获取 CBPeripheralManager 订阅的 Centrals

Posted 2023-03-05

【中文标题】获取 CBPeripheralManager 订阅的 Centrals

【英文标题】：Get CBPeripheralManager's Subscribed Centrals

【发布时间】：2014-10-26 23:39:34

【问题描述】：

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

有关服务的所有信息都已恢复，包括任何包含的服务、特征、特征描述符和订阅的中心。

从返回的CBMutableServices数组中，我可以循环访问服务，进而循环访问每个服务的特征。但是我不知道如何访问订阅的中心，有人可以帮忙吗？

下面是我使用的为局部变量等赋值的通用代码：

    - (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];
    

【参考方案1】：

您可以从CBMutableCharacteristic 对象中检索subscribed centrals -

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];
        

【讨论】：

完美。完全不知道我是如何在文档中错过的。当然，现在我已经看到了，我可以立即找到它！感谢您的帮助。