在 iOS 上最小化 cordova 应用程序后 EAAccessory 停止答案

【问题标题】：EAAccessory stops after cordova application is minimized on iOS在 iOS 上最小化 cordova 应用程序后 EAAccessory 停止
【发布时间】：2015-11-26 17:41:59
【问题描述】：

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（未最小化）时，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 中看到了以下内容：

2015-11-26 12:24:13.944 MyAppName[704:170849] /SourceCache/ExternalAccessory/ExternalAccessory-288.20.7/EAAccessoryManager.m:__51-[EAAccessoryManager _checkForConnectedAccessories]_block_invoke-631 结束后台任务

我也尝试使用下面的代码实现附件DidConnect 和附件DidDisconnect，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;
}

pluginInitialize 函数被调用，但从不调用accessoryDidConnect 或accessoryDidDisconnect。如何重新连接蓝牙阅读器？

【问题讨论】：

标签： ios cordova bluetooth eaaccessory

【解决方案1】：

我让它工作了。我的插件中缺少以下最后一行：

[[EAAccessoryManager sharedAccessoryManager] registerForLocalNotifications];

这里又是完整的方法：

- (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];

}

【讨论】：