ios - 无法下标索引类型为 int 的 [CLPlacemark] 类型的值

Question

我想检索当前位置。我在 swift Xcode 7 上工作。我看了 PLUSIEUR 教程，但每次他们都使用相同的方法。这是我的代码和我的错误:!

Error : Cannot subscript a value of type [CLPlacemark] with an index type int

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    let LocationManager = CLLocationManager()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    self.LocationManager.delegate = self
    self.LocationManager.desiredAccuracy = kCLLocationAccuracyBest
    self.LocationManager.requestWhenInUseAuthorization()
    self.LocationManager.startUpdatingLocation()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}



func locationManager(manager: CLLocationManager, didUpdateLocations locations: [AnyObject]) {
    CLGeocoder().reverseGeocodeLocation(manager.location!, completionHandler: { (placemarks, error) -> Void in

        if (error != nil) {
            print("Error")
            return
        }

        if placemarks!.count > 0 {
            let pm = placemarks[0] as CLPlacemark
            self.displayLocationInfo(pm)
        }
        else {
            print("errorData")
        }

    })
}

func displayLocationInfo(placemark: CLPlacemark){
    self.LocationManager.stopUpdatingLocation()

    print(placemark.locality)
    print(placemark.postalCode)
    print(placemark.administrativeArea)
    print(placemark.country)
}

func locationManager(manager: CLLocationManager, didFailWithError error: NSError) {
    print("Error:" + error.localizedDescription)

    }
}

Answer 1

不，在 Xcode 7 中错误是:

error: cannot subscript a value of type '[CLPlacemark]?' with an index of type 'Int'

注意 ?。你必须打开那个可选的。所以你可以替换:

if placemarks!.count > 0 {
    let placemark = placemarks[0] as CLPlacemark
    self.displayLocationInfo(placemark)
}

与:

if let placemark = placemarks?.first {
    self.displayLocationInfo(placemark)
}