我想从函数中获取值.有功能块.当块执行时,函数已经返回值.我尝试了很多不同的方法,但他们没有帮助我.我使用了NSOperation和Dispatch.该函数始终返回值,直到执行块为止.
var superPlace: MKPlacemark!
func returnPlaceMarkInfo(coordinate: CLLocationCoordinate2D) -> MKPlacemark? {
let location = CLLocation(latitude: coordinate.latitude,longitude: coordinate.longitude)
geocoder.reverseGeocodeLocation(location) { (arrayPlaceMark,error) -> Void in
if error == nil {
let firstPlace = arrayPlaceMark!.first!
let addressDictionaryPass = firstPlace.addressDictionary as! [String : AnyObject]
self.superPlace = MKPlacemark(coordinate: location.coordinate,addressDictionary: addressDictionaryPass)
}
}
return superPlace
}
解决方法
您不能简单地返回此处,因为reverseGeocodeLocation函数是异步运行的,因此您需要使用自己的完成块：
var superPlace: MKPlacemark!
func getPlaceMarkInfo(coordinate: CLLocationCoordinate2D,completion: (superPlace: MKPlacemark?) -> ()) {
let location = CLLocation(latitude: coordinate.latitude,error) -> Void in
if error == nil {
let firstPlace = arrayPlaceMark!.first!
let addressDictionaryPass = firstPlace.addressDictionary as! [String : AnyObject]
self.superPlace = MKPlacemark(coordinate: location.coordinate,addressDictionary: addressDictionaryPass)
completion(superPlace: superPlace)
} else {
completion(superPlace: nil)
}
}
}
