UIImagePickerController - [picker dismissViewControllerAnimated:YES completion:Nil]; Error - ios

Question

I have been trying this for the past 2 days and I am not able to figure out the answer. I have searched all over and I haven't found the answer.
The question is I have a button which brings up the camera in my app(to take photos only). The camera opens up, but when i take a picture and click on "USE"(which is displayed at the bottom right) its crashing. Also, when the camera opens up, before taking a picture when I click "Cancel" it again crashes.
I tried using breakpoints and found out that, When I click on the "USE" button, it crashes in this line
[picker dismissViewControllerAnimated:YES completion:Nil]
I'm testing it in my iPad (iOS6).
Here is the Button Code here :
-(IBAction)getAlbum:(id)sender {
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
NSArray *media = [UIImagePickerController
availableMediaTypesForSourceType: UIImagePickerControllerSourceTypeCamera];
if ([media containsObject:(NSString*)kUTTypeImage] == YES) {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
//picker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
[picker setMediaTypes:[NSArray arrayWithObject:(NSString *)kUTTypeImage]];
picker.delegate = self;
//[self presentModalViewController:picker animated:YES]; //Since [Modal](http://stackoverflow.com/questions/12445190/dismissmodalviewcontrolleranimated-deprecated) has been removed
[self presentViewController:picker animated:YES completion:Nil];
//[picker release];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Unsupported!"
message:#"Camera does not support photo capturing."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Unavailable!"
message:#"This device does not have a camera."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
imagePickerController Method here:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSLog(#"Media Info: %#", info);
NSString *mediaType = [info valueForKey:UIImagePickerControllerMediaType];
if([mediaType isEqualToString:(NSString*)kUTTypeImage]) {
UIImage *photoTaken = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
//Save Photo to library only if it wasnt already saved i.e. its just been taken
if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
UIImageWriteToSavedPhotosAlbum(photoTaken, self, #selector(image:didFinishSavingWithError:contextInfo:), nil);
}
selectedLogoImg.image=photoTaken; //selectedLogoImg is the imageView
[self.clipartItemView addSubview:selectedLogoImg]; // To detect touch and move it I place it as a subview of self.clipartItemView
}
//[picker dismissModalViewControllerAnimated:YES];
[picker dismissViewControllerAnimated:YES completion:Nil]
//[picker release];
//[picker dismissViewControllerAnimated:YES completion:^{
// NSLog(#"Dismiss completed");
//}];
}
didFinishSavingWithError Code Here:
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
UIAlertView *alert;
//NSLog(#"Image:%#", image);
if (error) {
alert = [[UIAlertView alloc] initWithTitle:#"Error!"
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
imagePickerControllerDidCancel Code Here:
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
//[picker dismissModalViewControllerAnimated:YES];
/*[picker dismissViewControllerAnimated:YES completion:^{
[self.view sendSubviewToBack:cardGalleryView];
}];*/
[picker dismissViewControllerAnimated:YES completion:Nil];
}

Answer 1

You should send the dismissViewControllerAnimated:completion: message to the view controller, not the picker. Try:
[self dismissViewControllerAnimated:YES completion:nil];
The above method is only for iOS 6. You need to use [self dismissModalViewControllerAnimated:YES] for iOS 5 and below.
Take a look at the description of the method in the documentation:
Dismisses the view controller that was presented by the receiver.
The presenting view controller is responsible for dismissing the view
controller it presented. If you call this method on the presented view
controller itself, however, it automatically forwards the message to
the presenting view controller

Answer 2

This problem is due to your UIImagePickerController *picker object . ViewController isn't able to identify your picker object reference out of the getAlbum method scope.
1.> you can create UIImagePickerController object in your .h file
#interface yourViewController : UIViewController <UIImagePickerControllerDelegate,UINavigationControllerDelegate,UINavigationControllerDelegate,UIPopoverControllerDelegate>
{
UIImagePickerController *picker;
UIPopoverController *popover;
}
and in .m file you just use it inside getAlbum IBAction method
-(IBAction)getAlbum:(id)sender {
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
NSArray *media = [UIImagePickerController
availableMediaTypesForSourceType: UIImagePickerControllerSourceTypeCamera];
if ([media containsObject:(NSString*)kUTTypeImage] == YES) {
UIButton *btn=(UIButton *)sender;
if ([popover isPopoverVisible])
{
[popover dismissPopoverAnimated:YES];
popover=nil;
}
picker = [[UIImagePickerController alloc]init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[picker setMediaTypes:[NSArray arrayWithObject:(NSString *)kUTTypeImage]];
picker.delegate = self;
popover = [[UIPopoverController alloc] initWithContentViewController:picker];
[popover presentPopoverFromRect:CGRectMake(btn.frame.size.width,btn.frame.size.height/2,1,1) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Unsupported!"
message:#"Camera does not support photo capturing."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Unavailable!"
message:#"This device does not have a camera."
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alert show];
[alert release];
}
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)myimage editingInfo:(NSDictionary *)editingInfo
{
myimage = [myimage fixOrientation];
[picker dismissModalViewControllerAnimated:YES];
[popover dismissPopoverAnimated:YES];
}
I hope it helps you to better understand.