swift - 在 Swift 中跳转到 map 应用程序

Question

您好，我正在尝试制作一个按钮，按下该按钮时，会从 NSUserDefaults 获取位置并转到 map 应用程序，从而允许用户从其位置获取方向。由于某种原因，我的代码中出现错误，内容为

"CLLocationCoordinate2D does not have a member named 'mapItem'"

这是我的代码

@IBAction func DirectionsButton(sender: AnyObject) {

    let spotTitle = NSUserDefaults.standardUserDefaults().objectForKey("SpotTitle") as! String
    let spotLoc = NSUserDefaults.standardUserDefaults().objectForKey("SpotLoc") as! [String : NSNumber]
    //Get user location from that Dictionary
    let spotLat = spotLoc["lat"] as! CLLocationDegrees //Convert NSNumber to CLLocationDegrees
    let spotLng = spotLoc["lng"] as! CLLocationDegrees  //Convert NSNumber to CLLocationDegrees


    let SpotLoca = CLLocationCoordinate2DMake(spotLat, spotLng);
    func mapItem() -> MKMapItem {
        let addressDictionary = [String(kABPersonAddressStreetKey): spotTitle]
        let placemark = MKPlacemark(coordinate: SpotLoca, addressDictionary: addressDictionary)

        let mapItem = MKMapItem(placemark: placemark)
        mapItem.name = title

        return mapItem
    }
    let location = SpotLoca
    let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
    location.mapItem().openInMapsWithLaunchOptions(launchOptions)
}

有谁可以帮助我吗？谢谢!!!

Answer 1

let SpotLoca = CLLocationCoordinate2DMake(spotLat, spotLng);
...
let location = SpotLoca
...
location.mapItem().openInMapsWithLaunchOptions(launchOptions)

您正在取消引用 CLLocationCooperative2D，它确实没有成员 mapItem。我认为你的最后一行应该是:

mapItem().openInMapsWithLaunchOptions(launchOptions)

或者，您可以删除该函数并像这样执行:

let spotTitle = NSUserDefaults.standardUserDefaults().objectForKey("SpotTitle") as! String
let spotLoc = NSUserDefaults.standardUserDefaults().objectForKey("SpotLoc") as! [String : NSNumber]
//Get user location from that Dictionary
let spotLat = spotLoc["lat"] as! CLLocationDegrees //Convert NSNumber to CLLocationDegrees
let spotLng = spotLoc["lng"] as! CLLocationDegrees  //Convert NSNumber to CLLocationDegrees


let SpotLoca = CLLocationCoordinate2DMake(spotLat, spotLng);
let addressDictionary = [String(kABPersonAddressStreetKey): spotTitle]
let placemark = MKPlacemark(coordinate: SpotLoca, addressDictionary: addressDictionary)

let mapItem = MKMapItem(placemark: placemark)
mapItem.name = title

let launchOptions = [MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving]
mapItem.openInMapsWithLaunchOptions(launchOptions)