CameraOverlayView & Touch Focus

{
	UIImagePickerController *controller = [[[UIImagePickerController alloc] init] autorelease];
	controller.sourceType = UIImagePickerControllerSourceTypeCamera;
	controller.cameraOverlayView = self.cameraOverlay;
	[self performSelector:@selector(removeOverlayView:) withObject:controller afterDelay:0.1f];
	controller.allowsEditing = YES;
	controller.delegate = self;
	// ニュッと出るのでは無く、フェードする
	controller.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
	[self presentModalViewController:controller animated:YES];
}
// overlay viewを外すけどlayerツリーは残す
- (void) removeOverlayView:(UIImagePickerController*)controller {
	// overlayの親子を把握する
	CALayer *splayer = self.cameraOverlay.layer.superlayer;
	controller.cameraOverlayView = nil;
	[splayer addSublayer:self.cameraOverlay.layer];
}