app about remove duplicate photos from photos app - ios

Question

I am creating an Application that fetches Images from the photo library of the phone and remove duplicate images from it.I searched a lot but did not find any way to delete the image from the photo library.

Answer 1

i create on demo for that
here is the code
i used UIImageJPEGRepresentation to convert image into data.and compare them it gives me result.is there any other image property that we can compare?
UIImage *img1 = [UIImage imageNamed:#"1.jpg"];
UIImage *img2 = [UIImage imageNamed:#"2.jpg"];
NSData *data1 = UIImageJPEGRepresentation(img1, 1.0);
NSLog(#"%#",data1);
NSData *data2 = UIImageJPEGRepresentation(img2, 1.0);
NSLog(#"%#",data2);
if ([data1 isEqualToData:data2])
{
NSLog(#"yes");
}
else
{
NSLog(#"no");
}

Answer 2

As you know we dont have access to modify anything out side the sandbox.So before ios 8 it was not possible to delete photos from photo library.But in ios 8 and later versions are supported to delete photos from library but before removing it will ask user that you want to delete photos.If user allow then photos will be deleted.
I providing you the CODE which I have used in my app to delete photo from photo library.
if (check system version >= 8.0)
{
PHPhotoLibrary *library = [PHPhotoLibrary sharedPhotoLibrary];
[library performChanges:^{
PHFetchResult *assetsToBeDeleted = [PHAsset fetchAssetsWithALAssetURLs:delet
options:nil];
[PHAssetChangeRequest deleteAssets:assetsToBeDeleted];
} completionHandler:^(BOOL success, NSError *error) {
//do something here when error
}];
}
Where delet is the array of asset url of images you get from library with help of AssetLibrary framework.

Answer 3

PHFetchResult *moments = [PHAssetCollection fetchMomentsWithOptions:nil];
for (PHAssetCollection *moment in moments)
{
PHFetchResult *assetsFetchResults = [PHAsset fetchAssetsInAssetCollection:moment options:nil];
for (PHAsset *asset in assetsFetchResults)
{
// Do something with assets, for example add them to array.
}
}