Pass events onto another view - ios

Question

I have a situation in which I would like to place a UIView (that is not my code) on top of another UIView and have events propagated to the bottom most view. To be more concrete I would like to place a UIView on top of a MKMapView.
I have a UIView that contains both the views (as subviews). I would like my uiview to forward on the events from its view to both its subviews.
.h:
#interface MyUIView : UIView
#end
.m:
#import "MyMapView.h"
#import <MapKit/MapKit.h>
#import "MapGestureRecognizer.h"
#implementation MyMapView
MKMapView *mkMapView;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
mkMapView = [[MKMapView alloc] initWithFrame:frame];
[self addSubview:mkMapView];
// Create another view to place on top of the mkMapView
// This is not my view I do not control is codebase. I would like to put it on top of the mkMapView
// and still have the mkMapView receive touch events
UIView * otherView = [[UIView alloc] initWithFrame:frame];
otherView.backgroundColor = [UIColor clearColor];
[self addSubview:otherView];
MapGestureRecognizer *mgr = [[MapGestureRecognizer alloc] init];
mgr.touchesBeganCallback = ^(NSSet * touches, UIEvent * event) {
UITouch *touch = [[event allTouches] anyObject];
NSLog(#"touches began=%#", [NSString stringWithFormat:#"%i", touch.view.tag]);
[mkMapView touchesBegan:touches withEvent:event];
};
mgr.touchesCancelledCallback = ^(NSSet * touches, UIEvent * event) {
UITouch *touch = [[event allTouches] anyObject];
NSLog(#"touches cancelled=%#", [NSString stringWithFormat:#"%i", touch.view.tag]);
[mkMapView touchesCancelled:touches withEvent:event];
};
mgr.touchesEndedCallback = ^(NSSet * touches, UIEvent * event) {
UITouch *touch = [[event allTouches] anyObject];
NSLog(#"touches ended=%#", [NSString stringWithFormat:#"%i", touch.view.tag]);
[mkMapView touchesEnded:touches withEvent:event];
};
mgr.touchesMovedCallback = ^(NSSet * touches, UIEvent * event) {
UITouch *touch = [[event allTouches] anyObject];
NSLog(#"touches moved=%#", [NSString stringWithFormat:#"%i", touch.view.tag]);
[mkMapView touchesMoved:touches withEvent:event];
};
[self addGestureRecognizer:mgr];
return self;
}
#end
I implemented my own gesture recognizer to intercept these events and I am trying to pass to intercepted events through to the mkMapView. I see the log messages however it does not seem to pass the events through as I can make the mkmapview scroll/pan.

Answer 1

The gesture recogniser works with the topmost view if another view is on top of the view with the attached gesture recogniser, the recogniser does not fire off. A quick and dirty way would be to assign the same set of recognisers to otherView and drop them appropriately when not needed. The action need not be performed on the same view that receives the gestures so receiving the pan gestures in Otherviews and then panning the map in the background should work.

Answer 2

change your code to below one->
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
mkMapView = [[MKMapView alloc] initWithFrame:frame];
[self addSubview:mkMapView];
UIView * otherView = [[UIView alloc] initWithFrame:frame];
otherView.backgroundColor = [UIColor clearColor];
[self addSubview:otherView];
return self;
}
-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{
return mkMapView;
}