在 ViewController 上获取初始化程序错误

Question

我收到错误："Class 'ViewController' has no initializer"。我已将问题缩小到正在调用的这个函数。有人看到问题了吗？

let locationManager1: CLLocationManager // your location manager
    func addBoundry(loc: CLLocation)
    {
        if let loc: CLLocation! = locationManager1.location {
        let center: CLLocationCoordinate2D = loc!.coordinate
        let lat: CLLocationDegrees = center.latitude
        let long: CLLocationDegrees = center.longitude
        var points = [CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long),CLLocationCoordinate2DMake(lat,long)]
        let polygon = MKPolygon(coordinates: &points, count: points.count)

        mapView.addOverlay(polygon)

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

Answer 1

当您说 let locationManager1: CLLocationManager 时，您是在声明属性不能是 nil，但实际上并没有将任何内容分配给它。

因此，您要么需要声明一个 init 以确保 locationManager1 恰好分配了一个值（毕竟它是一个 let 常量，而不是 var !) 或像这样初始化属性内联：

let locationManager1 = CLLocationManager()

Answer 2

分配属性时使用可选。

 let locationManager1: CLLocationManager?

在 ViewController 上获取初始化程序错误

Getting initializer error on ViewController

xcode

initializer

viewcontroller

ios

swift