CLGeocoder始终为纬度/经度返回{nil

如何解决CLGeocoder始终为纬度/经度返回{nil

我正在尝试获取经纬度坐标以与基于位置的提醒配合使用（Eventkit） 该地址有效且已正确发送到函数，如果我为坐标提供了一个可选值，则由函数ok返回，因此该函数似乎可以正常工作，但地理编码器未按预期转换地址。 我不明白为什么不会。

var lat: Double?
var lon: Double?

func getLocation(address: String)  -> CLLocation {
    let geocoder = CLGeocoder()
    geocoder.geocodeAddressstring(address) { placemarks,error in
        guard let placemark = placemarks?.first else { return }
        
        let coordinate = placemark.location?.coordinate
        lat = coordinate?.latitude //Is always nil
        lon = coordinate?.longitude //Is always nil
        
    }
    // Note: providing ?? sample coordinates in the return below works

    return CLLocation(latitude: lat!,longitude: lon!)
}

if self.locationChoice == "Dog's Home" {
    
    let address = "\(self.dog.addressLine1),\(self.dog.town),\(self.dog.postcode)"
    let structuredLocation = EKStructuredLocation(title: address)
    
    structuredLocation.geoLocation = getLocation(address: address)// asking for CLLocation
    structuredLocation.radius = 500
    let alarm = EKAlarm()
    if self.whenArrivingOrLeaving == 0 {
        alarm.proximity = EKAlarmProximity.enter
    }else {
        alarm.proximity = EKAlarmProximity.leave
    }
    alarm.structuredLocation = structuredLocation
    newReminder.addAlarm(alarm)
}

解决方法

从异步方法返回值而不是零应该使用补全

func getLocation(address: String,completion:@escaping(CLLocation? -> ())) {
     let geocoder = CLGeocoder()
     geocoder.geocodeAddressString(address) { placemarks,error in
           guard let placemark = placemarks?.first else { return } 
           completion(placemark.location)
     }

}

致电

getLocation(address: address) { loc in 
   // embed all code here 
}