ios - 我试图放下别针，但出现此错误 : Cannot assign value of type 'CLLocationManager' to type 'CLLocationCoordinate2D'

Question

@IBAction func drop(sender: AnyObject)
{
     let mapAnnotation        = MKPointAnnotation()
     mapAnnotation.coordinate = locationManager   //  Cannot assign value of type 'CLLocationManager' to type 'CLLocationCoordinate2D'
     mapAnnotation.title      = "If you want a title"
     mapAnnotation.subtitle   = "or subtitle"
     myMap.addAnnotation(mapAnnotation)
}

Answer 1

如错误所述，您不能将 CLLocationManager 对象分配给 CLLocationCoordinate2D 类型的属性。

您需要将代码更改为:

mapAnnotation.coordinate = locationManager.location!.coordinate

由于各种原因，location 属性可能为nil，强制解包会导致崩溃。所以最好使用安全解包:

if let loc = locationManager.location
{
   mapAnnotation.coordinate = loc.coordinate
}

引用资料:

1. MKPointAnnotation - coordinate
2. CLLocationManager - location