最小的iOS蓝牙示例 [英] Minimal iOS BluetoothManager Example

问题描述

我一直在构建一个使用iOS 5.0中的BluetoothManager私有框架检测附近蓝牙设备的最小示例。

I've been constructing a minimal example for detecting nearby Bluetooth devices using the BluetoothManager private framework in iOS 5.0.

使用此问题中的答案：查找触手可及的通用蓝牙设备

Using an answer found in this question: Finding generic Bluetooth devices within reach

这是我的viewDidLoad方法，用于注册BluetoothAvailabilityChangedNotification。我也注册了BluetoothDeviceDiscoveredNotification。

Here's my viewDidLoad method to register for the BluetoothAvailabilityChangedNotification. I also register for the BluetoothDeviceDiscoveredNotification as well.

[[NSNotificationCenter defaultCenter]
    addObserver:self
    selector:@selector(bluetoothAvailabilityChanged:)
    name:@"BluetoothAvailabilityChangedNotification"
    object:nil];

btCont = [BluetoothManager sharedInstance];

[[NSNotificationCenter defaultCenter]
    addObserver:self
    selector:@selector(deviceDiscovered:)
    name:@"BluetoothDeviceDiscoveredNotification"
    object:nil];

当我获得蓝牙可用性更改通知时，我设置了设备扫描功能，如下所示上述链接中的答案。

When I get the Bluetooth availability changed notification, I set the device scanning enabled, as outlined in one of the answers in the aforementioned link.

- (void)bluetoothAvailabilityChanged:(NSNotification *)notification
{
    NSLog(@"BT State: %d", [btCont enabled]);
    [btCont setDeviceScanningEnabled:YES];
}

为了完整性，这里是deviceDiscovered通知方法。

For completeness, here's the deviceDiscovered notification method.

- (void)deviceDiscovered:(NSNotification *) notification
{
    NSLog(@"Discovered one!");
}

运行测试应用程序生成的日志如下：

The logs produced by running the test application are as follows:

BTM: attaching to BTServer
BTM: posting notification BluetoothAvailabilityChangedNotification
BT State: 1
BTM: setting device scanning enabled

不幸的是，手机根本没有拿起任何蓝牙设备，即使我知道有近似的可发现设备（使用Android设备验证）。

Unfortunately, the phone isn't picking up any Bluetooth devices at all, even though I know there are proximate discoverable devices (verified using an Android device).

我已经尝试了一些事情：

Some things I have tried already:

• 调用[btCont setPowered：YES];并注册相关的电源状态变化通知，在回调中执行setDeviceScanningEnabled：YES


• 在setDeviceScanningEnabled调用之前调用[btCont resetDeviceScanning]


• 调用scanForConnectableDevices :( unsigned int）arg1;方法，猜测arg1可能是某种超时值。我尝试了各种各样的价值但没有成功。

任何想法都会非常感激。
谢谢！

Any thoughts would be much appreciated. Thanks!

推荐答案

据我所知，蓝牙管理器在操作系统筛选结果后获取列表。
您只能获得附近的耳机设备，而不是所有通用设备。

As far as I know, the bluetooth manager gets the list after OS has filtered the results. You will only get the nearby headset devices and not all generic devices.

您必须使用scanForServices：

you have to use scanForServices:

    // start scan
    [btManager  setDeviceScanningEnabled:YES];
    [btManager scanForServices:0xFFFFFFFF];

这篇关于最小的iOS蓝牙示例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！