MKAnnotationView具有自定义视图和图像视图 [英] MKAnnotationView with custom view and image view

问题描述

在我的地图应用程序中，我想要显示带有图像的彩色背景圆圈，而不是显示图钉。背景的颜色（下图中的绿色阴影）圆是动态的。它将如下图所示：

In my Map application, instead of showing a pin, I want to show a colored background circle with image in it. The color of the background (which is shade of green in below image) circle is dynamic. It will look as in below image:

我创建了TCircleView，它在drawRect中绘制颜色


显示类似的注释，我创建了TCircleView和UIImageView的对象，并将它们添加到MKAnnotationView对象。它看起来很好并且可以看到预期。


但它不允许检测点击/触摸以显示呼叫。

I created TCircleView which draws the color in "drawRect"

To show similar annotation, I created object of TCircleView and UIImageView and add them to MKAnnotationView object. Its looking good and visible as expected.

But its not allowing to detect tap/touch to show the call out.

我' m使用以下代码：

I'm using the below code:

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

    if ([annotation isKindOfClass:[MKPointAnnotation class]]) {
        return nil;
    }

    static NSString *annotationIdentifier = @"StickerPin";

    MKAnnotationView *annotationView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];

    if (!annotationView) {
        annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationIdentifier];
        annotationView.canShowCallout = YES;
    }

    TCircleView* circleView = [[TCircleView alloc] init];
    circleView.green = [postObj[@"severity"] floatValue]; //dynamic value coming from server

    UIImageView* imgView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Piano"]];

    CGRect r = imgView.frame;
    r.size.height = r.size.width = 60;
    imgView.frame = r;
    circleView.frame = r;

    [annotationView addSubview:circleView];
    [annotationView addSubview:imgView];

    return annotationView;
}

它不允许显示标注甚至不调用委托didSelectAnnotationView：


如何在地图上将自定义视图显示为注释？

Its not allowing to show the callout or not even calling the delegate "didSelectAnnotationView:"
How to show the custom view as annotation on the map?

推荐答案

我创建了一个注释视图的子类并实现了它。代码如下：

I created a sub class of annotation view and achieved it. The code is below:

@interface TStickerAnnotationView : MKAnnotationView

@property(nonatomic) float stickerColor;

@end

@interface TStickerAnnotationView () {
    UIImageView *_imageView;
    TCircleView *_circleView;
}


@end

@implementation TStickerAnnotationView

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // make sure the x and y of the CGRect are half it's
        // width and height, so the callout shows when user clicks
        // in the middle of the image
        CGRect  viewRect = CGRectMake(-30, -30, 60, 60);

        TCircleView* circleView = [[TCircleView alloc] initWithFrame:viewRect];
        _circleView = circleView;
        [self addSubview:circleView];

        UIImageView* imageView = [[UIImageView alloc] initWithFrame:viewRect];

        // keeps the image dimensions correct
        // so if you have a rectangle image, it will show up as a rectangle,
        // instead of being resized into a square
        imageView.contentMode = UIViewContentModeScaleAspectFit;

        _imageView = imageView;

        [self addSubview:imageView];



    }
    return self;
}

- (void)setImage:(UIImage *)image
{
    // when an image is set for the annotation view,
    // it actually adds the image to the image view
    _imageView.image = image;
}

- (void)stickerColor:(float)color {
    _circleView.green = color;
    [_circleView setNeedsDisplay];
}

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