CLGeocoder 对于纬度/经度总是 returns nil

Question

我正在尝试获取 latitude/longitude 坐标以用于基于位置的提醒 (Eventkit) 地址是有效的并且被正确地发送到函数，如果我为函数返回的坐标提供一个可选的，那么函数似乎可以工作，但地理编码器没有按预期转换地址。我不明白为什么它不会。

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)
}

Answer 1

你不是零return你应该使用完成的异步方法的值

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)
     }

}

通话

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

CLGeocoder 对于纬度/经度总是 returns nil

CLGeocoder always returns nil for latitude / longitude

ios

swift

cllocation

eventkit