Swift - 首先运行 reverseGeocodeLocation

Question

我有以下代码：

func addAnnotation(gesture: UIGestureRecognizer){

    //touch point
    var touchPoint = gesture.locationInView(self.UImapMK)
    var location = UImapMK.convertPoint(touchPoint, toCoordinateFromView: self.UImapMK)

    var cllocation = CLLocation(latitude: location.latitude, longitude: location.longitude)
    var addressStr: String = "Undefined"

    //GeoCoder
    CLGeocoder().reverseGeocodeLocation(cllocation, completionHandler: { (placemark, error) -> Void in
        if error == nil {
            if placemark.count > 0{
                var address = placemark[0] as! CLPlacemark
                addressStr = "\(address.locality), \(address.administrativeArea)"
            }
        }
        else{
            addressStr = "Error"
        }

        println("RUN: CLgeocoder")
    })

    //Annotation
    var annotation = MKPointAnnotation()
    annotation.coordinate = location
    annotation.title = addressStr

    UImapMK.addAnnotation(annotation)
}

但是 reverseGeocodeLocation 函数似乎在 addAnnotation 之后运行，所以每次我将 addressStr 设置为“未定义”。

有没有办法让 reverseGeocodeLocation 先运行？谢谢！

Answer 1

这种事情一遍又一遍地出现。将所有添加注释的代码移到完成块内。