2 used to get selfies**
**value 1,3 used to get recently added**
**value 1,4 used to get videos**
**value 1,5 used to get recently deleted**
**value 1,7 used to get favorites**
Apple demo link
Declare your property
#property (nonatomic, strong) NSArray *sectionFetchResults;
#property (nonatomic, strong) PHFetchResult *assetsFetchResults;
#property (nonatomic, strong) PHAssetCollection *assetCollection;
#property (nonatomic, strong) NSMutableArray *numberOfPhotoArray;
I've been banging my head over this too. I've found no way to filter for only assets on the device with fetchAssetsWithMediaType or fetchAssetsInAssetCollection. I'm able to use requestContentEditingInputWithOptions or requestImageDataForAsset to determine if the asset is on the device or not, but this is asynchronous and seems like it's using way too much resources to do for every asset in the list. There must be a better way.
PHFetchResult *fetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil];
for (int i=0; i<[fetchResult count]; i++) {
PHAsset *asset = fetchResult[i];
[asset requestContentEditingInputWithOptions:nil
completionHandler:^(PHContentEditingInput *contentEditingInput, NSDictionary *info) {
if ([[info objectForKey:PHContentEditingInputResultIsInCloudKey] intValue] == 1) {
NSLog(#"asset is in cloud");
} else {
NSLog(#"asset is on device");
}
}];
}
If you don't want to rely on an undocumented API, look at [asset canPerformEditOperation:PHAssetEditOperationContent]. This only returns true if the full original is available on device.
Admittedly this is also fragile, but testing shows it works for all of the assetSource types (photostream, iTunes sync, etc).
I want to get the ISRC code for Local itunes songs. I can get the metaData by the following codes:
MPMusicPlayerController *mp= mp = [MPMusicPlayerController applicationMusicPlayer];
NSURL *assetURL = [mp.nowPlayingItem valueForProperty:MPMediaItemPropertyAssetURL];
AVAsset *asset = [AVAsset assetWithURL:assetURL];
NSArray *metadata = [asset commonMetadata];
for ( AVMetadataItem* item in metadata ) {
NSString *key = [item commonKey];
NSString *value = [item stringValue];
NSLog(#"extra iptions %#",[item extraAttributes]);
NSLog(#"key = %#, value = %#", key, value);
NSLog(#"keyspace and Local %# %#",[item keySpace],[item key]);
}
But I am really wondering about how to get ISRC(International Standard Record Coding).
Try this (warning: typed into browser)
NSArray *metadata = [asset metadataForFormat:AVMetadataFormatID3Metadata];
if (metadata == nil) {
NSLog(#"No ID3 metadata for asset: %#", asset);
}
// From https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVFoundation_ID3Constants/Reference/reference.html
NSArray *filteredMetadata = [AVMetadataItem metadataItemsFromArray:metadata withKey:AVMetadataID3MetadataKeyInternationalStandardRecordingCode keySpace:nil];
AVMetadataItem *item = [filteredMetadata firstObject];
if (item != nil) {
NSLog(#"ISRC: %#", item.stringValue);
} else {
NSLog(#"No ISRC found for: %#", asset);
}
EDIT: I should mention, the reason your original code didn't print the value of the ISRC is because the ISRC is not part of the common metadata space, and won't be included in the array returned by [asset commonMetadata]. The ISRC key is specific to ID3 metadata, so if your asset does not have ID3 metadata associated with it, you will be unable to retrieve that information.