我想取出委托中获取的坐标

Question

我编写了一个程序，只要当前位置发生变化，它就会使用 LocationManagerDelegate 在调试区域显示坐标。检索坐标时出错

不能在属性初始值设定项中使用实例成员 'locationManager'；属性初始值设定项运行在 'self' 可用之前

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate{

var locationManager: CLLocationManager!

override func viewDidLoad() {
    super.viewDidLoad()
     // Do any additional setup after loading the view, typically from a nib.

   setUpLocationManager()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func setUpLocationManager() {
    locationManager = CLLocationManager()
    guard let locationManager = locationManager else {return}
    locationManager.requestWhenInUseAuthorization()
    let status = CLLocationManager.authorizationStatus()
    if status == .authorizedWhenInUse {
        locationManager.delegate = self
        locationManager.distanceFilter = 10
        locationManager.startUpdatingLocation()
        printLocation()
    }
}


func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) ->Optional<Any> {
    let location = locations.first
    let latitude = location?.coordinate.latitude
    let longitude = location?.coordinate.longitude
    let latlong = [latitude, longitude]
    return latlong
}
let myLocation = locationManager()

func printLocation() {
    print("test\(myLocation)")
}

}

测试（函数）是输出

let myLocation = locationManager ()

当你改成

let myLocation = locationManager

Answer 1

您的代码包含一些错误。

发生错误是因为您无法在 class 的顶层执行受影响的行。

首先，您不得更改委托方法的签名。这个自定义委托方法

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) ->Optional<Any> { ...

将永远不会被调用。

除此之外，为什么您将 return 类型声明为 Any?，尽管它应该是 [CLLocationCoordinate2D]？

立即创建位置管理器，替换

var locationManager: CLLocationManager!

和

let locationManager = CLLocationManager()

在setUpLocationManager()中删除行

~~locationManager = CLLocationManager() guard let locationManager = locationManager else {return} // this line is completely pointless anyway printLocation()~~

委托方法didUpdateLocations被周期性地异步地调用。在方法中打印结果

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    guard let location = locations.first else { return }
    let latitude = location.coordinate.latitude
    let longitude = location.coordinate.longitude
    let latlong = [latitude, longitude]
    print("test", latlong)
}

删除

~~let myLocation = locationManager() func printLocation() { print("test\(myLocation)") }~~

我想取出委托中获取的坐标

I want to take out the coordinates acquired in the delegate

core-location

swift