我一直在按照这个教程http://www.touch-code-magazine.com/ios5-saving-photos-in-custom-photo-album-category-for-download/来将图片保存到自定义相册，虽然功能正常，但它同时将图片保存到了相机胶卷和我的自定义相册中。
根据代码的表现，似乎这是必要的步骤，因为在将图像保存到相机胶卷之后，我们有一个可以与ALAssetsGroup addAsset: 方法一起使用的ALAsset。
有没有办法将图像添加到自定义相册而不将其添加到相机胶卷中呢？
目前正在使用以下代码：
根据代码的表现，似乎这是必要的步骤，因为在将图像保存到相机胶卷之后，我们有一个可以与ALAssetsGroup addAsset: 方法一起使用的ALAsset。
有没有办法将图像添加到自定义相册而不将其添加到相机胶卷中呢？
目前正在使用以下代码：
-(void)saveImage:(UIImage*)image toAlbum:(NSString*)albumName withCompletionBlock:(SaveImageCompletion)completionBlock
{
//write the image data to the assets library (camera roll)
[self writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation
completionBlock:^(NSURL* assetURL, NSError* error) {
//error handling
if (error!=nil) {
completionBlock(error);
return;
}
//add the asset to the custom photo album
[self addAssetURL: assetURL
toAlbum:albumName
withCompletionBlock:completionBlock];
}];
}
-(void)addAssetURL:(NSURL*)assetURL toAlbum:(NSString*)albumName withCompletionBlock:(SaveImageCompletion)completionBlock
{
__block BOOL albumWasFound = NO;
//search all photo albums in the library
[self enumerateGroupsWithTypes:ALAssetsGroupAlbum
usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
//compare the names of the albums
if ([albumName compare: [group valueForProperty:ALAssetsGroupPropertyName]]==NSOrderedSame) {
//target album is found
albumWasFound = YES;
//get a hold of the photo's asset instance
[self assetForURL: assetURL
resultBlock:^(ALAsset *asset) {
//add photo to the target album
[group addAsset: asset];
//run the completion block
completionBlock(nil);
} failureBlock: completionBlock];
//album was found, bail out of the method
return;
}
if (group==nil && albumWasFound==NO) {
//photo albums are over, target album does not exist, thus create it
__weak ALAssetsLibrary* weakSelf = self;
//create new assets album
[self addAssetsGroupAlbumWithName:albumName
resultBlock:^(ALAssetsGroup *group) {
//get the photo's instance
[weakSelf assetForURL: assetURL
resultBlock:^(ALAsset *asset) {
//add photo to the newly created album
[group addAsset: asset];
//call the completion block
completionBlock(nil);
} failureBlock: completionBlock];
} failureBlock: completionBlock];
//should be the last iteration anyway, but just in case
return;
}
} failureBlock: completionBlock];
}