CLLocation位於CLLocationCoordinate2D在swift中

Question

您在理解swift編程中的聲明部分時有許多麻煩。 我的代碼行CLLocationCoordinate2D myCoordinate = myLocation.coordinate; 作爲同我在斯威夫特編程聲明，但我得到的錯誤

var location1:CLLocation! = locationManager1.location 
var coordinate1:CLLocationCoordinate2D = location1.coordinate 

致命錯誤：無法解開Optional.None

Answer 1

的location1可以nil，和在訪問它的proprities之前，你必須檢查它是否是nil，比如eg這個：

let locationManager1: CLLocationManager // your location manager 

// ... 

if let location1: CLLocation! = locationManager1.location { 
    var coordinate1: CLLocationCoordinate2D = location1.coordinate 

    // ... proceed with the location and coordintes 

} else { 
    println("no location...") 
}