如何在关闭然后再打开后在后台重新连接BLE设备？

Question

我正在开展一个与BLE相关的小项目。我要求我需要在手动关闭之后在后台重新连接设备，然后从iPhone->设置 - >蓝牙关闭蓝牙。

Answer 1

只需存储外围设备标识符或（＆lt; iOS 7的UUID），检索外围设备，并在centralManager更新状态为启动时调用其上的连接。

适用于iOS 7：

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
    {
        if(central.state == CBCentralManagerStatePoweredOn)
        {
            NSUUID *uuid = [[NSUUID alloc]initWithUUIDString:savedUUID];//where savedUUID is the string version of the NSUUID you've saved somewhere

            NSArray *peripherals = [_cbCentralManager retrievePeripheralsWithIdentifiers:@[uuid]];

            for(CBPeripheral *periph in peripherals)
            {
                [_cbCentralManager connectPeripheral:periph options:nil];
            }
        }
    }

适用于iOS 6：

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
    {
        if(central.state == CBCentralManagerStatePoweredOn)
        {
            CFUUIDRef uuid;//the cfuuidref you've previously saved
            [central retrievePeripherals:@[(id)uuid]];//now wait for the delegate callback below
        }
    }

    - (void)centralManager:(CBCentralManager *)central didRetrievePeripherals:(NSArray *)peripherals
    {
        for(CBPeripheral *periph in peripherals)
        {
            [_centralManager connectPeripheral:periph options:nil];
        }
    }

注意：这些只是代码段。您还应该监视CBCentralManagerStatePoweredOff（以及其他）并在获得更新时取消所有当前的外围设备连接。