目标是针对存储在结构数组中的某些值自定义图钉颜色。

通过这里的一些帮助，我实现了以下viewForAnnotation委托方法，该方法很好地基于结构数据数组的大小在循环中迭代调用此委托方法。因此，如果我要将所有引脚设置为一种颜色（例如，紫色）（这是下面代码中的注释行），则可以使用。

问题是当我放入一个开关以根据数组中的值设置颜色时，它会通过此代码，但不遵守任何大小写值来将其设置为备用颜色，并且所有内容都变为红色针（看似默认值）。我已经打印出状态并进行调试，以知道它正在进入交换机内部并相应地设置pinColor，但是它们似乎不粘。

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

       let theindex = mystructindex  // grab the index from a global to be used below

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

        let reuseId = "pin"
        var pinView = aMapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView

        if pinView == nil {
            //println("Pinview was nil")
            pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            pinView!.canShowCallout = true
            pinView!.animatesDrop = true

            // Preventive if to keep this from being called beyond my arrays index value as the delegate getting called beyond the for loop for some unknown reason

            if (theindex < MySupplierData.count) {

                // Set the pin color based on the status value in MySupplierData structure array
                switch MySupplierData[mystructindex].status  {

                case 0,1:
                    println("Case 0 or 1 - setting to Red")
                    pinView!.pinColor = .Red  // Needs help, show red pin
                case 2:
                    println("Case 2 - Setting to Green")
                    pinView!.pinColor = .Green  // Looking Good 
                case 3:
                    println("Case 3 - Setting to Purple")
                    pinView!.pinColor = .Purple  // Could use a follow-up
                default:
                    println("Case default - Should Never Happen")
                    break;

                }   // end switch
            } // end if

            // pinView!.pinColor = .Purple  // This works fine without the switch and respects any color I set it to.
        }
        else {
            pinView!.annotation = annotation
        }

        return pinView
}

在ViewController的for循环中，我将其称为如下，但对返回值不做任何事情。

        // previous to this I setup some Titles and Subtitle which work fine
        self.theMapView.addAnnotation(myAnnotation)
        // Call to my mapview   
        mapView(theMapView, viewForAnnotation: myAnnotation)

我对返回的Pinview不执行任何操作-认为我不需要这样做，但是在使用切换代码时，所有的引脚在此时都被绘制为红色。从根本上说，我在这里一定错过了一些东西。

7-8-14更新以解决Anna的大力帮助/辅导中的修订代码问题。TKS！

几乎可以使用，地图中的所有图钉都有正确的颜色，但即时显示之外的图钉有时是错误的。在此处发布所有涉及的代码，因为它可能对其他人有所帮助，因为这似乎是关于如何在Google
Maps中进行自定义工作的非常普遍的问题。

建议使用一个自定义类将其他变量保存在自定义批注中-在这种情况下，状态值来自我的数据结构MySupplierData。

class CustomMapPinAnnotation : NSObject, MKAnnotation {
  var coordinate: CLLocationCoordinate2D
  var title: String
  var subtitle: String
  var status: Int

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

  }
}

修改后的mapView-现在利用传递给它的新CustomMapPinAnnotation：

func mapView(aMapView: MKMapView!,
    viewForAnnotation annotation: CustomMapPinAnnotation!) -> MKAnnotationView! {

        let reuseId = "pin"          
        var pinView = aMapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView

        if pinView == nil {
            //println("Pinview was nil")
            pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
            pinView!.canShowCallout = true
            pinView!.animatesDrop = true

            // Code to catch my custom CustomMapPinAnnotation so we can check the status and set the color               
            if annotation.isKindOfClass(CustomMapPinAnnotation)
            {
                println("FOUND OUR CustomMapPinAnnotation CLASS IN mapView")
                println(" Custom Title = \(annotation.title)")
                println(" Custom status passed = \(annotation.status)")
                switch annotation.status {

                case 0,1:
                    println("Case 0 or 1 - Setting to Red")
                    pinView!.pinColor = .Red
                case 2:
                    println("Case 2 - Setting to Green")
                    pinView!.pinColor = .Green
                case 3:
                    println("Case 3 - Setting to Purple")
                    pinView!.pinColor = .Purple 
                default:
                    println("Case default - Should Never Happen")
                    break;
                }  // switch   
            }  // if     
        }
        else {
            pinView!.annotation = annotation
        }
        return pinView
} //func mapView

在viewDidLoad中，使用设置和For循环设置注释

override func viewDidLoad() {
    super.viewDidLoad()

    // setup the region and Span 
    var theSpan:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)

    // Set the region to the the first element of the structure array.
    var theRegion:MKCoordinateRegion = MKCoordinateRegionMake(CLLocationCoordinate2DMake(MySupplierData[0].latitude, MySupplierData[0].longitude), theSpan)

    // This set the Map Type (Standard, Satellite, Hybrid)
    self.theMapView.mapType = MKMapType.Standard

    // Now loop through the structure data from 1 top the end of the structure to map the data

    var mytitle: String = ""
    var mysubtitle: String = ""
    var myCustomPinAnnotation: CustomMapPinAnnotation

    for mystructindex = 0; mystructindex < MySupplierData.count; ++mystructindex {           
        println("INSIDE SUPPLIER LOOP INDEX = \(mystructindex)" )

        switch MySupplierData[mystructindex].status {
        case 0:
            mytitle =  "(Red) " + MySupplierData[mystructindex].company
        case 1:
            mytitle = "(Red) " + MySupplierData[mystructindex].company
        case 2:
            mytitle = "(Geeen) " + MySupplierData[mystructindex].company
        case 3:
            mytitle = "(Purple) " + MySupplierData[mystructindex].company
        default:
            mytitle = "? " + MySupplierData[mystructindex].company

        }    
        mysubtitle = MySupplierData[mystructindex].subtitle

         // Create the Custom Annotations with my added status code   
        myCustomPinAnnotation = CustomMapPinAnnotation(
            coordinate: CLLocationCoordinate2DMake(MySupplierData[mystructindex].latitude,MySupplierData[mystructindex].longitude),
            title: mytitle,        // custom title
            subtitle: mysubtitle,  // custom subtitle
            status: MySupplierData[mystructindex].status)  // status that will drive pin color

        // put this annotation in the view.
        self.theMapView.addAnnotation(myCustomPinAnnotation)
    }  // For

    // This line brings up the display with the specific region in mind, otherwise it seems to default to a US Map.
    self.theMapView.setRegion(theRegion, animated: true)

}  // viewDidLoad

调试输出显示，在mapView中的自定义viewForAnnotation在内部自行执行之前，For循环按预期完成了创建myCustomPinAnnotation的执行。当我将地图移到即时视图之外的区域时，我确实注意到mapView中的viewForAnnotation根据需要被调用，并且我看到我的开关相应地执行了，但是针脚颜色并不总是正确的。初始显示映射中的所有图钉每次都是正确的，因此我一直坚持使用这些外部区域的图钉，以了解它们为何断开。