Subviews do not respond to touches in ScrollView - ios

Question

I have a UIImageView and a UIView (filled with smaller imageviews) all placed in a UIScrollView (for zooming).
To better help you understand, I have a map (ImageView) with fog(UIView with smaller imageviews) in the scrollview so I can zoom the map.
If I add the mapview and fogview to the self.view then the application works as it should, touching the fog at a point removes that fog image.
However, when I add the map and fog views to the scrollview nothing responds to touches.
I ultimately want the default behavior to be touching fog view will remove the fog at one point. Unless the user presses a button to zoom/pinch the view, which will zoom both the mapview and fogview.
The problem below is no touches are processed when I add the mapview and fogview to the scrollview. Currently there is no ability to press a button to pinch/zoom as I still don't have the default behavior I want.
Any help?
#interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIActionSheetDelegate, UIGestureRecognizerDelegate, UIScrollViewDelegate>{
UIImage * fogImage;
NSUserDefaults * defaults;
bool canZoom;
}
#property (weak, nonatomic) IBOutlet UIButton *btnTakePicture;
#property (strong, nonatomic) UIButton * btnMenu;
#property (strong, nonatomic) UIButton * btnZoom;
#property (strong, nonatomic) UIScrollView* scrollView;
#property (strong, nonatomic) UIImageView *mapView;
#property (strong, nonatomic) UIView * fogView;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
fogImage = [UIImage imageNamed:#"fog1.jpg"];
self.mapView = [[UIImageView alloc] initWithFrame:CGRectZero];
self.fogView = [[UIView alloc] initWithFrame:CGRectZero];
_scrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
_scrollView.delegate = self;
_scrollView.minimumZoomScale = 0.75;
_scrollView.maximumZoomScale = 3.0;
[_scrollView addSubview:self.mapView];
[_scrollView addSubview:self.fogView];
[self.view addSubview:_scrollView];
self.mapView.hidden = YES;
self.fogView.hidden = YES;
self.scrollView.hidden = YES;
defaults = [NSUserDefaults standardUserDefaults];
canZoom = false;
}
- (void) viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
self.mapView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
self.fogView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
self.scrollView.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
}
- (void) zoom:(id)sender{
canZoom = !canZoom;
}
- (void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage *chosenImage = info[UIImagePickerControllerOriginalImage];
self.btnTakePicture.hidden = YES;
self.btnMenu.hidden = NO;
self.btnZoom.hidden = NO;
[picker dismissViewControllerAnimated:YES completion:^(void) {
[self fillScreenWithFog];
self.mapView.image = chosenImage;
self.mapView.contentMode = UIViewContentModeScaleAspectFit;
self.mapView.hidden = NO;
self.fogView.hidden = NO;
_scrollView.hidden = NO;
_scrollView.userInteractionEnabled = YES;
self.scrollView.contentSize = self.mapView.frame.size;
}];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:NULL];
}
#pragma mark Fog Maker
- (void) removeFogAtPoint:(CGPoint)point{
NSLog(#"removeFogAtPoint %#", NSStringFromCGPoint(point));
CGRect fingerRect = CGRectMake(point.x - 5, point.y-5, 10, 10);
for(UIImageView *view in self.fogView.subviews){
CGRect subviewFrame = view.frame;
if(CGRectIntersectsRect(fingerRect, subviewFrame)){
[UIView animateWithDuration:1.25
animations:^{
view.alpha = 0;
}
completion:^(BOOL finished){
[view removeFromSuperview];
}];
}
}
}
- (void) fillScreenWithFog {
// do a loop to fill the screen with fog getNewSquare
}
- (UIImageView*) getNewSquare:(CGRect)frame withTag:(int)tag{
UIImageView * imageView = [[UIImageView alloc] initWithFrame:frame];
imageView.image = fogImage;
imageView.contentMode = UIViewContentModeScaleAspectFill;
return imageView;
}
-(void) touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
NSLog(#"Touches Moved");
CGPoint location = [[touches anyObject] locationInView:self.scrollView];
[self removeFogAtPoint:location];
}
#end