camera overlay view - just for preview?

Question

I've noticed that in OS 3.1 you can add an overlay view to the image picker with

cameraOverlayView

However, I've also noticed that adding a view via this method also displays the view for the entire time the UIImagePicker is displayed, when I only want to show it during the preview stage.

Is there a way to make this only happen during preview? I don't want it to be there during the open shutter animation, or the screen that asks whether you want to use the image or retake.

Answer 1

I just wanted to show up another possibility without subview fiddling. There are system notifications for the changes in the CameraPicker. They are not documented either (as the subview structure). So they are also subject to change. BUT you get them.

You can register for them using no name:

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(notificationReceived:) name: nil object: nil];

We get some interesting (selfexplaining) notifications here:

PLCameraControllerPreviewStartedNotification
PLCameraViewIrisAnimationWillBeginNotification
PLCameraViewIrisAnimationDidEndNotification

Recorder_DidStartPreviewing
Recorder_SourceStarted
Recorder_WillCapturePhoto
Recorder_DidCapturePhoto
Recorder_PhotoStillImageSampleBufferReady
Recorder_DidStopPreviewing

_UIImagePickerControllerUserDidCaptureItem // Photo was taken, preview is shown
_UIImagePickerControllerUserDidRejectItem  // Repeat was pressed, camera is shown again 

You could use them, to trigger your overlayviews hidden state or anything else.