EAAccessory在科多瓦应用程序在iOS上最小化后停止

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，所有东西都在工作，查找(而不是最小化)。我能读到蓝牙数据。如果我现在最小化应用程序，然后再最大化它(不确定这是否是正确的术语)，那么我就不能再接收任何数据了。我在XCode中确实看到了以下内容：

2015年-11-26 12:24:13.944 MyAppName704:170849 /SourceCache/ExternalAccessory/ExternalAccessory-288.20.7/EAAccessoryManager.m:__51-EAAccessoryManager _checkForConnectedAccessories_block_invoke-631结束后台任务

我还尝试使用以下代码实现accessoryDidConnect和accessoryDidDisconnect，但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pluginInitialize函数，但从不调用accessoryDidConnect或accessoryDidDisconnect。我如何重新连接到蓝牙阅读器？

Answer 1

我让它起作用了。我错过了插件中的最后一行：

[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];

下面是完整的方法：

- (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];

}