快速查找 iPhone 的指南针方向

Posted 2023-02-16

【中文标题】快速查找 iPhone 的指南针方向

【英文标题】：Finding the compass orientation of an iPhone in swift

【发布时间】：2015-08-22 15:56:45

【问题描述】：

我正在尝试制作一个类似于指南针的应用程序，但有显着差异，但它们并不重要。我需要知道的是：无论手机的方向如何，我如何让 iPhone 给我指南针方向（即北方为 0 度）（即，如果它平放在桌子上或肖像中，它会给出相同的读数某人的手，如果它指向相同的方向）

TL;DR 我怎样才能让 iPhone 绕 y 轴旋转大约每秒更新一次。

【参考方案1】：

import CoreLocation

class ViewController: UIViewController ,CLLocationManagerDelegate 

    var lm:CLLocationManager!

    override func viewDidLoad() 
        super.viewDidLoad()

        lm = CLLocationManager()
        lm.delegate = self

        lm.startUpdatingHeading()
    

    override func didReceiveMemoryWarning() 
        super.didReceiveMemoryWarning()
    

    func locationManager(manager: CLLocationManager!, didUpdateHeading newHeading: CLHeading!) 
        println(newHeading.magneticHeading)
    

您可以从https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLHeading_Class/获取更多信息

【讨论】：

我在 sim 和设备上都试过了，但我无法显示任何标题值。我把它绑在一个标签上，当我在外面走动时应该更新。有什么想法吗？

很好的答案，但我想不出实现didReceiveMemoryWarning() 的理由，只需调用super — 我的意思是，这是默认行为。

【参考方案2】：

斯威夫特 3：

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate 

    let locationManager = CLLocationManager()

    override func viewDidLoad() 
        super.viewDidLoad()

       // Azimuth
        if (CLLocationManager.headingAvailable()) 
            locationManager.headingFilter = 1
            locationManager.startUpdatingHeading()
            locationManager.delegate = self
        
    

    func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) 
        print (heading.magneticHeading)
    

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

【讨论】：

我的代码与您在我的应用程序中显示的完全一样，但在打开位置路径的模拟器中，我从未打印出任何标题

模拟器不支持磁航向，在真机上试试。

【参考方案3】：

Swift 3.0

    import UIKit
    import CoreLocation

    class ViewController: UIViewController, CLLocationManagerDelegate 

    @IBOutlet weak var compass: UIImageView!
    @IBOutlet weak var angleLabel: UILabel!
    @IBOutlet weak var geographicalDirectionLabel: UILabel!

    var locationManager = CLLocationManager()

    override func viewDidLoad() 

        super.viewDidLoad()


        locationManager.delegate = self

        // Start location services to get the true heading.
        locationManager.distanceFilter = 1000
        locationManager.desiredAccuracy = kCLLocationAccuracyKilometer
        locationManager.startUpdatingLocation()

        //Start heading updating.
        if CLLocationManager.headingAvailable() 
            locationManager.headingFilter = 5
            locationManager.startUpdatingHeading()
        




    

    func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) 

        if newHeading.headingAccuracy < 0 
            return
        

        // Get the heading(direction)
        let heading: CLLocationDirection = ((newHeading.trueHeading > 0) ?
            newHeading.trueHeading : newHeading.magneticHeading);
        UIView.animate(withDuration: 0.5) 
            let angle = CGFloat(heading).toRadians // convert from degrees to radians
            self.compass.transform = CGAffineTransform(rotationAngle: angle) // rotate the picture
        
        print(heading)
        angleLabel.text = String(format: "%0.2f", heading)

       var strDirection = String()
        if(heading > 23 && heading <= 67)
            strDirection = "North East";
         else if(heading > 68 && heading <= 112)
            strDirection = "East";
         else if(heading > 113 && heading <= 167)
            strDirection = "South East";
         else if(heading > 168 && heading <= 202)
            strDirection = "South";
         else if(heading > 203 && heading <= 247)
            strDirection = "South West";
         else if(heading > 248 && heading <= 293)
            strDirection = "West";
         else if(heading > 294 && heading <= 337)
            strDirection = "North West";
         else if(heading >= 338 || heading <= 22)
            strDirection = "North";
        

        geographicalDirectionLabel.text = strDirection
    
  

【讨论】：

感谢您的回答，trueHeading 是否提供与北方相关的实际价值？