alasset

问题 This might seem too easy or maybe it's just confusing for me... Or maybe I'm too tired to think rationally. I am trying to get the location of an UIImage that has been selected by the user from the photo album using imagePickerController. - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *pic = [info objectForKey:@"UIImagePickerControllerOriginalImage"]; NSData *data = UIImageJPEGRepresentation(pic, 0.01f); UIImage

问题 A prompt and convenient way of gererating thumbnails from an ALAsset is described in the answer to question "Generating custom thumbnail from ALAssetRepresentation" — see a blog post of the author. The only issue I have with this method is that it completely ignores all the filters or red-eye removal effects applied to an image (say one taken with stock iOS 7 Photo app + any filter in 'square' mode). How should the code be adjusted to return 'filtered' thumbnails? P.S. I know I can get

问题 I am currently using the following code to get an UIImage from an ALAsset in an iOS app. ALAssetRepresentation *rep = [self.asset defaultRepresentation]; CGImageRef ref = [rep fullResolutionImage]; ALAssetOrientation orientation = [[self.asset valueForProperty:@"ALAssetPropertyOrientation"] intValue]; UIImage *image = [UIImage imageWithCGImage:ref scale:1.0 orientation:(UIImageOrientation)orientation]; This works very well as long as the image is reasonably small (e.g. taken with the device's

问题 I can get images from Photo Library through ALAssetsLibrary: void (^assetEnumerator)(ALAsset *, NSUInteger, BOOL *) = ^(ALAsset *result, NSUInteger index, BOOL *stop){ if([[result valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) { // Copy the photo image to the `/Documents` directory of this App here } }; void (^assetGroupEnumerator )(ALAssetsGroup*, BOOL*) = ^(ALAssetsGroup *group, BOOL *stop){ if (group != nil) { [group enumerateAssetsUsingBlock:assetEnumerator]; } }

问题 Could somebody please explain or show some sample code of how I can use get a thumbnail to be put into a UIImageView after the user selects a photo with UIImagePickerController? Let's say I want to set a thumbnail as the image of a table view cell. When the user presses the cell, the image picker is shown and the user selects an image that is already on their device. I also want to save the path to that thumbnail so that the next time the view is displayed, the proper thumbnail can be shown.

问题 I want to send a photo from the camera roll to a web services - including its exif data. Im using ASIFormDataRequest - so I do : ASIFormDataRequest *request = [[ASIFormDataRequest alloc]initWithURL:url]; To save memory I directly want to send the file: [request addFile:localPath forKey:@"image"]; So i need the local path of the asset. I think I can not get the local path of an asset, so I temporarily save the asset to a file: ALAsset* selectedAsset = [assets objectAtIndex:index]; CGImageRef

问题 I have created "photos album" from my App, using IOS AssetsLibrary. Reading ALAssetsLibrary,ALAssetsGroup and ALAsset documentations, i have seen methods to "addAsset","addAssetsGroupAlbumWithName". Is there a way to delete PROGRAMMATICALLY my ALAssetsGroup and ALAsset. (the property 'editable' suppose to be TRUE because i create this data). 回答1: This is not possible using any documented API. Only the photos app can delete Albums. If you want this feature to be added to iOS, I would fill a

问题 I've got an array containing ALAsset urls (not full ALAsset objects) So each time I start my application I want to check my array to see if it's still up to date... So I tried NSData *assetData = [[NSData alloc] initWithContentsOfFile:@"assets-library://asset/asset.PNG?id=1000000001&ext=PNG"]; but assetData is allways nil thx for the help 回答1: Use assetForURL:resultBlock:failureBlock: method of ALAssetsLibrary instead to get the asset from its URL. // Create assets library ALAssetsLibrary

问题 Below is a screenshot from instrument app. Is there any explanation what is wrong with that line ? 回答1: ARC does not manage C-types, of which CGImage may be considered. You must release the ref manually when you are finished with CGImageRelease(image); found the answer hire 来源： https://stackoverflow.com/questions/23656934/imagewithcgimage-leaks-according-to-instrument

问题 I'm working working on an iPhone application for uploading video files to a specific platform, and one feature I would really love is to be able to present, say, ten different thumbnails for the same video for the user to pick from. The problem is, that ALAsset only provides a thumbnail method, which just returns the default thumbnail. I have read through the ALAssetRepresentation and ALAsset documentation and I can't seem to find a way to get a thumbnail for a specific timestamp. I guess one