swift - 为什么确认窗口在 viewDidLoad 中消失了？

Question

尝试获取用户的位置。确认窗口出现 1 秒后立即消失

import UIKit
import MapKit
import CoreLocation

class NearbyViewController: UIViewController, CLLocationManagerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
      let locationManager = CLLocationManager()
      locationManager.requestWhenInUseAuthorization()
}

}

Answer 1

制作

let locationManager = CLLocationManager()

实例变量

class ViewController: UIViewController, CLLocationManagerDelegate {
   let locationManager = CLLocationManager()
    override func viewDidLoad() {
        super.viewDidLoad()
        locationManager.requestWhenInUseAuthorization()
    } 
} 

因为它在 viewDidLoad 的末尾被释放，它会自动隐藏警报