iOS8和BTLE | CBCentralManager无法找到外围设备

Question

我有一个使用BTLE连接到设备(arduino)的iOS应用程序.我的iPad iOS 7上的一切正常.升级到iOS 8后,CBCentralManager找不到任何外围设备.

- (void)startScanningForSupportedUUIDs
{
   [self.centralManager scanForPeripheralsWithServices:nil options:nil];

}

我不知道会出现什么问题.

Answer 1

我有解决方案,出于某种原因,在iOS 8中实例化你的CBManager后有一些延迟.您需要在CBCentralManager启用时开始扫描,在此方法中:

-(void)centralManagerDidUpdateState:(CBCentralManager *)central{
switch (central.state) {
    case CBCentralManagerStatePoweredOff:
        NSLog(@"CoreBluetooth BLE hardware is powered off");
        break;
    case CBCentralManagerStatePoweredOn:
    {
        NSLog(@"CoreBluetooth BLE hardware is powered on and ready");
        NSArray         *uuidArray  = [NSArray arrayWithObjects:[CBUUID UUIDWithString:TRANSFER_SERVICE_UUID], nil];
        NSDictionary    *options    = [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBCentralManagerScanOptionAllowDuplicatesKey];
        [centralManager scanForPeripheralsWithServices:uuidArray options:options];
    }
        break;
    case CBCentralManagerStateResetting:
        NSLog(@"CoreBluetooth BLE hardware is resetting");
        break;
    case CBCentralManagerStateUnauthorized:
        NSLog(@"CoreBluetooth BLE state is unauthorized");
        break;
    case CBCentralManagerStateUnknown:
        NSLog(@"CoreBluetooth BLE state is unknown");
        break;
    case CBCentralManagerStateUnsupported:
        NSLog(@"CoreBluetooth BLE hardware is unsupported on this platform");
        break;
    default:
        break;
}