ios - 快速从CLLocation到CLLocationCoordinate2D

Hi在理解快速编程中的声明部分时遇到了很多麻烦。
我有一行代码CLLocationCoordinate2D myCoordinate = myLocation.coordinate;就像我在Swift编程中声明的一样，但是我遇到了错误

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

致命错误:无法解开Optional.None

最佳答案

location1可以是nil，您必须先检查它是否是nil，然后才能访问其属性，例如这:

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...")
}

关于ios - 快速从CLLocation到CLLocationCoordinate2D，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/24363911/