How to add overlay to image picker in iOS - ios

Question

I am trying to add an overlay to image taken with imagePicker such as a frame, shown during snap taking. I was trying to use the following code:
self.picker = [[UIImagePickerController alloc] init];
self.picker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.picker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
self.picker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
self.picker.showsCameraControls = NO;
self.picker.navigationBarHidden = YES;
self.picker.toolbarHidden = YES;
self.picker.wantsFullScreenLayout = YES;
// Insert the overlay
self.overlay = [[OverlayViewController alloc] initWithNibName:#"Overlay" bundle:nil];
self.overlay.pickerReference = self.picker;
self.picker.cameraOverlayView = self.overlay.view;
self.picker.delegate = self.overlay;
[self presentModalViewController:self.picker animated:NO];
But this helps when changing the image picker skin. How can I add and process an overlay with the snapshot?

Answer 1

If you need to merge a picture taken with another UIImageView that contains an image, here's a useful snippet:
yourFile.h:
UIImage *combinedImage;
yourFile.m:
-(void)savePicture { // call this method from an IBAction button
// Crop a Combined Image from the taken picture
CGRect rect = [_imagePreview bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
// Render both images, the captured one from the camera and the UIImageView that is over that picture
[__myCapturedImage.layer renderInContext:UIGraphicsGetCurrentContext()];
[_overlayImageView.layer renderInContext:UIGraphicsGetCurrentContext()];
combinedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
_myCapturedImage.image = combinedImage;
// Automatically Save the Image into Photo Album (if you want to do so)
UIImageWriteToSavedPhotosAlbum(combinedImage, nil, nil, nil);
}
Hope this helps!
PS: we have made a nice template that actually processes overlays images (which are frames around images) here: http://codecanyon.net/item/picshape-frame-image-editor-full-app-template/7852895?ref=fvimagination
Cheers!