如何设置我的地图 MKAnnotation CalloutAccessoryView 以显示从我的领域数据库映射出的选定图像(两侧都有图标和按钮,作为左右 calloutAccessory?)。我还需要它来识别我的 MapViewController 上其他功能的类/成员吗?数据和左右标注附件的映射工作正常,但我不知道如何添加所选图像,因此它在标注上显示为大海报风格的图像(带有小图标和按钮两边)。
图像是 SpecimenAnnotation.objectPoster
SpecimenAnnotation(可以很好地映射数据)和“objectPoster”值是从 Specimen 类中选择(和映射)的注释,包含在我的文件 Specimen.swift 中,如下所示;
class Specimen: Object{
dynamic var name = ""
dynamic var objectPoster = ""
dynamic var latitude = 0.0
dynamic var longitude = 0.0
dynamic var created = NSDate()
dynamic var category: Category!
}
在我的 MapViewController 中,'annotationView.detailCalloutAccessoryView = UIImageView(image: SpecimenAnnotation.objectPoster)' 行我收到红色警报错误“实例成员 'objectPoster' 不能用于类型 'Specimen Annotation'
我是初学者。非常感谢您的建议。有任何想法吗?
以下是有关此数据和错误的代码块:
// Create annotations for each one
for specimen in specimens { // 3
let coord = CLLocationCoordinate2D(latitude: specimen.latitude, longitude: specimen.longitude);
let specimenAnnotation = SpecimenAnnotation(coordinate: coord, poster: specimen.objectPoster, subtitle: specimen.category.name, specimen: specimen)
mapView.addAnnotation(specimenAnnotation) // 4
}
}
}
//MARK: - MKMapview Delegate
extension MapViewController: MKMapViewDelegate {
func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
guard let subtitle = annotation.subtitle! else { return nil }
if (annotation is SpecimenAnnotation) {
if let annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(subtitle) {
return annotationView
} else {
let currentAnnotation = annotation as! SpecimenAnnotation
let annotationView = MKAnnotationView(annotation: annotation, reuseIdentifier: subtitle)
annotationView.image = UIImage(named:"IconStudent")
annotationView.enabled = true
annotationView.canShowCallout = true
// ERROR message here>
annotationView.detailCalloutAccessoryView = UIImageView(image: SpecimenAnnotation.objectPoster)
// right accessory view
let infoButton = UIButton(type: UIButtonType.InfoDark)
// Left accessory view
let image = UIImage(named: "button50")
let specimenButton = UIButton(type: .Custom)
specimenButton.frame = CGRectMake(0, 0, 30, 30)
specimenButton.setImage(image, forState: .Normal)
annotationView.rightCalloutAccessoryView = infoButton
annotationView.leftCalloutAccessoryView = specimenButton
if currentAnnotation.title == "Empty" {
annotationView.draggable = true
}
return annotationView
}
}
return nil
}