I figured out how to get all the user's images in the camera roll using the AssestsLibrary:
- (void)updateLastPhotoThumbnail {
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
NSInteger numberOfAssets = [group numberOfAssets];
if (numberOfAssets > 0) {
NSLog(#"numberOfPictures: %d",numberOfAssets);
//NSInteger lastIndex = numberOfAssets - 1;
int i = 0;
for (i = 0; i <= numberOfAssets-1; i++) {
[group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:i] options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
UIImage *thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
NSLog(#"theObject!!!! -- (%d) %#",i,thumbnail);
[cameraRollPictures addObject:thumbnail];
}];
}
}
} failureBlock:^(NSError *error) {
NSLog(#"error: %#", error);
}];
}
I successfully created the array of UIIMages, but how could I get EXIF data from the UIImages using this snippet I have?
PS: I've looked at this http://code.google.com/p/iphone-exif, but I cannot get it to build without errors.
You can't get metadata from UIImage objects.
But you can query an ALasset object for metadata:
NSDictionary *metadata = [[result defaultRepresentation] metadata];
Chefs,
Hendrik
Related
I am making an app where I want to get the list of all albums name from gallery including smart folders(favorites, screenshots. this is an old app where we have used ALAsset in order to access the gallery in our app.
Is there any way through which we can access smart folders as well using ALAssetLibrary?
This code is help.
#import <AssetsLibrary/AssetsLibrary.h>
#property (nonatomic, strong) ALAssetsLibrary *_assetsLibrary;
- (ALAssetsLibrary *)defaultAssetsLibrary {
static dispatch_once_t pred = 0;
static ALAssetsLibrary *library = nil;
dispatch_once(&pred, ^{
library = [[ALAssetsLibrary alloc] init];
});
return library;
}
-(void) getgalleryPic
{
if (self.photos == nil) {
self.photos = [[NSMutableArray alloc] init];
}else
{
[self.photos removeAllObjects];
}
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
if (status == PHAuthorizationStatusAuthorized) {
// Access has been granted.
NSMutableArray *collector = [[NSMutableArray alloc] initWithCapacity:0];
ALAssetsLibrary *library = [self defaultAssetsLibrary];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
{
if (asset) {
[collector addObject:asset];
}else
{
self.photos = [[[collector reverseObjectEnumerator] allObjects] mutableCopy];
NSLog(#"photo lenght %lu",(unsigned long)[self.photos count]);
[_collectionVW reloadData];
}
}];
}
failureBlock:^(NSError *error) { NSLog(#"Boom!!!");}
];
}
else if (status == PHAuthorizationStatusDenied) {
// Access has been denied.
}
else if (status == PHAuthorizationStatusNotDetermined) {
// Access has not been determined.
[PHPhotoLibrary requestAuthorization:^(PHAuthorizationStatus status) {
if (status == PHAuthorizationStatusAuthorized) {
// Access has been granted.
NSMutableArray *collector = [[NSMutableArray alloc] initWithCapacity:0];
ALAssetsLibrary *library = [self defaultAssetsLibrary];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
{
if (asset) {
[collector addObject:asset];
}else
{
self.photos = [[[collector reverseObjectEnumerator] allObjects] mutableCopy];
NSLog(#"photo lenght %lu",(unsigned long)[self.photos count]);
[_collectionVW reloadData];
}
}];
}
failureBlock:^(NSError *error) { NSLog(#"Boom!!!");}
];
}
else {
// Access has been denied.
}
}];
} else if (status == PHAuthorizationStatusRestricted) {
// Restricted access - normally won't happen.
}
}
I am getting all videos from custom album in my app and i need to show those videos into a UICollectionView.
I was able to get the videos to an array and to show the thumbnail of the video ..
How can i get the details of the videos for example: video duration, date of the recording, etc ..
This is how i got the videos from a specific album
assets = [NSMutableArray new];
_library = [ALAssetsLibrary new];
[_library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop){
if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqual:#"Custom App Album"]) {
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop){
[group setAssetsFilter:[ALAssetsFilter allVideos]];
if ([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypeVideo]) {
NSLog(#"asset: %#", result);
[assets addObject:result];
}
[_collectionView reloadData];
}];
}
} failureBlock:^(NSError *error){
NSLog(#"failure");
}];
And this is how i displayed the thumbnail,
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
GalleryCell *galleryCell = (GalleryCell*)[collectionView dequeueReusableCellWithReuseIdentifier:#"GalleryCell" forIndexPath:indexPath];
ALAsset *alasset = [assets objectAtIndex:indexPath.row];
galleryCell.videoImageView.image = [UIImage imageWithCGImage:alasset.thumbnail];
return galleryCell;
}
Thanks.
Here is the code snippet from React Native. You can get the details from the result and group.
CGSize dimensions = [result defaultRepresentation].dimensions;
CLLocation *loc = [result valueForProperty:ALAssetPropertyLocation];
NSDate *date = [result valueForProperty:ALAssetPropertyDate];
[assets addObject:#{
#"node": #{
#"type": [result valueForProperty:ALAssetPropertyType],
#"group_name": [group valueForProperty:ALAssetsGroupPropertyName],
#"image": #{
#"uri": uri,
#"height": #(dimensions.height),
#"width": #(dimensions.width),
#"isStored": #YES,
},
#"timestamp": #(date.timeIntervalSince1970),
#"location": loc ?
#{
#"latitude": #(loc.coordinate.latitude),
#"longitude": #(loc.coordinate.longitude),
#"altitude": #(loc.altitude),
#"heading": #(loc.course),
#"speed": #(loc.speed),
} : #{},
}
}];
I am really lost .
why i get NSLog twice for each UIImage ?
//------ get the images from the camera roll ----------
assets=[[NSMutableArray alloc]init];
NSMutableArray *cameraRollPictures=[[NSMutableArray alloc]init];
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
NSInteger numberOfAssets = [group numberOfAssets];
NSLog(#"NUM OF IMAGES:%d",numberOfAssets);
if (numberOfAssets > 0)
{
for (int i = 0; i <= numberOfAssets-1; i++)
{
[group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:i] options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop)
{
UIImage *thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
[assets addObject:thumbnail];
NSLog(#"theObject!!!! -- (%d) %#",i,thumbnail);
//******* for each i its here twice !! ********
}];
}
}
For some reason, enumerateAssetsAtIndexes (and enumerateAssetsUsingBlock) do an additional invocation of the block with result == nil and index == NSNotFound at the end of the enumeration. This becomes obvious if you change the NSLog() to
NSLog(#"i=%d, index=%ld, result=%#", i, (unsigned long)index, result);
Then you will get the output
NUM OF IMAGES:2
i=0, index=0, result=ALAsset - Type:Photo, URLs:assets-library://asset/asset.PNG?id=...
i=0, index=2147483647, result=(null)
i=1, index=1, result=ALAsset - Type:Photo, URLs:assets-library://asset/asset.PNG?id=...
i=1, index=2147483647, result=(null)
Therefore you have to check the value of result and ignore a nil value:
for (int i = 0; i <= numberOfAssets-1; i++) {
[group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:i] options:0 usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop)
{
if (result != nil) {
UIImage *thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
[assets addObject:thumbnail];
}
}];
}
Note that you can simplify the enumeration to
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result != nil) {
UIImage *thumbnail = [UIImage imageWithCGImage:[result thumbnail]];
[assets addObject:thumbnail];
}
}];
I would like to get all of the images from the camera roll and create an array of UIImages from them.
I have been trying to figure out how to do this for about a day now and I've gotten nowhere. I can't seem to figure out how to retrieve only items from the Camera Roll. It appears that all of the samples that I've seen all enumerate over all of the photo albums. I might be wrong about that though.
Any help would be appreciated. Thanks!
Have you tried ALAssetsLibrary? like this:
assets = [[NSMutableArray array] init]; // Prepare array to have retrieved images by Assets Library.
void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *asset, NSUInteger index, BOOL *stop) {
if(asset != NULL) {
[assets addObject:asset];
dispatch_async(dispatch_get_main_queue(), ^{
[self insertArray];
});
}
};
void (^assetGroupEnumerator)(ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) {
if(group != nil) {
[group enumerateAssetsUsingBlock:assetEnumerator];
}
};
// Create instance of the Assets Library.
library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos // Retrieve the images saved in the Camera roll.
usingBlock:assetGroupEnumerator
failureBlock: ^(NSError *error) {
NSLog(#"Failed.");
}];
that'll nab them. then do this to render them (this is wicked hacky. you'll want to import them as needed and not all at once like this, or you'll run into memory issues and crash)
-(void) insertArray {
int i = assetCount++;
if (i>20) {
return;
}
ALAssetRepresentation *rep = [[assets objectAtIndex:i] defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
CGSize cSize = CGSizeMake(75,75);
UIImage *largeimage = [UIImage imageWithCGImage:iref];
UIImage *resizedimage = (UIImage *)[largeimage resizedImage:cSize interpolationQuality:kCGInterpolationHigh];
UIImageView *newView = [[UIImageView alloc] initWithImage:resizedimage];
if((i>0)&&(i%4 == 0)){
rowCount++;
}
colCount = i%4;
newView.frame = CGRectMake(4+(colCount*(75+4)), 4+(rowCount*(75+4)), 75, 75);
[sv addSubview:newView];
[sv setContentSize:CGSizeMake(320, 85+(rowCount*(75+4)))];
NSLog(#"sv frame size is %# and i is %i", NSStringFromCGRect(sv.frame), i);
}
here is my code:
[library enumerateGroupsWithTypes:ALAssetsGroupAlbum
usingBlock:assetGroupEnumerator
failureBlock: ^(NSError *error) {
NSLog(#"Failure");
}];
my previous code is this:
assets = [[NSMutableArray alloc] init];
void (^assetEnumerator)( ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop) {
if(result != NULL) {
NSLog(#"See Asset: %#", result);
[assets addObject:result];
}
};
void (^assetGroupEnumerator)( ALAssetsGroup *, BOOL *) = ^(ALAssetsGroup *group, BOOL *stop) {
if(group != nil) {
[group enumerateAssetsUsingBlock:assetEnumerator];
}
[self.tableView reloadData];
};
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
and with my phone (ios5) doesn't work, can't go to the assetGroupEnumerator...
also in the simulator, the same thing....
any ideas?
thanks in advance
Are you releasing your ALAssetsLibrary before you are done displaying the assets? You need to retain the library throughout the lifetime of the groups and assets you are using.