Trying to save/load image in app error NSInvalidArgumentException - xcode

Question

Im trying to save and load an image picked from camera roll within my app. I get an error when I press either the load or save button
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImageView CGImage]: unrecognized selector sent to instance 0xe637640'
any thoughts?
AppDelagate .m
- (NSURL *)applicationDocumentsDirectory
{
return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory i nDomains:NSUserDomainMask] lastObject];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
.m of class im trying to save/load image
- (IBAction)save:(id)sender {
UIImage *myImage = imageView;
NSData *data = UIImagePNGRepresentation(myImage);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *appDocsDirectory = [paths objectAtIndex:0];
}
- (IBAction)load:(id)sender {
UIImage *myImage = imageView;
NSData *data = UIImagePNGRepresentation(myImage);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *appDocsDirectory = [paths objectAtIndex:0];
UIImage* thumImage = [UIImage imageWithContentsOfFile: [NSString stringWithFormat:#"%#/%#.png", appDocsDirectory, #"myNewFile"]];
}

Answer 1

this error means that message CGImage is sent to object of type UIImageView, but UIImageView does not response to it. The problem is seemed to be in
UIImage *myImage = imageView;
You do not write properly implementation of imageView, so I can not say exactly, but I assume that imageView is UIImageView, which is subclass of UIView, and you are assigning it to UIImage. Try
UIImage *myImage = [imageView image];
instead. I think that should works))
by the way, why do you need first and second strings of code in -load? They are unnecessary:
- (IBAction)load:(id)sender {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *appDocsDirectory = [paths objectAtIndex:0];
UIImage* thumImage = [UIImage imageWithContentsOfFile: [NSString stringWithFormat:#"%#/%#.png", appDocsDirectory, #"myNewFile"]];
}