在MKMapView上刷新MKAnnotationView

问题描述

我想为我的自定义MKAnnotationView异步加载图像；我已经在使用EGOImageView-framework(它与UITableViews配合得很好)，但是我无法使其在MKMapView上工作.图片似乎已加载，但我无法在地图上刷新它们-[myMap setNeedsDisplay]不执行任何操作.

I'd like to a-synchronically load images for my custom MKAnnotationView; I'm already using the EGOImageView-framework (it goes very well with UITableViews), but I fail to make it work on MKMapView. Images seem to be loaded, but I cannot refresh them on the map - [myMap setNeedsDisplay] does nothing.

推荐答案

我自己还没有尝试过，但它可能会起作用:
使用MKMapView - (MKAnnotationView *)viewForAnnotation:(id <MKAnnotation>)annotation方法获取注释视图，并为其设置新图像.

I haven't tried it myself, but it might work:
Get a view for annotation using MKMapView - (MKAnnotationView *)viewForAnnotation:(id <MKAnnotation>)annotation method and set new image to it.

我自己尝试过这种方法，这种方法对我来说很有效:

Tried to do that myself and this approach worked fine for me:

//  Function where you got new image and want to set it to annotation view
for (MyAnnotationType* myAnnot in myAnnotationContainer){
    MKAnnotationView* aView = [mapView viewForAnnotation: myAnnot];
    aView.image = [UIImage imageNamed:@"myJustDownloadedImage.png"];
}

调用此方法后，所有注释图像均已更新.

After calling this method all annotations images were updated.

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