在mkannotationview中替换calloutaccessoryview

我会考虑删除并重新添加您的注释。它看起来有点笨手笨脚,但可能管用。

我遇到了一个类似的问题——如果有一个与注释相关联的图像,我需要为LeftCalloutAccessoryView显示一个图像。尝试在mappview:didselectannotationview而不是mappview:viewforannotation中设置它

-(void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)annotView
{
    ...

    if(imgURL.length>1){            
        // set a thread that will load the image 
        // but don't set the leftCalloutAccessoryView until the image is loaded 
        dispatch_queue_t downloader = dispatch_queue_create("annotation image downloader",NULL);
        dispatch_async(downloader, ^{
            NSURL* photoURL = [NSURL URLWithString:imgURL];
            NSData* photoData = [NSData dataWithContentsOfURL:photoURL];
            UIImage* photoImage = [UIImage imageWithData:photoData];
            dispatch_async(dispatch_get_main_queue(), ^{
                annotView.leftCalloutAccessoryView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 32, 32)];
                [(UIImageView *) annotView.leftCalloutAccessoryView setImage:photoImage];
            });                
        });
    }
}