drawing image in cameraOverlayView - ios

Question

I'm using this code to create a UIImagePickerController with a custom cameraOverlayView. For testing purposes, the overlay's just supposed to be a circle that I draw in CircleView using a UIBezierPath. However, the circle drawn in the CircleView is not appearing in the overlay. The overlay is supposed to be a subclass of UIView which my CircleView is. Can you explain why the circle is not appearing when the overlay pops up? I initialize the circleView in viewDidLoad and then set it to be the cameraOverlayView in viewDidAppear.
viewController
#property (strong, nonatomic) CircleView *overlay;
viewDidLoad
self.overlay = [[CircleView alloc] init];
viewDidAppear
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.allowsEditing = YES;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.showsCameraControls = NO;
picker.navigationBarHidden = YES;
picker.wantsFullScreenLayout = YES;
picker.cameraOverlayView = self.overlay;
picker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
[self presentViewController:picker animated:YES completion:NULL];
}
CircleView
- (id)initWithCoder:(NSCoder *)aDecoder {
if (self = [super initWithCoder:aDecoder]) {
self.shape = [UIBezierPath bezierPathWithOvalInRect:(CGRectMake(0, 50, 50, 50))];
}
return self;
}
- (void)drawRect:(CGRect)rect{
[[UIColor colorWithRed: (114/255.0) green: (5/255.0) blue:(46/255.0) alpha:1] setFill];
[self.shape fill];
}

Answer 1

There are two problems here:
Your circle overlay view has zero size, because you create it with init instead of initWithFrame: (init falls back on a frame of {0,0,0,0}, because you have provided no frame information).
Your circle overlay view does some important initialization in initWithCoder:, but this method is never called, since you are instantiating it with init instead. Thus its self.shape is nil and nothing is drawn in its drawRect:.