iOS8和BTLE | CBCentralManager无法找到外围设备 [英] iOS8 and BTLE | CBCentralManager unable to find peripherals

问题描述

我有一个使用BTLE连接到设备（arduino）的iOS应用。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。

I have an iOS app that is connecting to a device (arduino) using a BTLE. Everything is working fine on my iPad iOS 7. After upgrading to iOS 8, the CBCentralManager is not finding any peripherals.

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

}

我不知道会出现什么问题。

I don't know what can be the problem.

推荐答案

我有解决方案，因为某些原因在iOS 8中实例化CBManager后会有一些延迟。您需要在CBCentralManager打开时开始扫描，在此方法中：

I have the solution, for some reason in iOS 8 there is some delay after instantiate your CBManager. You need to start to scan when the CBCentralManager is on, in this method:

-(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;
}

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