不能调用 locationManager(_::didUpdateLocations:)答案

【问题标题】：Can not called locationManager(_::didUpdateLocations:)不能调用 locationManager(_::didUpdateLocations:)
【发布时间】：2020-09-08 17:54:08
【问题描述】：

我尝试在用户启动应用时获取坐标。

我在独立文件中设置了 locationManager 代码：

UserLocation.swift：

import Foundation
import CoreLocation

class UserLocation: NSObject, CLLocationManagerDelegate {
    var userCurrentLocation: CLLocationCoordinate2D? 
    let locationManager = CLLocationManager()
    
    func locationSetup() {
        locationManager.requestWhenInUseAuthorization()
        if CLLocationManager.authorizationStatus() != CLAuthorizationStatus.authorizedWhenInUse {
            print("authorization error")
            return
        }
        locationManager.distanceFilter = 300
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.delegate = self
        locationManager.startUpdatingLocation()
        print("startUpdatingLocation")
        if CLLocationManager.locationServicesEnabled() {
            print("locationServicesEnabled")
        }
    }
    
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        print("locationManager getting start")
        if let location = locations.last {
            self.userCurrentLocation = CLLocationCoordinate2D(latitude: location.coordinate.latitude, longitude: location.coordinate.longitude)
            print("print location in locationManager: \(String(describing: userCurrentLocation?.latitude))")
            locationManager.stopUpdatingLocation()
            
        }
    }
    func locationManager(_ manager: CLLocationManager, didFinishDeferredUpdatesWithError error: Error?) {
        print(error?.localizedDescription as Any)
        return
    }
    
}

然后，我像这样调用 AppDelegate.swift 的application(_::didFinishLaunchingWithOptions:) 中的函数：

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        let getUserLocation = UserLocation()
        getUserLocation.locationSetup()
}

但是，只有成功调用locationSetup()函数，从未调用过相关函数locationManager(_::didUpdateLocations:)。 print("locationManager getting start") 我把第一行放在locationManager(_::didUpdateLocations:) 里，从来没有打印出来

顺便说一句，在 info.plist 中，我已经设置了 Privacy - Location When In Use Usage Description 。

谁能帮帮我？

【问题讨论】：

标签： ios swift cllocationmanager

【解决方案1】：

您的getUserLocation 是一个局部变量。它在您创建后 1 毫秒就消失了。所以它永远没有时间做任何事情（例如位置更新）。将其提升为实例变量，使其寿命更长：

var getUserLocation : UserLocation?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    self.getUserLocation = UserLocation()
    self.getUserLocation?.locationSetup()
    return true
}

（也请使用更好的变量名。对象引用不应以动词开头。）

【讨论】：

【解决方案2】：

请交叉检查模拟器位置：模拟器 -> 调试 -> 位置在你的情况下不应该是 None...

希望这会对您有所帮助...谢谢:)

【讨论】：