Question

我正在开发一款应用程序，可以对外围设备的断开做出反应，我现在正在尝试采用iOS 7中引入的ne状态保存和恢复。

我做的就像文档说的那样，意思是：

我为中心添加了背景模式。
我总是使用相同的唯一实例化我的中央管理器标识符。
我实施了centralManager:willRestoreState:方法。

当我的应用程序移动到后台时，我使用kill(getpid(), SIGKILL);在AppDelegate回调中将其杀死。（Core Bluetooth State Preservation and Restoration Not Working, Can't relaunch app into background）

当我现在通过取出电池断开外围设备时，我的应用程序正在按预期唤醒，launchOptions[UIApplicationLaunchOptionsBluetoothCentralsKey]包含正确的标识符但未调用centralManager:willRestoreState:。只有当我断开另一个外围设备时，才会调用此方法。

Answer 1

我就是这样：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{

    NSArray *peripheralManagerIdentifiers = launchOptions[UIApplicationLaunchOptionsBluetoothPeripheralsKey];

    if (peripheralManagerIdentifiers) {

        // We've restored, so create the _manager on the main queue
        _manager = [[CBPeripheralManager alloc] initWithDelegate:self
                                                          queue:dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
                                                        options:@{CBPeripheralManagerOptionRestoreIdentifierKey:@"YourUniqueIdentifier"}];

    } else {

        // Not restored so just create as normal
        manager = [[CBPeripheralManager alloc] initWithDelegate:self
                                                          queue:nil
                                                        options:@{CBPeripheralManagerOptionRestoreIdentifierKey:@"YourUniqueIdentifier"}];

    }
return YES;
}

然后：

- (void)peripheralManager:(CBPeripheralManager *)peripheral
         willRestoreState:(NSDictionary *)dict
{


    // This is the advertisement data that was being advertised when the app was terminated by iOS
    _advertisementData = dict[CBPeripheralManagerRestoredStateAdvertisementDataKey];

    NSArray *services = dict[CBPeripheralManagerRestoredStateServicesKey];

    // Loop through the services, I only have one service but if you have more you'll need to check against the UUID strings of each
    for (CBMutableService *service in services) {

        _primaryService = service;

        // Loop through the characteristics
        for (CBMutableCharacteristic *characteristic in _primaryService.characteristics) {

            if ([characteristic.UUID.UUIDString isEqualToString:CHARACTERISTIC_UUID]) {

                _primaryCharacteristic = characteristic;

                NSArray *subscribedCentrals = characteristic.subscribedCentrals;

                // Loop through all centrals that were subscribed when the app was terminated by iOS
                for (CBCentral *central in subscribedCentrals) {

                    // Add them to an array
                    [_centrals addObject:central];

                }
            }
        }
    }
}

核心蓝牙状态恢复

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