Saving a UIImage to NSUserDefaults - objective-c

Question

So I'm trying to save an image taken from UIImagePickerController to NSUserDefaults so I can open it up in an album I generate, but when I call the delegate method to save the picture, I get the error:
[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '<UIImage: 0x1d0bf0>' of class 'UIImage'. Note that dictionaries and arrays in property lists must also contain only property values.`
The code is as follows:
self.savedPic = [[UIImage alloc] init];
self.savedPic = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
[[NSUserDefaults standardUserDefaults] setValue:self.savedPic forKey:[NSString stringWithFormat:#"image_%i",imageCount]];

Answer 1

You should save to disk your image and put the name of your image in the NSUserDefaults, then when needed create it :
[UIImage imageNamed:#"nameOfImage.png"]

Answer 2

It is quite simple, see my codes:
- (UIImage *)backgroundImage {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData* myEncodedImageData = [defaults objectForKey:#"backgroundImageData"];
UIImage* image = [UIImage imageWithData:myEncodedImageData];
return image;
}
- (void)setBackgroundImage:(UIImage *)image {
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSData* imageData = UIImagePNGRepresentation(image);
[defaults setObject:imageData forKey:#"backgroundImageData"];
[defaults synchronize];
}