Swift 中单独类中的位置管理器答案

【问题标题】：Location Manager in seperate class in SwiftSwift 中单独类中的位置管理器
【发布时间】：2020-06-23 07:34:07
【问题描述】：

所以我目前正在做一些项目，我遇到了这个问题。如果我在 ViewController 中使用 CLLocationDelegate，它会正常运行，但是当我尝试将它分离到它自己的类中时，它就不起作用了。当我尝试运行它时，它不会运行下面的功能。任何建议表示赞赏:)

视图控制器：

import UIKit
import CoreLocation
import Alamofire
import SwiftyJSON

class TodayViewController: UIViewController {

var locationManager = CLLocationManager()
override func viewDidLoad() {
    super.viewDidLoad()
 locationRequest.init()
    }    
 }

LocationManager 类：

    import Foundation
    import CoreLocation

 class locationRequest: NSObject, CLLocationManagerDelegate {
var locationManager = CLLocationManager()

override init() {
    
    print("before super.init()")
    
    super.init()
    
    print("after super.init()")
    
    if CLLocationManager.locationServicesEnabled() {
        print("before setting delegate")
        locationManager.delegate = self
        
        locationManager.requestWhenInUseAuthorization()
        print("after setting delegate")
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers
        locationManager.startUpdatingLocation()
    }
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    print("didUpdate")
    if let location: CLLocationCoordinate2D = manager.location?.coordinate {
        print(location.latitude)
        print(location.longitude)
          }
       }

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    print("didFail")
    print(error.localizedDescription)
      }
   }

【问题讨论】：

标签： swift class cllocationmanager code-separation

【解决方案1】：

首先请用大写字母命名自定义结构和类。

因为没有对locationRequest 类的强引用而发生错误。

要么将类设计为单例类

class LocationRequest: NSObject, CLLocationManagerDelegate {

    static let shared = LocationRequest()

    ...   

}

...

class TodayViewController: UIViewController {

    var locationRequest = LocationRequest.shared

    override func viewDidLoad() {
        super.viewDidLoad()
    }

或创建一个惰性实例化属性

class LocationRequest: NSObject, CLLocationManagerDelegate { ... }

...

class TodayViewController: UIViewController {

    lazy var locationRequest = LocationRequest()

    override func viewDidLoad() {
        super.viewDidLoad()
    }    
}

【讨论】：