如何检测iphone是否连接到任何蓝牙设备？ [英] How to detect if a iphone is connected to any bluetooth device or not?

问题描述

我在iOS 7中遇到了这个新API。

I came across this new API from iOS 7.

- (NSArray *)retrieveConnectedPeripheralsWithServices:(NSArray *)serviceUUIDs NS_AVAILABLE(NA, 7_0);

所以很明显，如果返回数组的数量大于0，则连接到至少一个设备。
但是在使用这个API之前，我无法弄清楚我必须在这里传递的参数（serviceUUIDs）。
有人可以在这里用一个例子来解释吗？

So its pretty clear that if the return array count is greater than 0 than its connected to atleast one device. But before using this API I am not able to figure it out the argument (serviceUUIDs) that I have to passed here. Can someone explain here with an example?

推荐答案

除非你至少知道一个，否则你不能使用这个方法设备暴露的服务。您可以尝试使用常见服务，例如设备信息 - 0x180A - 因为大多数BLE设备都会宣传此服务，但不能保证。

You can't use this method unless you know at least one service exposed by the device. You could try using a common service, such as Device Information - 0x180A - as most BLE devices will advertise this service but it is not guaranteed.

CBUUID *deviceInfoUUID = [CBUUID UUIDWithString: @"180A"];
[cbCentral retrieveConnectedPeripheralsWithServices:@[deviceInfoUUID]];

传统音频设备（耳机，A2DP设备等）通过音频会话类作为音频设备可见 -

Legacy audio devices (headsets, A2DP devices etc) are visible as audio devices through the audio session classes -

检测连接的音频设备iOS

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