xcode EAAccessoryManager connectedAccessories 返回空数组
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EAAccessoryManager connectedAccessories returns empty array
提问by Arun Kumar Munusamy
I am using EAAccessoryManager to connect my application to a MFI accessory. During the initial connection, in bluetooth setting screen, it showing as device connected.
我正在使用 EAAccessoryManager 将我的应用程序连接到 MFI 附件。在初始连接期间，在蓝牙设置屏幕中，它显示为设备已连接。
When i try to get the list of connected device using
[accessoryManager connectedAccessories], it returns a empty array. But when i use showBluetoothAccessoryPickerWithNameFilter, it shows me the accessory in the list.
当我尝试使用 获取已连接设备的列表时
[accessoryManager connectedAccessories]，它返回一个空数组。但是当我使用时showBluetoothAccessoryPickerWithNameFilter，它会向我显示列表中的配件。
The problem is i don't want user to choose the accessory. I want to make this a automated process. I have included the accessory protocol string in info.plist too. Please guide me with this issue. What mistake i am doing here ?
问题是我不希望用户选择配件。我想让它成为一个自动化的过程。我也在 info.plist 中包含了附件协议字符串。请指导我解决这个问题。我在这里犯了什么错误？
回答by Markus Schneider
I had the same issue and was able to resolve it by adding a Supported external accessory protocolskey to my info.plistfile (raw key name is UISupportedExternalAccessoryProtocols). In my case, I wanted to scan for connected PayPal™ credit card terminals and Zebra™ printers. Here's the corresponding extract from my info.plist:
我遇到了同样的问题，并且能够通过Supported external accessory protocols在我的info.plist文件中添加一个密钥来解决它（原始密钥名称是UISupportedExternalAccessoryProtocols）。就我而言，我想扫描连接的 PayPal™ 信用卡终端和 Zebra™ 打印机。这是我的 info.plist 的相应摘录：
<key>UISupportedExternalAccessoryProtocols</key>
<array>
<string>com.paypal.here.reader</string>
<string>com.zebra.rawport</string>
</array>
Once I added these, connectedAccessorieswas populated.
一旦我添加了这些，就会connectedAccessories被填充。
回答by Massimo Polimeni
Could you try this function?
你可以试试这个功能吗？
- (void)_getAttachedDevices;
{
EAAccessoryManager* accessoryManager = [EAAccessoryManager sharedAccessoryManager];
if (accessoryManager)
{
NSArray* connectedAccessories = [accessoryManager connectedAccessories];
NSLog(@"ConnectedAccessories = %@", connectedAccessories);
}
else
{
NSLog(@"No accessoryManager");
}
}
Which result do you get?
你得到哪个结果？
Obviously remember that EAAccessoryis only for the Made-For-iPod/iPhone/iPad/AirPlay licensed accessories; so if you have no licensed accessory you'll see always an empty array. Do you have a regular licensed MFI accessory?
显然请记住，EAAccessory仅适用于 Made-For-iPod/iPhone/iPad/AirPlay 许可的配件；因此，如果您没有获得许可的配件，您将始终看到一个空数组。您有常规许可的 MFI 配件吗？
In addiction I suggest if you haven't read it yet the Apple Documentation.
如果您还没有阅读Apple 文档，我建议您上瘾。
EDIT 1:
编辑 1：
If you are still stuck try to implement the notification for connect/disconnect:
如果您仍然卡住，请尝试实现连接/断开连接的通知：
[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(accessoryDidConnect:)
name:EAAccessoryDidConnectNotification
object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(accessoryDidDisconnect:)
name:EAAccessoryDidDisconnectNotification
object:nil];
Do you see the connection for your device? If yes try to get the list of connected devices on
您看到设备的连接了吗？如果是，请尝试获取已连接设备的列表
accessoryDidConnect
附件DidConnect
