Question

我在使用UILongPressGestureRecognizer和可拖动的MKPinAnnotationView时遇到了问题。

我尝试制作的行为类似于地图应用。

可以拖动别针。
长按/敲击时，针脚掉落。

但是，我在MKPinAnnotationView框架外识别长按时遇到问题。如果引脚不可拖动，则按下引脚的长按手势可以正常工作。然而，当引脚可以拖动时，我无法识别长按手势识别器，以便我可以放下引脚。

有什么想法吗？

顺便说一下，我试图设置长按识别器的代理，以便

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

在这种情况下，识别出长按手势并且引脚掉落，但引脚的拖动不再有效。

MapView的片段（MKMapView的子类）

- (id)initWithFrame:(CGRect)frame {

    if (self = [super initWithFrame:frame]) {

    // init the gesture recognizer
        UILongPressGestureRecognizer* lpgr = [[UILongPressGestureRecognizer alloc] 
            initWithTarget:self action:@selector(handleLongPress:)];
        lpgr.minimumPressDuration = 0.5f; //user needs to press for 2 seconds
        lpgr.delegate = self;
        [self addGestureRecognizer:lpgr];
        [lpgr release];

        //add some initial annotation
        Marker *_annotation = [[Marker alloc] initWithCoordinate:_location];
        [_annotation titleWithString:@"some title"];
        [self addAnnotation:_annotation];

    }

    return self;

}

- (void)handleLongPress:(UIGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state != UIGestureRecognizerStateBegan)
    {
        return;
    }

    CGPoint touchPoint = [gestureRecognizer locationInView:self];   
    CLLocationCoordinate2D touchMapCoordinate = [self convertPoint:touchPoint toCoordinateFromView:self];

    // add marker to self-map
    // Marker is subclass of MKAnnotation
    Marker *_annotation = [[Marker alloc] initWithCoordinate:_location];
    [_annotation titleWithString:@"some title"];
    [self addAnnotation:_annotation];

}


- (MKAnnotationView *)mapView:(MKMapView *)mView viewForAnnotation:(id<MKAnnotation>) annotation {

    if([annotation isMemberOfClass:[Marker class]] ) {

        // use MKPinAnnotationView for the view
        MKPinAnnotationView *_pin = (MKPinAnnotationView *) [mView dequeueReusableAnnotationViewWithIdentifier:@"spot_pin"];

        if (_pin == nil)
        {
            _pin = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"spot_pin"] autorelease];
        }
        else
        {
            _pin.annotation = annotation;
        }

        [_pin setDraggable:YES];
        [_pin setSelected:YES animated:YES];
        [_pin setCanShowCallout:YES];

        return _pin;

    } else {

        return nil;

    }

}

Answer 1

好的，我解决了。

显然，当我继承了MKMapView之后，我还添加了一个方法handleLongPress。这种方法显然干扰了MKMapView的handleLongPress方法。

只需将handleLongPress选择器更改为其他名称（如handleLongPress2），就可以使其像地图应用一样工作。

    UILongPressGestureRecognizer* lpgr = [[UILongPressGestureRecognizer alloc] 
        initWithTarget:self action:@selector(handleLongPress2:)];

在MKMapView中使用UILongPressGestureRecognizer和可拖动的MKPinAnnotationView

1 个答案: