ios - 获取 CBPeripheralManager 订阅的 Central

Question

当实现 CBPeripheralManagerDelegate 方法 -peripheralManager:willRestoreState 时，字典中的对象传递给键 CBPeripheralManagerRestoredStateServicesKey Apple 的文档指出

All the information about a service is restored, including any included services, characteristics, characteristic descriptors, and subscribed centrals.

从返回的 CBMutableServices 数组中，我可以遍历服务并依次遍历每个服务的特征。但是我不知道如何访问订阅的中心，有人可以帮忙吗？

下面是我使用过的通用代码，它为局部变量等赋值:

    - (void)peripheralManager:(CBPeripheralManager *)peripheral willRestoreState:(NSDictionary *)dict
{
    advertisementData = dict[CBPeripheralManagerRestoredStateAdvertisementDataKey];

    NSArray *services = dict[CBPeripheralManagerRestoredStateServicesKey];

    for (CBMutableService *service in services) {

        mainService = service;

        for (CBMutableCharacteristic *charactristic in mainService.characteristics) {

            if ([charactristic.UUID.UUIDString isEqualToString:AUTH_UUID]) {

                authCharacteristic = charactristic;

            } else if ([charactristic.UUID.UUIDString isEqualToString:CENTRAL_NAME_UUID]) {

                receiveDeviceNameCharacteristic = charactristic;

            }
        }
        // How would I reinstantiate subscribed centrals?
        // subscribedCentrals = ?

        [manager addService:mainService];
    }
}

Answer 1

您可以检索 subscribed centrals来自 CBMutableCharacteristic 对象 -

所以，像-

NSMutableSet *centrals=[NSMutableSet new];

for (CBMutableCharacteristic *charactristic in mainService.characteristics) {

        if ([charactristic.UUID.UUIDString isEqualToString:AUTH_UUID]) {

            authCharacteristic = charactristic;

        } else if ([charactristic.UUID.UUIDString isEqualToString:CENTRAL_NAME_UUID]) {

            receiveDeviceNameCharacteristic = charactristic;

        }
        for (CBCentral *central in characteristic.subscribedCentrals) {
            [centrals addObject:central];
        }
}