Making a method save a UIImage to the photo library - ios

Question

I'm attempting to write an application that shows the camera feed, and you can take an image from it. I've successfully set up a UIButton and a linked action method (IBAction) but I'm having trouble making it trigger the UI to save the picture. I have it all set up so when everything goes correctly it should inform the user, but instead it crashes. Any insight would be greatly appreciated.
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(applicationDidBecomeActive)
name:UIApplicationDidBecomeActiveNotification
object:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self
name:UIApplicationDidBecomeActiveNotification
object:nil];
}
- (void)applicationDidBecomeActive
{
//Start the camera up
UIImagePickerController *imageViewPickerController = [[UIImagePickerController alloc] init];
//Hide default UI elements
imageViewPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
imageViewPickerController.showsCameraControls = NO;
imageViewPickerController.navigationBarHidden = YES;
imageViewPickerController.toolbarHidden = YES;
//Start the button overlay
UIView *btnView = [[UIView alloc] initWithFrame:imageViewPickerController.view.bounds];
btnView.opaque = NO;
btnView.clipsToBounds = YES;
//Start up the button
UIButton *snapButton = [[UIButton alloc] initWithFrame:CGRectMake(-6, 504, 65, 65)];
snapButton.alpha = 0.5;
snapButton.transform = CGAffineTransformMakeRotation(DEGREES_RADIANS(90));
[snapButton addTarget:snapButton action:#selector(takePhoto:) forControlEvents:UIControlEventTouchUpInside];
//Set the button's picture
UIImage *snapButtonImage = [UIImage imageNamed:#"Button.png"];
[snapButton setImage:snapButtonImage forState:UIControlStateNormal];
//Add button to the overlay
[btnView addSubview:snapButton];
//Overlay button view
imageViewPickerController.cameraOverlayView = btnView;
//Fix for iPhone 5 and make fullscreen
CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, -55.0);
CGAffineTransform scale = CGAffineTransformMakeScale(1.333333, 1.333333);
CGAffineTransform rotate = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));
CGAffineTransform transform = CGAffineTransformConcat(translate, scale);
transform = CGAffineTransformConcat(transform, rotate);
imageViewPickerController.cameraViewTransform = transform;
//Let's present it all
[self presentViewController:imageViewPickerController
animated:NO
completion:NULL];
}
- (IBAction)takePhoto:(id)sender {
[UIImagePickerController takePicture];
}
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Access the uncropped image from info dictionary
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
// Save image
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
UIAlertView *alert;
// Unable to save the image
if (error)
alert = [[UIAlertView alloc] initWithTitle:#"Error"
message:#"Unable to save image to Photo Album."
delegate:self cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
else // All is well
alert = [[UIAlertView alloc] initWithTitle:#"Success"
message:#"Image saved to Photo Album."
delegate:self cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
}
EDIT:
Revised code to resolve exception.
- (void)applicationDidBecomeActive
{
//Start the camera up
_imageViewPickerController = [[UIImagePickerController alloc] init];
//Hide default UI elements
_imageViewPickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
_imageViewPickerController.showsCameraControls = NO;
_imageViewPickerController.navigationBarHidden = YES;
_imageViewPickerController.toolbarHidden = YES;
//Start the button overlay
UIView *btnView = [[UIView alloc] initWithFrame:_imageViewPickerController.view.bounds];
btnView.opaque = NO;
btnView.clipsToBounds = YES;
//Start up the button
UIButton *snapButton = [[UIButton alloc] initWithFrame:CGRectMake(-6, 504, 65, 65)];
snapButton.alpha = 0.5;
snapButton.transform = CGAffineTransformMakeRotation(DEGREES_RADIANS(90));
[snapButton addTarget:snapButton action:#selector(snapThat) forControlEvents:UIControlEventTouchUpInside];
//Set the button's picture
UIImage *snapButtonImage = [UIImage imageNamed:#"Button.png"];
[snapButton setImage:snapButtonImage forState:UIControlStateNormal];
//Add button to the overlay
[btnView addSubview:snapButton];
//Overlay button view
_imageViewPickerController.cameraOverlayView = btnView;
//Fix for iPhone 5 and make fullscreen
CGAffineTransform translate = CGAffineTransformMakeTranslation(0.0, -55.0);
CGAffineTransform scale = CGAffineTransformMakeScale(1.333333, 1.333333);
CGAffineTransform rotate = CGAffineTransformMakeRotation(DEGREES_RADIANS(180));
CGAffineTransform transform = CGAffineTransformConcat(translate, scale);
transform = CGAffineTransformConcat(transform, rotate);
_imageViewPickerController.cameraViewTransform = transform;
//Let's present it all
[self presentViewController:_imageViewPickerController
animated:NO
completion:NULL];
}
- (void)snapThat {
[_imageViewPickerController takePicture];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
// Access the uncropped image from info dictionary
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
// Save image
UIImageWriteToSavedPhotosAlbum(image, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
{
UIAlertView *alert;
// Unable to save the image
if (error)
alert = [[UIAlertView alloc] initWithTitle:#"Error"
message:#"Unable to save image to Photo Album."
delegate:self cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
else // All is well
alert = [[UIAlertView alloc] initWithTitle:#"Success"
message:#"Image saved to Photo Album."
delegate:self cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alert show];
}
EDIT 2: Including headers
#interface TurnikitViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate>
#property (strong, nonatomic) IBOutlet UIView *imageView;
#property (strong, nonatomic) UIImagePickerController *imageViewPickerController;
#end

Answer 1

You should have this as property:
#property (strong, nonatomic) UIImagePickerController *imageViewPickerController;
then you init that as you are doing:
_imageViewPickerController = [[UIImagePickerController alloc] init];
and when you save:
[_imageViewPickerController takePicture];
Instead now, you are not calling the method on the instance, but on the class..that is an error:
[UIImagePickerController takePicture];
And also, you are adding as target of your button, itself..instead the target is self:
[snapButton addTarget:self action:#selector(snapThat) forControlEvents:UIControlEventTouchUpInside];