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POZeroing ALAssetRepresentation after saving image captured via UIImagePickerController in iOS5
 

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  1. POZeroing ALAssetRepresentation after saving image captured via UIImagePickerController in iOS5
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    <p>In my app (which worked under iOS 4) I collect pictures selected via <strong>UIImagePickerController</strong>. Unfortunately, I have a strange problem after upgrading to iOS 5.</p> <p>In a nutshell, I store <strong>ALAssetRepresentation</strong> in <strong>NSMutableArray</strong>. When I add photos from Library, everything is ok. However, when I capture and save a picture, all <strong>ALAssetRepresentations</strong> (including a new one) become 0-sized. <strong>ALAssetRepresentation.size</strong> and <strong>ALAssetRepresentation.getBytes:fromOffset:length:error:</strong> return 0 and <strong>getBytes:error</strong> is nil.</p> <p>I init <strong>ALAssetsLibrary</strong> in <strong>AppDelegate</strong>, so the <em>“The lifetimes of objects you get back from a library instance are tied to the lifetime of the library instance.”</em> condition is OK.</p> <p>Is there a way to prevent ALAssetRepresentation from zeroing? Or how can I read image by bytes after this?</p> <p>My code:</p> <pre><code>-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{ if ([picker sourceType] == UIImagePickerControllerSourceTypePhotoLibrary){ [self addPhoto:[info valueForKey:UIImagePickerControllerReferenceURL]]; } else if ([picker sourceType] == UIImagePickerControllerSourceTypeCamera){ [self savePhoto:[info valueForKey:UIImagePickerControllerOriginalImage]]; } [self dismissModalViewControllerAnimated:YES]; } -(ALAssetsLibrary*) getLibrary{ if (!library){ testAppDelegate *appDelegate = (testAppDelegate *)[[UIApplication sharedApplication] delegate]; library = appDelegate.library; } NSLog(@"getLibrary: %@", library); return library; } -(void) addPhoto:(NSURL*) url{ ALAssetsLibraryAssetForURLResultBlock successBlock = ^(ALAsset *asset_){ ALAssetRepresentation *assetRepresentation = [[asset_ defaultRepresentation] retain]; [photos addObject: assetRepresentation]; }; ALAssetsLibraryAccessFailureBlock failureBlock = ^(NSError *error){ NSLog(@"Error: Cannot get image. %@", [error localizedDescription]); }; [[self getLibrary] assetForURL:url resultBlock:successBlock failureBlock:failureBlock]; } - (void)savePhoto:(UIImage *)image { [[self getLibrary] writeImageToSavedPhotosAlbum:[image CGImage] orientation:[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error) { if (error) { NSLog(@"Error: Cannot save image. %@", [error localizedDescription]); } else { NSLog(@"photo saved"); [self addPhoto:assetURL]; } }]; } </code></pre>
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