相关疑难解决方法(0)

是否可以将iOS 7设备作为蓝牙LE外设(iBeacon)运行并在后台进行广告宣传？我已经能够使用下面的代码在前台做广告,并且可以从另一个iOS设备看到它但是一旦我回到主屏幕就停止广告.我确实在plist中添加了蓝牙外设背景模式,但这似乎没有帮助,虽然我得到提示说该设备想要在后台使用蓝牙.我做错了什么,或者这在iOS 7中是不可能的？

peripManager = [[CBPeripheralManager alloc] initWithDelegate:self queue:nil];

- (void)peripheralManagerDidUpdateState:(CBPeripheralManager *)peripheral
{
  if (peripheral.state != CBPeripheralManagerStatePoweredOn) {
      return;
  }

  NSString *identifier = @"MyBeacon";
  //Construct the region
  CLBeaconRegion *beaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid identifier:identifier];

  //Passing nil will use the device default power
  NSDictionary *payload = [beaconRegion peripheralDataWithMeasuredPower:nil];

  //Start advertising
  [peripManager startAdvertising:payload];
}

这是接收/收听端的代码:

- (void)locationManager:(CLLocationManager *)manager didRangeBeacons:(NSArray *)beacons
           inRegion:(CLBeaconRegion *)region
{
//Check if we have moved closer or farther away from the iBeacon…
if (beacons.count > 0) {
    CLBeacon *beacon …

我正在使用这个BLE插件构建一个带有Xamarin的iOS应用程序:

https://github.com/aritchie/bluetoothle

我只是通过BLE播放UUID,它可以工作.这是我的代码:

var data = new Plugin.BluetoothLE.Server.AdvertisementData
            {
                LocalName = "MyServer",
            };

data.ServiceUuids.Add(new Guid("MY_UUID_HERE"));

await this.server.Start(data);

唯一的问题是,一旦我将应用程序放在后台,它就会停止广播.当我再次打开应用程序时再次恢复.

一旦它在后台,我怎么能让它继续播放？我在这里阅读文档:

https://developer.apple.com/library/content/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html

它说我必须使用CBCentralManager该类来获取保存和恢复功能(所以我可以随时继续广播UUID),但我很难将其转换为Xamarin/C#.

编辑

在研究了一些之后,我读到我需要在委托中创建一个实例CBCentralManager并实现WillRestoreState它.我是这样做的AppDelegate:

[Register("AppDelegate")]
public class AppDelegate : MvxApplicationDelegate, ICBCentralManagerDelegate
{
    private IGattServer server = CrossBleAdapter.Current.CreateGattServer();
    private CBCentralManager cbCentralManager;

    public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions)
    {
        // irrelevant code...

        this.Ble();

        return true;
    }

    private async Task Ble()
    {
        try
        {
            await Task.Delay(5000); // wait for it to finish initializing so I …