MKAnnotationView标注附件

Question

我正在尝试实现一个带有自定义标注视图的自定义注释。我已经成功地将两者集成到我的应用程序中，如下所示：

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我已经在一个xib文件中创建了我的自定义标注视图：

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但是，当用户缩放/拖动地图时，我的标注视图停留在屏幕上的同一位置，而地图和注释位于新位置：

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我想知道如何才能使标注视图保持在注释之上，即使地图被移动、旋转或拖动。我的标注视图的代码可以在下面找到：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
    if ([annotation isKindOfClass:[MKUserLocation class]])
    {
        return nil;  //return nil to use default white dot view
    }

    if ([annotation isKindOfClass:[FishAnnotation class]])
    {
        static NSString *reuseId = @"seafoodRestaurant";
        MKAnnotationView *annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:reuseId];

        if (annotationView == nil)
        {
            annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId];
        }
        else
        {
            annotationView.annotation = annotation;
        }

        FishAnnotation *ann = (FishAnnotation *)annotation;
        annotationView.image = [UIImage imageNamed:ann.imageName];
        annotationView.draggable = YES;
        annotationView.canShowCallout = NO;

        return annotationView;
    }

    //return nil (default view) if annotation is not our custom type
    return nil;
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{

        CalloutView *calloutView = (CalloutView *)[[[NSBundle mainBundle] loadNibNamed:@"calloutView" owner:self options:nil] objectAtIndex:0];

        CGRect calloutViewFrame = calloutView.frame;

        calloutViewFrame.origin = CGPointMake(view.frame.origin.x - calloutView.frame.size.width/2 + 18, view.frame.origin.y-calloutView.frame.size.height);
        calloutView.frame = calloutViewFrame;
        FishAnnotation *annotation = view.annotation;

        [calloutView setTitle:@"Seafood Restaurant!" subTitle:@"647-123-4567"];

        calloutView.annotation = view.annotation;

        [view.superview addSubview:calloutView];
        [view.superview bringSubviewToFront:calloutView];


}

-(void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view
{
    for (UIView *subview in view.superview.subviews)
    {
        if ([subview isKindOfClass:[CalloutView class]])
        {
            [subview removeFromSuperview];
        }
    }
}

如果有办法将标注视图固定在注释上方，请让我知道。我试着用

        [view addSubview:calloutView];
        [view bringSubviewToFront:calloutView];

但是，如果我尝试这样做，调用视图不会显示(它是隐藏的)，而不是使用view.superview。

Answer 1

我在下面找到了一个临时解决方案。这样做的问题是我的标注视图上的按钮不再起作用。当我选择一个按钮时，标注消失。

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{
    FishAnnotation *annotation = view.annotation;

    // [appleMapView setCenterCoordinate:annotation.coordinate animated:YES];

    if(![view.annotation isKindOfClass:[MKUserLocation class]])
    {
        CalloutView *calloutView = (CalloutView *)[[[NSBundle mainBundle] loadNibNamed:@"calloutView" owner:self options:nil] objectAtIndex:0];

        CGRect calloutViewFrame = calloutView.frame;

        calloutViewFrame.origin = CGPointMake(-calloutView.frame.size.width/2 + 18, -calloutView.frame.size.height);
        calloutView.frame = calloutViewFrame;

        [calloutView setTitle:annotation.title subTitle:annotation.subTitle];

        calloutView.annotation = view.annotation;

        [view addSubview:calloutView];
        [view bringSubviewToFront:calloutView];
    }
}

-(void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view
{
    for (UIView *subview in view.subviews)
    {
        if ([subview isKindOfClass:[CalloutView class]])
        {
            [subview removeFromSuperview];
        }
    }
}

Answer 2

我建议你使用这个库，因为我最近在我的项目中使用过它。

SMCalloutView https://github.com/nfarina/calloutview

它将帮助您处理mapView滚动和平移。

然后，我相信您可以加载customView和addSubView并将其放入SMCalloutView中。