How to save picture to iPhone photo library?

Question

You can use this function:

UIImageWriteToSavedPhotosAlbum(UIImage *image, 
                               id completionTarget, 
                               SEL completionSelector, 
                               void *contextInfo);

You only need completionTarget, completionSelector and contextInfo if you want to be notified when the UIImage is done saving, otherwise you can pass in nil.

See the official documentation for UIImageWriteToSavedPhotosAlbum().

Deprecated in iOS 9.0.

There`s much more fast then UIImageWriteToSavedPhotosAlbum way to do it using iOS 4.0+ AssetsLibrary framework

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

    [library writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:^(NSURL *assetURL, NSError *error){
    if (error) {
    // TODO: error handling
    } else {
    // TODO: success handling
    }
}];
[library release];

The simplest way is:

UIImageWriteToSavedPhotosAlbum(myUIImage, nil, nil, nil);

For Swift, you can refer to Saving to the iOS photo library using swift

One thing to remember: If you use a callback, make sure that your selector conforms to the following form:

- (void) image: (UIImage *) image didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo;

Otherwise, you'll crash with an error such as the following:

[NSInvocation setArgument:atIndex:]: index (2) out of bounds [-1, 1]

Just pass the images from an array to it like so

-(void) saveMePlease {

//Loop through the array here
for (int i=0:i<[arrayOfPhotos count]:i++){
         NSString *file = [arrayOfPhotos objectAtIndex:i];
         NSString *path = [get the path of the image like you would in DOCS FOLDER or whatever];
         NSString *imagePath = [path stringByAppendingString:file];
         UIImage *image = [[[UIImage alloc] initWithContentsOfFile:imagePath]autorelease];

         //Now it will do this for each photo in the array
         UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
        }
}

Sorry for typo's kinda just did this on the fly but you get the point