快速查找iPhone的指南针方向
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我正在尝试制作一个类似指南针的应用程序,但是虽然有明显的差异,但它们并不重要。我需要知道的是:无论手机的方向如何,我怎样才能让iPhone给我罗盘方向(即北方0度)(即如果它平躺在桌子或肖像上,它会给出相同的读数。某人的手,如果指向相同的方式)
TL; DR如何围绕y轴获得iPhone的旋转,每秒左右更新一次。
答案
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/获得更多信息
另一答案
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.
}
}
另一答案
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
}
}
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