ios – 在MKPolyline上检测触摸手势

在我的应用程序中,我有一个带有几个MKGeodesicPolylines的MapView.我希望能够识别这些线上的触摸手势.
使用以下内容添加叠加层：

[_mapView addOverlay：polyline];

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id < MKOverlay >)overlay
{
    if ([overlay class] == [MKGeodesicPolyline class])
    {
        MKPolylineRenderer *renderer = [[[MKPolylineRenderer alloc] initWithPolyline:overlay] autorelease];
        renderer.lineWidth = 4.0;
        renderer.strokeColor = [UIColor blackColor];
        return renderer;
    }
 return nil;
}

我试过WildcardGestureRecognizer应该符合我的目的.这是我正在使用的代码：

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {

        .... MapView init ....

        WildcardGestureRecognizer * tapInterceptor = [[WildcardGestureRecognizer alloc] init];
        tapInterceptor.touchesBeganCallBACk = ^(NSSet * touches,UIEvent * event) {
            UITouch *touch = [touches anyObject];
            CGPoint point = [touch LOCATIOnInView:_mapView];

            CLLOCATIOnCoordinate2D coord = [_mapView convertPoint:point toCoordinateFromView:self.mapView];
            MKMapPoint mapPoint = MKMapPointForCoordinate(coord);
            for (id overlay in _mapView.overlays)
            {
                if ([overlay isKindOfClass:[MKGeodesicPolyline class]])
                {
                    MKGeodesicPolyline *poly = (MKGeodesicPolyline*) overlay;
                    id view = [_mapView viewForOverlay:poly];

                    NSLog(@"view class: %@",[view class]);

                    if ([view isKindOfClass:[MKPolylineRenderer class]])
                    {
                        MKPolylineRenderer *polyView = (MKPolylineRenderer*) view;
                        CGPoint polygonViewPoint = [polyView pointForMapPoint:mapPoint];
                        BOOL mapCoordinateIsInPolygon = CGPathContainsPoint(polyView.path,NULL,polygonViewPoint,NO);
                        if (mapCoordinateIsInPolygon) {
                            NSLog(@"hit!");
                        } else {
                            NSLog(@"miss!");
                        }
                    }

                }
            }

        };
        [_mapView addGestureRecognizer:tapInterceptor];
    }
    return self;
}

问题是上面代码调用第一个Log的地方.该类似乎总是返回null.日志输出：

2014-01-06 13：50：41.106 App [11826：60b] view class：(null)

我希望有人能指出我正确的方向.
非常感谢提前！

工作代码：

我让它为我工作.希望它可以帮助其他人：

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {

        .... MapView init ....

        WildcardGestureRecognizer * tapInterceptor = [[WildcardGestureRecognizer alloc] init];
        tapInterceptor.touchesBeganCallBACk = ^(NSSet * touches,UIEvent * event) {

            CGPoint point = [tapInterceptor LOCATIOnInView:_mapView];

            CLLOCATIOnCoordinate2D coord = [_mapView convertPoint:point toCoordinateFromView:self.mapView];
            MKMapPoint mapPoint = MKMapPointForCoordinate(coord);
            for (id overlay in _mapView.overlays)
            {
                if ([overlay isKindOfClass:[MKGeodesicPolyline class]])
                {
                    MKGeodesicPolyline *poly = (MKGeodesicPolyline*) overlay;
                    id view = [_mapView viewForOverlay:poly];

                    NSLog(@"view class: %@",[view class]);

                    if ([view isKindOfClass:[MKPolylineRenderer class]])
                    {
                        MKPolylineRenderer *polyView = (MKPolylineRenderer*) view;
                        [polyView invalidatePath];

                        CGPoint polygonViewPoint = [polyView pointForMapPoint:mapPoint];

                        BOOL mapCoordinateIsInPolygon = CGPathContainsPoint(polyView.path,NO);

                            if (mapCoordinateIsInPolygon)
                            {
                                NSLog(@"hit!");
                            } else {
                                NSLog(@"miss!");
                            }

                    }

                }
            }

        };
        [_mapView addGestureRecognizer:tapInterceptor];
    }
    return self;
}

替代方案：

添加UITapGestureRecognizer：

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@SELEctor(handleGesture:)];
[_mapView addGestureRecognizer:recognizer];
[recognizer release];

处理手势：

- (void)handleGesture:(UIGestureRecognizer *)recognizer
{

if (recognizer.state == UIGestureRecognizerStateEnded)
{
    for (int i=0; i<recognizer.numberOfTouches; i++)
    {
        //CGPoint point = [recognizer LOCATIOnInView:_mapView];
        CGPoint point = [recognizer LOCATIOnOfTouch:i inView:_mapView];

        CLLOCATIOnCoordinate2D coord = [_mapView convertPoint:point toCoordinateFromView:self.mapView];
        MKMapPoint mapPoint = MKMapPointForCoordinate(coord);

        for (id overlay in _mapView.overlays)
        {
            if ([overlay isKindOfClass:[MKGeodesicPolyline class]])
            {
                MKGeodesicPolyline *poly = (MKGeodesicPolyline*) overlay;
                id view = [_mapView rendererForOverlay:poly];

                if ([view isKindOfClass:[MKPolylineRenderer class]] && [[poly title] isEqualToString:@"fullRouteAbove"])
                {

                    MKPolylineRenderer *polyView = (MKPolylineRenderer*) view;
                    [polyView invalidatePath];

                    CGPoint polygonViewPoint = [polyView pointForMapPoint:mapPoint];
                    NSLog(@"polyView: %@",polyView);
                    BOOL mapCoordinateIsInPolygon = CGPathContainsPoint(polyView.path,NO);

                    if (mapCoordinateIsInPolygon)
                    {
                        NSLog(@"hit!");
                    }else{
                        NSLog(@"miss!");
                    )

                }

            }
        }


    }

}
}

在可触摸区域之间切换：

更换

BOOL mapCoordinateIsInPolygon = CGPathContainsPoint(polyView.path,NO);

同

BOOL mapCoordinateIsInPolygon = CGRectContainsPoint(CGPathGetBoundingBox(polyView.path),polygonViewPoint);

要么

BOOL mapCoordinateIsInPolygon = CGRectContainsPoint(CGPathGetPathBoundingBox(polyView.path),polygonViewPoint);

UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] init];
gr.numberOfTapsrequired = 1;
gr.numberOfTouchesrequired = 1;
gr.delegate = self;
[gr addTarget:self action:@SELEctor(didTap:)];
[mymapView addGestureRecognizer:gr];

- (void)didTap:(UITapGestureRecognizer *)gr
{
    if (gr.state == UIGestureRecognizerStateEnded)
    {
        // convert the touch point to a CLLOCATIOnCoordinate & geocode
        CGPoint touchPoint = [gr LOCATIOnInView:mymapView];
        MKPolylineView *touchedPolyLineView = [self polylineTapped:touchPoint];
        if (touchedPolyLineView)
        {
            //touched a polyLineView
        }
    }
}

- (MKOverlayView*)mapView:(MKMapView*)theMapView viewForOverlay:(id <MKOverlay>)overlay
{ 
    if([overlay isKindOfClass:[MKPolyline class]]){
        //create your polyLineView
        [arrPolylineViews addObject:polyLineView];
    }
}

- (MKPolylineView *)polylineTapped:(CGPoint)point
{
    // check if the overlay got tapped
    for (MKPolylineView *polyView in arrPolylineViews)
    {
        // Get view frame rect in the mapView's coordinate system
        CGRect viewFrameInMapView = [polyView.superview convertRect:polyView.frame toView:mymapView];

        // check if the touch is within the view bounds
        if (CGRectContainsPoint(viewFrameInMapView,point))
        {
            return polyView;
        }
    }
    return nil;
}

[arrPolylineViews removeAllObjects];