ios - 关闭再打开后如何在后台重新连接BLE设备？

Question

我正在做一个与 BLE 相关的小项目。我有一个要求，我需要在手动关闭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（< iOS 7 的 UUID），检索外围设备，并在 centralManager 将状态更新为已打开时调用 connect 。

对于 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];
            }
        }
    }

对于 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：这些只是代码片段。当您获得该更新时，您还应该监视CBCentralManagerStatePoweredOff（以及其他）并取消所有当前的外围设备连接。