Question

我有一个包含4个位置的数组，以及一个包含4个引脚名称的数组（即＆＃34; bluePin.png | redPin.png | etc ...＆＃34;）

目前我使用我在其他地方找到的一些代码将自定义引脚图形添加到所有4个位置，但我的所有引脚都是红色的。

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
    let annotationReuseId = "Truck"
    var trkPin = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationReuseId)
    if trkPin == nil {
        trkPin = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationReuseId)
    } else {
        trkPin!.annotation = annotation
    }
    trkPin!.image = UIImage(named: "redPin.png")
    trkPin!.backgroundColor = UIColor.clearColor()
    trkPin!.canShowCallout = false
    return trkPin
}

如何将引脚颜色与数组中的位置相关联，以便每个位置按颜色区分？

谢谢！

Answer 1

我通过声明位置数组和数组图像以简单的方式完成了这项工作。我有 viewDidLoad 方法如下。

 override func viewDidLoad() {
    super.viewDidLoad()
    self.mapView.delegate = self

    let location = [
        CLLocationCoordinate2D(latitude: 12, longitude: 77),
        CLLocationCoordinate2D(latitude: 12.5, longitude: 77.5),
        CLLocationCoordinate2D(latitude: 13, longitude: 78),
        CLLocationCoordinate2D(latitude: 13.5, longitude: 78)
    ]

    let pins = [
        "red.png",
        "blue.png",
        "green.png",
        "yellow.png"
    ]

    var annotations = [MKPointAnnotation]()
    for (index, eachLocation) in location.enumerate() {
        let pinImageName = pins[index]
        let annotation = MKPointAnnotation()
        annotation.coordinate = eachLocation
        annotation.title = "\(pinImageName)"
        annotations.append(annotation)
    }
    mapView.addAnnotations(annotations)
}

在 viewForAnnotation 委托方法中，只需从标题属性获取该图像名称并明确禁用标注

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    let annotationReuseId = "Truck"
    var trkPin = mapView.dequeueReusableAnnotationViewWithIdentifier(annotationReuseId)
    if trkPin == nil {
        trkPin = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationReuseId)
        trkPin!.canShowCallout = false
    } else {
        trkPin!.annotation = annotation
        if let image = annotation.title {
            trkPin!.image = UIImage(named: image ?? "default.png")
        } else {
            trkPin!.image = UIImage(named: "default.png")
        }
    }
    return trkPin
}

将不同的图像与iOS的不同位置相关联

1 个答案: