Save multiple custom UIImageViews - objective-c

Question

I was recently examining the project "Demo Photo Board" found here.
This is a simple demonstration of adding UIImageViews to the screen that have UIGestureRecognizers added to them...allowing the user to manipulate the various UIImageViews.
I add the view like so:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
imageview.userInteractionEnabled = YES;
[imageview setImage:image];
UIPinchGestureRecognizer *pinchRecognizer = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:#selector(scale:)];
[pinchRecognizer setDelegate:self];
[imageview addGestureRecognizer:pinchRecognizer];
UIRotationGestureRecognizer *rotationRecognizer = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:#selector(rotate:)];
[rotationRecognizer setDelegate:self];
[imageview addGestureRecognizer:rotationRecognizer];
UIPanGestureRecognizer *panRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(move:)];
[panRecognizer setMinimumNumberOfTouches:1];
[panRecognizer setMaximumNumberOfTouches:1];
[panRecognizer setDelegate:self];
[imageview addGestureRecognizer:panRecognizer];
[self.view addSubview:imageview]; }
I can even save the view like so:
NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[NSKeyedArchiver archivedDataWithRootObject:imageview] forKey:#"imageViewSaved"];
Now my question: The following method saves only the last imageview added to the screen. Anyone know how to save all of the imageviews that are on the screen...if the user adds more than one?

Answer 1

I really don't think you want to be saving the entire UIImageView object to the user defaults. Instead, try saving a list of UIImage objects, which will be much more lightweight. (And which make much more sense to serialize.)
You can do this like so:
NSUserDefaults *defs = [NSUserDefaults standardUserDefaults];
NSArray *savedArray = [defs objectForKey:#"SAVED_IMAGES"];
// Create a mutable version in case the serialized copy is an NSArray
NSMutableArray *mutableImages = savedArray ? [NSMutableArray arrayWithArray:savedArray] : [NSMutableArray array];
[mutableImages addObject:image];
[defs setObject:mutableImages forKey:#"SAVED_IMAGES"];
[defs save];

Answer 2

To distinguish the UIImageViews on the screen you can do the following.
Define the start ImageView Tag number
#define kImageViewTag 3000
Define an instance var for number of images added to the screen.
NSUInteger numberOfImage = 0
Whenever you create a new UIImageView, increase the count and add it with the kImageViewTag and assign it to the tag property.
imageview = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
imageview.userInteractionEnabled = YES;
[imageview setImage:image];
numberOfImage += 1;
imageView.tag = kImageViewTag + numberOfImage;
Whenever you enumerate the screen subviews, if the class is UIImageView with the tag >= kImageViewTag, you know those are the images added to the screen from the UIImagePickerController.