从 MKMapView 上的 CLLocationCoordinate2D 数组添加点不起作用

问：

我正在使用以下代码在按钮单击时将存储的引脚点添加到myMKMap;

func addPoint(){
    var count: Int = 0
    repeat {
        let pin = MKPointAnnotation()
        pin.coordinate = CLLocationCoordinate2D(mypointList[count])
        pin.title = placenames[count]
        pin.subtitle = placedetails[count]
        mymap.addAnnotation(pin)
        count += 1
    }
    while count < 3

mypointList[] 如下所示;

var mypointList = [CLLocationCoordinate2D(latitude: 37.19722, longitude: 25.82189),
           CLLocationCoordinate2D(latitude: 37.20103, longitude: 25.83009),
           CLLocationCoordinate2D(latitude: 37.20092, longitude: 25.81781),
           CLLocationCoordinate2D(latitude: 37.19989, longitude: 2259.82449)]
var placenames: [String] = ["sample place 1", "sample place 2", "sample place 3", "sample place 4"]
var placedetails: [String] = ["sample place detail 1", "sample place detail 2", "sample place detail 3", "sample place detail 4"]

但是当我运行应用程序时没有添加引脚。

顺便说一句，当替换为重复循环中的“pin.coordinate = CLLocationCoordinate2D（mypointList[count]）”行时，以下代码有效;

pin.coordinate = CLLocationCoordinate2D(latitude: 37.1972, longitude: 25.2744)

数组有问题吗？

谢谢