swift - 为什么是locationManager(:didUpdateLocations) not called

Question

我编写了以下测试代码

 @IBAction func btnLocation(_ sender: NSButton) {
    let locManager = CLLocationManager()
    if CLLocationManager.authorizationStatus() != .authorized {
        print("not authorized")
    }
    locManager.delegate = self
    locManager.desiredAccuracy = kCLLocationAccuracyBest
    locManager.startUpdatingLocation()
    locManager.requestLocation()
}

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let location = locations[0]
    print(location.coordinate.latitude)
    manager.stopUpdatingLocation()
    let geoCoder = CLGeocoder()
    geoCoder.reverseGeocodeLocation(location, completionHandler: {(places, error) in
        let place: CLPlacemark = places![0]
        print(place.administrativeArea!)
    })
}

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
    print(error)
}

func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
    print("authorization changed")
}

但是 locationManager(:didUpdateLocations) 没有被调用，也没有打印任何错误。如果我删除 locationManager(:didFailWithError) 方法，而不是开始工作，并且打印位置坐标，但 Xcode 还声称“委托(delegate)必须响应 locationManager:didFailWithError:我的代码有什么问题吗？

Answer 1

你需要做

let locManager = CLLocationManager()

一个实例变量来保存委托(delegate)的强引用，您也需要其中 1 个

locManager.startUpdatingLocation()
locManager.requestLocation()