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December 9, 2013 21:41
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| // | |
| // ALAssetsLibraryUtil | |
| // | |
| // Created by Marin Todorov on 10/26/11. | |
| // Modified by sapzildj@gmail.com | |
| // | |
| // Copyright (c) 2011 Marin Todorov. All rights reserved. | |
| // original source from http://www.touch-code-magazine.com/ios5-saving-photos-in-custom-photo-album-category-for-download/ | |
| // | |
| #import "ALAssetsLibraryUtil.h" | |
| @implementation ALAssetsLibraryUtil | |
| // this method for ios5 asset library has lifetime | |
| + (ALAssetsLibrary *)defaultAssetsLibrary | |
| { | |
| static dispatch_once_t pred = 0; | |
| static ALAssetsLibrary *library = nil; | |
| dispatch_once(&pred, ^{ | |
| // ios5.0 has bug when access to asset or UIImagePicker(ios 5.1 fixed) | |
| // wrap with try/catch and library is nil then pred = 0 to rerun dispatch_once | |
| // reference : https://devforums.apple.com/message/568023#568023 | |
| // reference : http://stackoverflow.com/questions/7701578/app-crashes-when-trying-to-obtain-photos-from-photo-library-via-image-picker | |
| @try | |
| { | |
| library = [[ALAssetsLibrary alloc] init]; | |
| } | |
| @catch (NSException *e) | |
| { | |
| LOG_OBJECT(e); | |
| } | |
| }); | |
| if (!library) | |
| { | |
| pred = 0; | |
| } | |
| return library; | |
| } | |
| // UIImageWriteToSavedPhotosAlbum callback | |
| + (void)didImageSavedPhotosAlbum:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo | |
| { | |
| LOG_METHOD(); | |
| SaveImageCompletion completionBlock = (SaveImageCompletion)contextInfo; | |
| completionBlock(error); | |
| [completionBlock release]; | |
| } | |
| + (void)saveImage:(UIImage*)image toAlbum:(NSString*)albumName withCompletionBlock:(SaveImageCompletion)completionBlock | |
| { | |
| // iOS 5 or Later | |
| BOOL bIOS5 = ([[[UIDevice currentDevice] systemVersion] compare:@"5.0"] != NSOrderedAscending) ? YES : NO; | |
| if(bIOS5) | |
| { | |
| ALAssetsLibraryWriteImageCompletionBlock writeImageBlock = ^(NSURL* assetURL, NSError* error) | |
| { | |
| LOG_METHOD(); | |
| if (error) | |
| { | |
| completionBlock(error); | |
| } | |
| else | |
| { | |
| //add the asset to the custom photo album | |
| [self addAssetURL:assetURL | |
| toAlbum:albumName | |
| withCompletionBlock:completionBlock]; | |
| } | |
| }; | |
| //write the image data to the assets library (camera roll) | |
| [[self defaultAssetsLibrary] writeImageToSavedPhotosAlbum:image.CGImage | |
| orientation:(ALAssetOrientation)image.imageOrientation | |
| completionBlock:writeImageBlock]; | |
| } | |
| else | |
| { | |
| UIImageWriteToSavedPhotosAlbum(image, self, @selector(didImageSavedPhotosAlbum:didFinishSavingWithError:contextInfo:), [completionBlock copy]); | |
| } | |
| } | |
| + (void)addAssetURL:(NSURL*)assetURL toAlbum:(NSString*)albumName withCompletionBlock:(SaveImageCompletion)completionBlock | |
| { | |
| LOG_METHOD(); | |
| __block BOOL albumWasFound = NO; | |
| [[self defaultAssetsLibrary] assetForURL:assetURL | |
| resultBlock:^(ALAsset *asset) { | |
| LPLog(@"###### asset:%@", asset); | |
| //search all photo albums in the library | |
| [[self defaultAssetsLibrary] enumerateGroupsWithTypes:ALAssetsGroupAlbum | |
| usingBlock:^(ALAssetsGroup *group, BOOL *stop) { | |
| //compare the names of the albums | |
| if ([albumName compare:[group valueForProperty:ALAssetsGroupPropertyName]] == NSOrderedSame) | |
| { | |
| if ([group isEditable] == NO || [group addAsset:asset] == NO) | |
| { | |
| LPLog(@"###### addAsset fail %d", [group isEditable]); | |
| } | |
| albumWasFound = YES; | |
| completionBlock(nil); | |
| //album was found, bail out of the method | |
| *stop = YES; | |
| } | |
| else if (!group && albumWasFound == NO) | |
| { | |
| ALAssetsLibraryGroupResultBlock groupAddBlock = ^(ALAssetsGroup *addedGroup) | |
| { | |
| LPLog(@"###### groupAddBlock"); | |
| if ([addedGroup isEditable] == NO || [addedGroup addAsset:asset] == NO) | |
| { | |
| LPLog(@"###### addAsset fail %d", [addedGroup isEditable]); | |
| } | |
| completionBlock(nil); | |
| }; | |
| //create new assets album | |
| [[self defaultAssetsLibrary] addAssetsGroupAlbumWithName:albumName | |
| resultBlock:groupAddBlock | |
| failureBlock:completionBlock]; | |
| *stop = YES; | |
| } | |
| } failureBlock:completionBlock]; | |
| } failureBlock:completionBlock]; | |
| } | |
| @end |
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