Swift-设置从数组到注释引脚的不同图像 [英] Swift - setting different images from array to annotation pins

问题描述

我想知道如何将不同的图像设置为mapview上的注释图钉.以下问题之间的区别

I wonder how to set different images to annotation pins on mapview. The difference between the following questions

viewForAnnotation混淆并迭代自定义pinColor

为注释添加不同的图像

是我的图像数组是根据服务器响应动态生成的.阵列没有固定大小，因此开关/外壳构造不是一个好主意.而且，我不确定如何将解决方案与上面主题中提到的自定义类一起应用.我知道最好对以前提出的问题之一发表评论，但不幸的是，我现在还是个菜鸟，所以做不到(太少了点).

is that my array of images is generated dynamically with regard to server response. There is no fixed size of the array, so switch/case construction is not a good idea. Moreover, I'm not sure how to apply the solution with custom class aforementioned in topic above. I'm aware that it would be better to post a comment to one of the questions asked before, but unfortunately I'm too rookie at the moment to do that(too few points).

这是在显示map的函数内部执行的for循环:

This is the for loop performed inside functions that shows map:

for var r=0;r<arrayOfRestaurants.count;r++
    {

        var summonRestaurant:NSDictionary = arrayOfRestaurants[r] as NSDictionary
        var nearbyRestaurant = Restaurant(nearbyRestaurants:summonRestaurant)
        var latRestaurant=(nearbyRestaurant.latitude as NSString).doubleValue
        var longRestaurant=(nearbyRestaurant.longitude as NSString).doubleValue
        var locationOfRestaurant = CLLocationCoordinate2D(
            latitude: latRestaurant as CLLocationDegrees, longitude: longRestaurant as CLLocationDegrees)
        var lunchArray: NSArray = nearbyRestaurant.lunch as NSArray
        var annotation = MKPointAnnotation()

        annotation.setCoordinate(locationOfRestaurant)
        annotation.title = nearbyRestaurant.name + "  " + nearbyRestaurant.distance + " km"
        map.addAnnotation(annotation)
}

这是viewForAnnotation委托方法(与上述线程中使用的方法完全相同):

And here is viewForAnnotation delegate method(quite identical to the method used in aforementioned threads):

func mapView(map: MKMapView!,
    viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {

        if annotation is MKUserLocation {
            //return nil so map view draws "blue dot" for standard user location
            return nil
        }

        let reuseId = "pin"

        var pinView = map.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
        if pinView == nil {
            pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            pinView!.canShowCallout = true
            pinView!.animatesDrop = true
            pinView!.pinColor = .Purple

            pinView!.image = globalImageArray[0]

            }
        else {
            pinView!.annotation = annotation
        }

        return pinView
}

如您所见，我为pinView分配了一个特定的图像，即globalImageArray [0]，但我正在寻找一种解决方案，该方法可以让我遍历globalImageArray并为每个引脚分配一个特定的图像.

As you can see, I assigned a certain image to pinView which is globalImageArray[0], but I look for a solution that let me iterate over the globalImageArray and assign a certain image to each pin.

很高兴得到任何帮助，在此先谢谢您！

I'd be glad to receive any help, thanks in advance!

推荐答案

首先，您需要创建自己的采用MKAnnotation协议进行注释的类-

First, you need to create your own class that adopts the MKAnnotation protocol for your annotations -

class RestaurantAnnotation : NSObject, MKAnnotation {
    var coordinate: CLLocationCoordinate2D
    var title: String
    var subtitle: String
    var image: UIImage?

    init(coordinate: CLLocationCoordinate2D, title: String, subtitle: String) {
        self.coordinate = coordinate
        self.title = title
        self.subtitle = subtitle
    }
}

然后，在添加注释并设置图像时使用此类的实例-

Then, use instances of this class when you add the annotation and set the image -

for var r=0;r<arrayOfRestaurants.count;r++
    {

        var summonRestaurant:NSDictionary = arrayOfRestaurants[r] as NSDictionary
        var nearbyRestaurant = Restaurant(nearbyRestaurants:summonRestaurant)
        var latRestaurant=(nearbyRestaurant.latitude as NSString).doubleValue
        var longRestaurant=(nearbyRestaurant.longitude as NSString).doubleValue
        let locationOfRestaurant = CLLocationCoordinate2D(
            latitude: latRestaurant as CLLocationDegrees, longitude: longRestaurant as CLLocationDegrees)
        var lunchArray: NSArray = nearbyRestaurant.lunch as NSArray

        let title = nearbyRestaurant.name + "  " + nearbyRestaurant.distance +" km"
        var annotation = RestaurantAnnotation(coordinate, title:title, subtitle:"")
        annotation.image = globalImageArray[r]
        map.addAnnotation(annotation)
}

现在，在用于注释的视图中，您可以访问图像-

Now, in your view for annotation you can access the image -

func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
    if !(annotation is RestaurantAnnotation) {
        return nil
    }

    let reuseId = "restaurant"
    var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
    if anView == nil {
        anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        anView.canShowCallout = true
    }
    else {
        anView.annotation = annotation
    }

    let restaurantAnnotation = annotation as RestaurantAnnotation

    if (restaurantAnnotation.image != nil) {
            anView.image = restaurantAnnotation.image!
            anView.image.layer.setCornerRadius(8.0)
            anView.image.layer.clipsToBounds=true
        }
        else {
         // Perhaps set some default image
        }

    return anView
}

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