iOS CLLocationManager在一个单独的类中

Question

我有多个视图控制器需要获取用户的位置,所以我想创建一个单独的类,ViewControllers可以调用该类来获取用户的最新位置.

locationManager:didUpdateToLocation:fromLocation返回void.一旦计算出用户的纬度和经度,我如何将纬度和经度数据传回我的ViewControllers？

我可以尝试在我的locationManaging类中编写getter和setter,但是如果我这样做,我怎么知道何时从我的ViewController类中调用latitude getter和longitude getter方法？如何保持ViewController的主线程等待来自locationManaging类的纬度和经度值？

谢谢!

Answer 1

正如user1071136所说,单身人士的位置管理员可能就是你想要的.创建一个类,NSObject的子类,只有一个属性,a CLLocationManager.

LocationManagerSingleton.h:

#import <MapKit/MapKit.h>

@interface LocationManagerSingleton : NSObject <CLLocationManagerDelegate>

@property (nonatomic, strong) CLLocationManager* locationManager;

+ (LocationManagerSingleton*)sharedSingleton;

@end

LocationManagerSingleton.m:

#import "LocationManagerSingleton.h"

@implementation LocationManagerSingleton

@synthesize locationManager;

- (id)init {
    self = [super init];

    if(self) {
        self.locationManager = [CLLocationManager new];
        [self.locationManager setDelegate:self];
        [self.locationManager setDistanceFilter:kCLDistanceFilterNone];
        [self.locationManager setHeadingFilter:kCLHeadingFilterNone];
        [self.locationManager startUpdatingLocation];
        //do any more customization to your location manager
    }

    return self;
}    

+ (LocationManagerSingleton*)sharedSingleton {
    static LocationManagerSingleton* sharedSingleton;
    if(!sharedSingleton) {
        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            sharedSingleton = [LocationManagerSingleton new];
        }
    }

    return sharedSingleton;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    //handle your location updates here
}

- (void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading {
    //handle your heading updates here- I would suggest only handling the nth update, because they
    //come in fast and furious and it takes a lot of processing power to handle all of them
}

@end

要获取最近收到的位置,只需使用[LocationManagerSingleton sharedSingleton].locationManager.location.可能需要几秒钟来预热GPS以获得准确的位置.

Answer 2

创建一个具有latitude和longitude属性的单例类,startLocating和endLocating.在类中,创建一个CLLocationManager实例,并将其委托设置为单例.在startLocating和中endLocating,调用CLLocationManager实例的相应方法.使委托方法更新latitude和longitude属性.在其他方面ViewControllers,阅读这个单身人士latitude和longitude属性.

要知道何时从另一个属性读取这些属性ViewController,请在这些属性上设置观察者(请参阅NSKeyValueObserving协议参考

在此之前,请查找Internets以获取现有代码.

执行此操作后,使用许可许可证将其上载到GitHub.

Answer 3

根据上面的答案,这就是我所做的,你可以在github上找到完整的例子https://github.com/irfanlone/CLLocationManager-Singleton-Swift

只需在项目中导入此文件,然后您可以选择实施LocationUpdateProtocol或收听位置更新通知

import MapKit

protocol LocationUpdateProtocol {
    func locationDidUpdateToLocation(location : CLLocation)
}

/// Notification on update of location. UserInfo contains CLLocation for key "location"
let kLocationDidChangeNotification = "LocationDidChangeNotification"

class UserLocationManager: NSObject, CLLocationManagerDelegate {

    static let SharedManager = UserLocationManager()

    private var locationManager = CLLocationManager()

    var currentLocation : CLLocation?

    var delegate : LocationUpdateProtocol!

    private override init () {
        super.init()
        self.locationManager.delegate = self
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest
        self.locationManager.distanceFilter = kCLLocationAccuracyHundredMeters
        locationManager.requestAlwaysAuthorization()
        self.locationManager.startUpdatingLocation()
    }

    // MARK: - CLLocationManagerDelegate

    func locationManager(manager: CLLocationManager, didUpdateToLocation newLocation: CLLocation, fromLocation oldLocation: CLLocation) {
        currentLocation = newLocation
        let userInfo : NSDictionary = ["location" : currentLocation!]

        dispatch_async(dispatch_get_main_queue()) { () -> Void in
            self.delegate.locationDidUpdateToLocation(self.currentLocation!)
            NSNotificationCenter.defaultCenter().postNotificationName(kLocationDidChangeNotification, object: self, userInfo: userInfo as [NSObject : AnyObject])
        }
    }

}

用法:

class ViewController: UIViewController, LocationUpdateProtocol {

    var currentLocation : CLLocation!

    override func viewDidLoad() {
        super.viewDidLoad()

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "locationUpdateNotification:", name: kLocationDidChangeNotification, object: nil)

        let LocationMgr = UserLocationManager.SharedManager
        LocationMgr.delegate = self

    }

    // MARK: - Notifications

    func locationUpdateNotification(notification: NSNotification) {
        let userinfo = notification.userInfo
        self.currentLocation = userinfo!["location"] as! CLLocation
        print("Latitude : \(self.currentLocation.coordinate.latitude)")
        print("Longitude : \(self.currentLocation.coordinate.longitude)")

    }

    // MARK: - LocationUpdateProtocol

    func locationDidUpdateToLocation(location: CLLocation) {
        currentLocation = location
        print("Latitude : \(self.currentLocation.coordinate.latitude)")
        print("Longitude : \(self.currentLocation.coordinate.longitude)")
    }

}