UIButton is not responding when added to a UIImageView

Question

I'm trying to add a button to a UIImageView with a transparent background - the button is shown ok but is not responding. (takePictureClicked is not called)

My code:

cameraController = [[UIImagePickerController alloc] init];
cameraController.sourceType = UIImagePickerControllerSourceTypeCamera;
cameraController.delegate = self;
cameraController.allowsEditing=YES;
cameraController.showsCameraControls = NO;
cameraController.navigationBarHidden = YES;
cameraController.toolbarHidden = YES;
// overlay on top of camera lens view
UIImageView *cameraOverlayView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"camera_overlay.png"]];
cameraOverlayView.alpha = 0.0f;
//Take picture button
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
UIImage *btnImage = [UIImage imageNamed:@"714-camera.png"];
[button setImage:btnImage forState:UIControlStateNormal];
[button addTarget:self action:@selector(takePictureClicked) forControlEvents:UIControlEventTouchUpInside];
button.frame = CGRectMake(cameraOverlayView.center.x-16,cameraOverlayView.frame.size.height,32,32);
[cameraOverlayView addSubview:button];
[cameraOverlayView setUserInteractionEnabled:YES];
[cameraOverlayView bringSubviewToFront:button];
cameraController.cameraOverlayView = cameraOverlayView;

Answer 1

Normally you create a UIView where you can add different ui elements like UIButton or UIImageView . An UIImageView is just for UIImages and not for adding any other stuff on it. Create another UIView which will hold all the elements in it.

Like this post describes , even Interface Builder doesn't allow you to add a UIButton to an UIImageView .

Answer 2

You have to able the user interaction:

[cameraOverlayView setUserInteractionEnabled:YES];

You have also the checkbox in Interface Builder if you are using it.

This is needed because for default , the UIImageView has the user interaction disabled .

Answer 3

Have you tried setting userInteractionEnabled to the UIImageView ?

try with:

cameraOverlayView.userInteractionEnabled = YES;