Xamarin 后台持续定位与提示

IOS后台持续运行对于c#程序员不懂得ios后台机制的是存在一定困扰的。特别是ios9过后对后台和安全进行了更严格的限制

好了废话不多说

一设置info.plist权限信息

参考：

后台模式：http://www.codeceo.com/article/ios-background-guide.html

后台持续定位：http://www.jianshu.com/p/4e30b0af8f51

播放声音：http://www.jianshu.com/p/e54751348abe

需要开启后台运行模式：勾选位置更新，音频播放

二关键代码

2.1 设置

 coo.DistanceFilter = -;//设置两点之间位置精度，即手机不动也会提示

 coo.DesiredAccuracy = CLLocation.AccuracyBest;

 coo.AllowsBackgroundLocationUpdates = true;//开启后台持续定位

 coo.PausesLocationUpdatesAutomatically = false;//禁用后台暂停位置更新

 coo.Delegate = this;

 coo.RequestAlwaysAuthorization();

 coo.StartUpdatingLocation();

 coo.StartUpdatingHeading();

2.2 前后台切换

        public override void DidEnterBackground(UIApplication uiApplication)

        {
　　　　　　　//进入后台

            DependencyService.Get<ILocationManager>().EnterBackground();

        }

        public override void WillEnterForeground(UIApplication uiApplication)

        {
　　　　　　　//进入前台

            DependencyService.Get<ILocationManager>().EnterForground();

        }

三播放音频(系统提示音)

var sound = new SystemSound();

await sound.PlaySystemSoundAsync();

四实现结果

当位置发生更新时播放系统提示音，且伴有震动，这里暂时对ios消息推送不甚了解，下次将在位置更新播放提示音同时加入本地推送

这里是使用xamarin.ios 原生api实现，之前试过百度地图持续最新sdk弄了半天进入后台就不行了，也许是我知识不够，但是使用原生api也行那么也就不用那么麻烦了

五完整代码

[assembly: Dependency(typeof(MyLocationManager))]

namespace Xamarin.Simples.iOS

{

    public class MyLocationManager : NSObject, ICLLocationManagerDelegate, ILocationManager

    {

        private CLLocationManager coo;

        private bool init = false;

        public MyLocationManager()

        {

            coo = new CLLocationManager();

        }

        #region ICLLocationManagerDelegate

        #region IDisposable implementation

        void IDisposable.Dispose()

        {

            throw new NotImplementedException();

        }

        #endregion

        #region INativeObject implementation

        IntPtr ObjCRuntime.INativeObject.Handle

        {

            get

            {

                throw new NotImplementedException();

            }

        }

        #endregion

        [Foundation.Export("locationManager:didUpdateLocations:")]

        public async void LocationsUpdated(CoreLocation.CLLocationManager manager, CoreLocation.CLLocation[] locations)

        {

            Console.WriteLine("定位成功");

            var sound = new SystemSound();

            await sound.PlaySystemSoundAsync();

        }

        [Export("locationManager:didUpdateHeading:")]

        public void UpdatedHeading(CoreLocation.CLLocationManager manager, CoreLocation.CLHeading newHeading)

        {

        }

        [Foundation.Export("locationManager:didUpdateToLocation:fromLocation:")]

        public void UpdatedLocation(CoreLocation.CLLocationManager manager, CoreLocation.CLLocation newLocation, CoreLocation.CLLocation oldLocation)

        {

        }

        #endregion

        public void Init()

        {

            if (!init)

            {

                coo.DistanceFilter = -;

                coo.DesiredAccuracy = CLLocation.AccuracyBest;

                coo.AllowsBackgroundLocationUpdates = true;

                coo.PausesLocationUpdatesAutomatically = false;

                coo.Delegate = this;

                coo.RequestAlwaysAuthorization();

                coo.StartUpdatingLocation();

                coo.StartUpdatingHeading();

                init = true;

            }

        }

        public void EnterBackground()

        {

            if (init)

                coo.StartMonitoringSignificantLocationChanges();

        }

        public void EnterForground()

        {

            if (init)

                coo.StopMonitoringSignificantLocationChanges();

        }

    }

}

六案例下载

https://yunpan.cn/cqegpGW96nYx7 （提取码：4508）

巴特西

Xamarin 后台持续定位与提示

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