iPhone：将图像保存到特定的相册

Question

The application I am working on manipulates an image for a user, and after the user is done, they can save that photo. I have no problem capturing the screen and saving it (as I want some of the labels saved with the image) but this call:

UIImageWriteToSavedPhotosAlbum([self getScreenAsImage] , nil, nil, nil);

only appears to allow me to save to the 'Saved Photos' album. Ideally I would like to create an album named after the application I am working on and save it there so that they are all stored together (for example like the Hawaii or graduation day albums on the simulator). It would also be nice then to launch the image picker in that specific album. Anyone know how to do this? Most important part is to be able to save it in an album, being able to launch the picker in that album is of secondary importance.

Answer 1

There is a way to do it, Apple just hasn't made it simple.

There is a custom category that adds the functionality to ALAssetsLibrary.

Git repo for the category can be found here

and if you are using Cocoapods you can get it with

pod 'ALAssetsLibrary-CustomPhotoAlbum'

You will need to instantiate a ALAssetsLibrary object and call the method below

- (void)saveImage:(UIImage *)image
      toAlbum:(NSString *)albumName
   completion:(ALAssetsLibraryWriteImageCompletionBlock)completion
      failure:(ALAssetsLibraryAccessFailureBlock)failure

Something like below

Import:

#import "ALAssetsLibrary+CustomPhotoAlbum.h" //Source Included (Git)

or

#import <ALAssetsLibrary+CustomPhotoAlbum.h> //Cocoapods

Call:

ALAssetsLibrary *assetsLib = [[ALAssetsLibrary alloc] init];
[assetsLib saveImage:imageToSave
                      toAlbum:@"AlbumName"
                   completion:completionBlock
                      failure:failureBlock];

Answer 2

You can use the ALAssetsLibrary for doing this:

ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

[library saveImage:image toAlbum:@"Midhun" withCompletionBlock:^(NSError *error) {
        if (error!=nil) {
            NSLog(@"Error: %@", [error description]);
        }
    }];

Check this tutorial also: Custom Photo Album

Answer 3

To the best of my knowledge Apple has not exposed an SDK to allow for this. After a review the UIKit function reference, My fear seems confirmed.