ios - 在 iOS 上最小化 cordova 应用程序后 EAAccessory 停止

Question

我正在构建一个连接到蓝牙阅读器的 cordova 应用程序。当应用程序运行时(未最小化)一切正常。我能够读取蓝牙数据。如果我现在最小化应用程序然后再次最大化它(不确定这是否是正确的术语)，那么我将无法再接收任何数据。我确实在 XCode 中看到以下内容:

2015-11-26 12:24:13.944 MyAppName[704:170849] /SourceCache/ExternalAccessory/ExternalAccessory-288.20.7/EAAccessoryManager.m:__51-[EAAccessoryManager _checkForConnectedAccessories]_block_invoke-631 ending background task

我还尝试使用下面的代码实现 accessoryDidConnect 和 accessoryDidDisconnect，但是这两个函数都没有被调用:

- (void) pluginInitialize
{
    NSLog(@"init called");
    [[NSNotificationCenter defaultCenter] addObserver:selfselector:@selector(accessoryDidConnect:)
                                                 name:EAAccessoryDidConnectNotification
                                               object:nil];


    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(accessoryDidDisconnect:)
                                                 name:EAAccessoryDidDisconnectNotification object:nil];
}

-(void) accessoryDidConnect:(NSNotification *)notification
{
    EAAccessory *connectedAccessory = [[notification userInfo] objectForKey:EAAccessoryKey];
    NSLog(@"error :%@", connectedAccessory.protocolStrings);
    // Only notify of change if the accessory added has valid protocol strings
    if( connectedAccessory.protocolStrings.count != 0 )
    {
        _accessoryList = [[[EAAccessoryManager sharedAccessoryManager] connectedAccessories] mutableCopy];
    }
    NSLog(@"connected");
    isDeviceLoaded=true;
}

- (void)accessoryDidDisconnect:(NSNotification *)notification
{
    //    EAAccessory *disconnectedAccessory = (EAAccessory *)[notification.userInfo objectForKey:@"EAAccessorySelectedKey"];
    NSLog(@"disconnected");
    _accessoryList = [[[EAAccessoryManager sharedAccessoryManager] connectedAccessories]mutableCopy];
    isDeviceLoaded=true;
}

调用了 pluginInitialize 函数，但从未调用 accessoryDidConnect 或 accessoryDidDisconnect。如何重新连接到蓝牙阅读器？

Answer 1

我成功了。我的插件中缺少以下最后一行:

[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];

这里是完整的方法:

- (void) pluginInitialize
{
    NSLog(@"init called");
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(accessoryDidConnect:)
                                                 name:EAAccessoryDidConnectNotification
                                               object:nil];


    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(accessoryDidDisconnect:)
                                                 name:EAAccessoryDidDisconnectNotification
                                               object:nil];

    [[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];

}