Capture picture automatically in IOS

My requirement is to write a sample IOS app that would automatically capture a camera picture. Using the various S.O links provided I did implement the below code -

My CameraViewController.h class is defined as follows :

@interface CameraViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

@property (strong, nonatomic) IBOutlet UIImageView *ImageView;

@end

And CameraViewController.m has the below code :

    -(void)viewDidAppear:(BOOL)animated
{
    NSLog(@"Setting the background now");

    UIImagePickerController *picker = [[UIImagePickerController alloc] init];picker.delegate = self;
    picker.allowsEditing = YES;
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
    picker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
    picker.showsCameraControls = NO;
    picker.navigationBarHidden = NO;
    picker.toolbarHidden = NO;
    [self presentViewController:picker animated:YES completion:NULL];

    NSLog(@"Taking the picture now");
   [picker takePicture];


}


-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{
    NSLog(@"Entered the case of finishing pictures");
}

- (void) imagePickerControllerDidCancel: (UIImagePickerController *) picker
{
    NSLog(@"Entered the case of cancel");

}

What the above code does is successfully launch the camera app , however I am not sure if the takePicture API is able to successfully click a picture . I do not see any saved pictures in the Photos app inside my Ipad so I assume that the picture has not been clicked . Can someone please tell me if my code above is correct or what do I need to do to automate the part of clicking the capture button once the Camera controls are displayed

Solution

[Please go to 'Using UIImagePickerController to Select Pictures and Take Photos' in the Apple documentation for the property cameraOverlayView of class UIImagePickerController for a complete example application that does what you need, and more.]

You specified your CameraViewController as adopting the UIImagePickerControllerDelegate protocol and thus you must implement two messages:

- (void)   imagePickerController: (UIImagePickerController *) picker      
   didFinishPickingMediaWithInfo: (NSDictionary *) info;

and

- (void) imagePickerControllerDidCancel: (UIImagePickerController *) picker;

As the iOS documentation describes, the NSDictionary* info has a key UIImagePickerControllerOriginalImage which will return the UIImage. Access it as something like:

UIImage *snapshot = (UIImage *) [info objectForKey: UIImagePickerControllerOriginalImage];

Since your plan is to take a picture automatically (w/o user interaction) using takePicture then be sure to specify

  picker.showsCameraControls = NO;