[英]Location Manager in seperate class in Swift
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 class 中时,它就不起作用了。 当我尝试运行它时,它只是不运行 function 波纹管。 任何建议表示赞赏:)
查看 controller:
import UIKit
import CoreLocation
import Alamofire
import SwiftyJSON
class TodayViewController: UIViewController {
var locationManager = CLLocationManager()
override func viewDidLoad() {
super.viewDidLoad()
locationRequest.init()
}
}
位置管理器 class:
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)
}
}
首先,请用大写字母命名自定义结构和类。
发生错误是因为没有对locationRequest
class 的强引用。
将 class 设计为 singleton
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()
}
}
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