如何让函数等待，直到使用Objective-C通过BLE接收到来自设备的ACK？

// 定义一个信号量
dispatch_semaphore_t semaphore = dispatch_semaphore_create(0);

// 发送数据给设备
[peripheral writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

// 等待ACK的回调
- (void)peripheral:(CBPeripheral *)peripheral didWriteValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error {
    if (error) {
        NSLog(@"发送数据失败：%@", error.localizedDescription);
    } else {
        NSLog(@"发送数据成功");
    }
    
    // 发送完数据后，发送信号量
    dispatch_semaphore_signal(semaphore);
}

// 等待函数
dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);