Mapview nil 关闭,在 StackO 上看到了主题。但没有帮助我

Mapview nil closure, saw topics on StackO. but didn't help me

我已经阅读了用户让我检查的这个主题

但这对我没有帮助,mapView 仍然为零。 我也读过这个,但没有帮助 http://www.apeth.com/swiftBook/ch04.html#SECinstanceRefs 谁能请 review/see 我的代码并帮助我,而不是链接到另一个根本没有帮助的主题?

我在 class 驱动程序中有这个功能

private static let _instance = Driver();

static var Instance: Driver {
    return _instance;
}

func getAllDriversLocations(){

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController;

    var location : [CLLocation] = []

    Account.Instance.dbRef.child("driverLocations").observeSingleEvent(of: .value, with: { (snapshot) in
        if let data = snapshot.value as? NSDictionary {
            if let loca = data as? [String: [String:Any]]{
                let keys = loca.keys
                let sortedKeys = Array(keys).sorted(by: { [=10=] >  }) // highest will be the first
                _ = sortedKeys[0]
                //let intHighPlus = Int(highestKey)! + 1
                for index in 0...sortedKeys.count-1{

                    let stringIndex = "0\(index+1)"
                    if let indexChecked = loca[stringIndex]{
                        if let doubleLatString = (indexChecked["latitude"]){
                            let latDouble = (doubleLatString as! NSString).doubleValue

                        if let doubleLongString = (indexChecked["longitude"]){
                            let longDouble = (doubleLongString as! NSString).doubleValue
                            location.append(CLLocation(latitude: (latDouble), longitude: (longDouble)))
                            }
                        }
                    }
                }
                if location.count > 0{
                    vc.placeAllCabPlacemarks(array: location)
                }
            }
        }
    })
}

所以在这里我调用了 placeAllCabPlacemarks,位置数组在 placeAllCabPlacemarks 函数中正确获取,但后来我发现 mapView 在这里为 nil 的问题:

@IBOutlet weak var myMap: MKMapView?

override func viewDidLoad() {
    super.viewDidLoad()

    myMap?.delegate = self
    initializeLocationManager()
    Driver.Instance.getAllDriversLocations()
}
func placeAllCabPlacemarks(array: [CLLocation]){
    //print("locs: \(array)")
    let arraySize = array
    for index in 0...arraySize-1 {
        let annotation = MKPointAnnotation()
        annotation.coordinate = CLLocationCoordinate2D(latitude: array[index].coordinate.latitude, longitude: array[index].coordinate.longitude)
            print("map \(myMap)") //Here it's nil
            myMap?.addAnnotation(annotation as MKAnnotation)
        }
}

我确实检查了所有内容,还检查了 Internet 和 Whosebug 上的一些项目。 有人可以检查为什么这不起作用吗? 主要问题是mapView是nil...

所以我在之前 post 中链接到的答案的问题...

第一个问题是我在以下位置使用单例:

Driver.Instance.getAllDriversLocations()

我将其更改为:

let driver = Driver() //instance of the class driver
driver.getAllDriversLocations(callBack: self)

第二个问题是这段代码:

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController;

我将该代码更改为:

func getAllDriversLocations(callBack : ViewController){

    let vc = callBack
}

我希望有一天我能帮助某人解决这个问题,而不是像以前的 post 我链接到的那样让事情变得更糟..